CN116260545A - Ultrashort pulse source for dense wavelength division multiplexing system - Google Patents
Ultrashort pulse source for dense wavelength division multiplexing system Download PDFInfo
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- CN116260545A CN116260545A CN202310013632.0A CN202310013632A CN116260545A CN 116260545 A CN116260545 A CN 116260545A CN 202310013632 A CN202310013632 A CN 202310013632A CN 116260545 A CN116260545 A CN 116260545A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/508—Pulse generation, e.g. generation of solitons
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/524—Pulse modulation
Abstract
The invention relates to an ultrashort pulse source for a dense wavelength division multiplexing system, which belongs to the technical field of optoelectronic equipment, and has the structure that: the output end of the seed pulse source (1) is connected with the input end of the pulse width widening module (2), the output end of the pulse width widening module (2) is connected with the input end of the pulse picking module (3), the output end of the pulse picking module (3) is connected with the input end of the pulse time domain segmentation module (4), the output end of the pulse time domain segmentation module (4) is connected with the input end of the primary pulse width compression module (5), the output end of the primary pulse width compression module (5) is connected with the input end of the polarized pulse coherent superposition module (6), and the output end of the polarized pulse coherent superposition module (6) is connected with the input end of the second-order pulse width compression module (7). The invention has the advantages of high output pulse energy, high power, ultra-short pulse width, multi-wavelength output and the like.
Description
Technical Field
The invention belongs to the technical field of optoelectronic equipment, and particularly relates to an ultrashort pulse source for a dense wavelength division multiplexing system.
Background
The requirements of various novel services on network bandwidth and reliability are higher and higher, and the characteristics of super-large capacity, super-long distance transmission, stable performance and the like of the dense wavelength division multiplexing system enable the importance of the dense wavelength division multiplexing system in the development of the Internet to be more prominent, and the dense wavelength division multiplexing system is still an important basic supporting platform for the development of the Internet in the future. In addition, the dense wavelength division multiplexing technology can greatly improve the capacity of the optical fiber communication system, is the most economical and effective way for realizing the upgrading and capacity expansion of the optical fiber system, and becomes the necessary trend of communication development.
In a dense wavelength division multiplexing system, a conventional light source scheme adopts array lasers, and the number of the single lasers is increased to meet the requirement of the number of channels, which clearly increases the cost and complexity of the system. Fabry-perot lasers have certain difficulties in longitudinal mode control, typically the length of the laser is on the order of hundreds of microns, the corresponding mode spacing is on the order of 1nm, and the gain spectral width of the laser is up to tens of nm, with considerable probability of multiple longitudinal mode lasing. The distributed feedback semiconductor laser with a common structure is easy to generate multimode working phenomenon under a high-speed modulation state, so that the transmission rate is limited. The distributed bragg reflector semiconductor laser is tuned by varying the injection current of the grating region, which results in a large line broadening. In addition, the distributed Bragg reflection semiconductor laser needs to adjust the current of at least more than two electrodes to fix the lasing wavelength, which is not beneficial to practical application.
The light source of the dense wavelength division multiplexing system is main equipment for backbone network communication, and usually needs to work continuously for more than a few years, and how to ensure the long-term working stability of the light source of the dense wavelength division multiplexing system is one of key technologies of light source design; meanwhile, in the dense wavelength division multiplexing system, a plurality of channels are allocated, and the wavelength difference between adjacent channels is small, 0.8nm or less. This requires the signal source to have characteristics of stable frequency, narrow line width, good frequency selectivity, and wide wavelength tuning range.
In view of the foregoing, the existing ultrashort pulse sources capable of generating signals for use in a dense wavelength division multiplexing system each have inherent disadvantages, and further improvements are needed.
Disclosure of Invention
In order to overcome the characteristics of insufficient pulse power, narrow wavelength tuning range, unstable frequency and the like generated by the traditional system, the invention provides an ultra-short pulse source for a dense wavelength division multiplexing system.
The aim of the invention is achieved by the following technical scheme:
an ultrashort pulse source for a dense wavelength division multiplexing system, which has the structure as follows: the output end of the seed pulse source 1 is connected with the input end of the pulse width widening module 2, the output end of the pulse width widening module 2 is connected with the input end of the pulse picking module 3, the output end of the pulse picking module 3 is connected with the input end of the pulse time domain segmentation module 4, the output end of the pulse time domain segmentation module 4 is connected with the input end of the primary pulse width compression module 5, the output end of the primary pulse width compression module 5 is connected with the input end of the polarized pulse coherent superposition module 6, and the output end of the polarized pulse coherent superposition module 6 is connected with the input end of the second-order pulse width compression module 7;
The seed pulse source module 1 is configured in such a way that a pump source 101 is connected with a 980nm end of a wavelength division multiplexer 102, a 1550nm end of the wavelength division multiplexer 102 is connected with an input end of a first isolator 103, an output end of the first isolator 103 is connected with an input end of a second isolator 105 through an erbium-doped optical fiber 104, an output end of the second isolator 105 is connected with an input end of a filter 106, an output end of the filter 106 is connected with an input end of a first polarization controller 107, an output end of the first polarization controller 107 is connected with an input end of the first collimator 109 through a single-mode optical fiber 108, an optical pulse is transmitted to a second collimator 115 through the first collimator 109, a first quarter wave plate 110, a first polarization sensitive isolator 112, a first polarization 113 and a second quarter wave plate 114, the second collimator 115 is connected with an input end 117 of the second coupler 117 through a phase-shift long-period grating 116, a direct output end of the second coupler is connected with a public end of the wavelength division multiplexer 102, an output end of the second coupler 117 is connected with an output end of a second coupler 120 through another polarization controller 120, and an input end of the second coupler is connected with another polarization controller 120 is connected with an input end of the second polarization splitter 118 as an input end of the seed polarization controller;
The pulse width widening module 2 has a light path structure that an optical pulse is transmitted to the first grating 202 through the first mirror 201, the first grating 202 transmits the optical pulse to the second mirror 203 and then reflects the optical pulse to the third mirror 204, the third mirror 204 reflects the optical pulse back to the first grating 202, the pulse output by the first grating 202 is transmitted to the fourth mirror 206 through the first convex lens 205 and then reflected back to the first grating 202 through the first convex lens 205, the optical pulse is transmitted to the second mirror 203 through the first grating 202, the second mirror 203 reflects the optical pulse and then reflected by the third mirror 204 and then is incident to the first grating 202, the optical pulse output by the first grating 202 is incident to the Porro prism 207 and then reflected back to the first grating 202 through the Porro prism 207, the optical pulse is reflected again through the second mirror 203, the third mirror 204, the first grating 202, the first convex lens 205 and the fourth mirror 206 according to the above route after multiple reflections, and then returns to the first grating 202, and the optical pulse is output through the first grating 202;
the pulse picking module 3 has an optical path structure that an optical pulse is incident on the second convex lens 301, the optical pulse is incident on the fifth reflecting mirror 306 after passing through the second convex lens 301, the acousto-optic modulator 302, the third convex lens 303, the third isolator 304 and the second half-wave plate 305, the optical pulse is reflected by the fifth reflecting mirror 306 to the sixth reflecting mirror 307 and then is incident on the fourth convex lens 308, the optical pulse is incident on the seventh reflecting mirror 313 after passing through the fourth convex lens 308, the third collimator 309, the second erbium-doped optical fiber 310, the fourth collimator 311 and the fifth convex lens 312, and the pump light generated by the first photodiode 316 is merged with the optical pulse previously incident on the seventh reflecting mirror 313 after passing through the fifth collimator 315 and the sixth convex lens 314. The combined light pulses are reflected to the eighth reflecting mirror 317 by the seventh reflecting mirror 313, the eighth reflecting mirror 317 reflects the light pulses to the third half-wave plate 318, and the light pulses are incident to the second grating 325 after passing through the third half-wave plate 318, the third quarter-wave plate 319, the band-pass filter 320, and the fourth half-wave plate 321. The light pulse is transmitted through the second grating 325 to the third grating 326, and the third grating 326 transmits the light pulse to the ninth mirror 327. The ninth mirror 327 reflects the pulse back to the third grating 326 and the light pulse is transmitted through the third grating 326 to the second grating 325. The light pulse output by the second grating 325 is transmitted to the tenth reflecting mirror 322, reflected by the tenth reflecting mirror 322 to the fifth half-wave plate 323, and finally output through the second polarizing beam splitter 324;
The partial pulse time domain splitting module 4 has a light path structure that the light pulse is incident to the input end of the third polarization beam splitter 402 through the sixth half-wave plate 401, the light pulse is output from the output end of the third polarization beam splitter 402 in the vertical incidence direction and is transmitted to the eleventh reflecting mirror 404 through the fourth quarter-wave plate 403, the eleventh reflecting mirror 404 reflects the light pulse back to the fourth quarter-wave plate 403, the fourth quarter-wave plate 403 transmits the light pulse to the third polarization beam splitter 402 again, meanwhile, the light pulse is output from the output end of the third polarization beam splitter 402 in the other vertical incidence direction and is transmitted to the twelfth reflecting mirror 406 and the first piezoelectric driver 407 through the fifth quarter-wave plate 405, the light pulse is reflected back to the fifth quarter-wave plate 405 by the twelfth reflecting mirror 406, the light pulse is transmitted back to the third polarization beam splitter 402 again through the fifth quarter-wave plate 405, the light pulse is transmitted to the fourth polarizing mirror 409 through the seventh half-wave plate 408 from the port output of the third polarization beam splitter 402 parallel to the incidence direction, the light pulse is transmitted to the fourth polarizing mirror 409 from the fourth polarizing mirror 409 through the fourth quarter-wave plate 412 through the fourth half-wave plate 412, the light pulse is transmitted to the fourth polarizing mirror 412 from the fourth polarizing mirror 412 to the fourth polarizing mirror 411 again, the fourth polarizing mirror 412 is transmitted to the fourth pulse splitter perpendicular to the fourth polarizing mirror 411 from the fourth polarizing mirror 412, the light pulse is output by the output end of the fourth polarization beam splitter 409 parallel to the incident direction;
The first-stage pulse width compression module 5 has a light path structure as follows, the light pulse is transmitted to the fourth grating 5001, the light pulse is reflected to the concave mirror 5002 through the fourth grating 5001, the concave mirror 5002 reflects the light pulse to the fifteenth mirror 5003, the light pulse is reflected to the concave mirror 5002 through the fifteenth mirror 5003, the light pulse is transmitted to the fourth grating 5001 through the concave mirror 5002 and the fifteenth mirror 5003 according to the above-mentioned route after passing through the fourth grating 5001, the light pulse returns to the fourth grating 5001 after multiple reflection, the fourth grating 5001 reflects the light pulse to the sixteenth mirror 5004, the light pulse is transmitted to the seventeenth mirror 5005 through the sixteenth mirror 5005, is transmitted to the eighteenth mirror 5006 through the eighteenth mirror 5006, and the light pulse is sequentially spectrally shaped through the seventh mirror 5007 after passing through the eighteenth mirror 5006: the light pulse is reflected by the twentieth mirror 5008, the twenty-first mirror 5009, the twenty-second mirror 5010, the twenty-third mirror 5011, the twenty-fourth mirror 5012, the twenty-fifth mirror 5013 and the twenty-sixth mirror 5014 in sequence, and then is incident on the twenty-seventh mirror 5015, and is incident on the input end of the first beam splitter 5016 via the twenty-seventh mirror 5015, and is transmitted from the first beam splitter The output end of 5016 is transmitted to the twenty eighth reflecting mirror 5017, the light pulse is reflected to the twenty ninth reflecting mirror 5018 by the twenty eighth reflecting mirror 5017, reflected to the thirty first reflecting mirror 5020 by the thirty ninth reflecting mirror 5018, reflected to the seventh convex lens 5021 by the thirty first reflecting mirror 5020, transmitted through the first bicolor mirror 5023 after passing through the seventh convex lens 5021, the eighth convex lens 5022 and the first bicolor mirror 5023, fused with the light pulse reflected to the first bicolor mirror 5023 by the sixteenth reflecting mirror 5107, and transmitted to the first KTiAsO by the first bicolor mirror 5023 4 Crystal 5024, light pulse passing through first KTiAsO 4 The crystal 5024 is transmitted to the second dichroic mirror 5025, the short wavelength light pulse reflected from the second dichroic mirror 5025 is transmitted to the thirty-second mirror 5103, the long wavelength light pulse transmitted from the second dichroic mirror 5025 is transmitted to the third dichroic mirror 5026, the light pulse reflected by the third dichroic mirror 5026 is transmitted to the thirteenth mirror 5104, the light pulse transmitted from the third dichroic mirror 5026 is incident to the thirty-fourth mirror 5027, the light pulse is reflected by the thirty-fourth mirror 5027 to the thirty-fifth mirror 5028, the light pulse is reflected by the thirty-fifth mirror 5028 to the ninth convex lens 5029, the ninth convex lens 5029 to the tenth convex lens 5030, the light pulse is incident to the thirty-sixth mirror 5031 after passing through the tenth convex lens 5030, the light pulse is reflected by the thirty-sixth mirror 5031 to the thirty-seventh mirror 5032, the thirty-eighth mirror 5033, the thirty-eighth mirror 5034 after passing through the thirty-seventh mirror 5032, the thirty-eighth mirror 5033 to the thirty-ninth mirror 5034, the thirty-fifth mirror 5035, and the thirty-eighth mirror 5035 to the twenty-fourth mirror 5035 4 Crystal 5036, light pulse passing through second KTiAsO 4 The crystal 5036 is transmitted to the fifth dichroic mirror 5037, the light pulse reflected from the fifth dichroic mirror 5037 is transmitted to the forty-second reflecting mirror 5105, the light pulse transmitted from the fifth dichroic mirror 5037 is transmitted to the sixth dichroic mirror 5038, the light pulse reflected by the sixth dichroic mirror 5038 is transmitted to the forty-first reflecting mirror 5106, the light pulse transmitted from the sixth dichroic mirror 5038 is incident to the eleventh convex lens 5039, and the light pulse transmitted through the eleventh convex lens 5039 is transmitted to the twelfth convexA lens 5040, which is incident on a fifth grating 5042 via a twelfth convex lens 5040, the fifth grating 5042 reflects the light pulse onto a sixth grating 5043, the sixth grating 5043 reflects the light pulse onto a first rooftop mirror 5044, the light pulse is reflected back to the fifth grating 5042 via an input route after reaching the first rooftop mirror 5044, the fifth grating 5042 transmits the light pulse to a forty-second mirror 5041, the light pulse is reflected on a forty-second mirror 5041 to a forty-fourth mirror 5045, on a forty-fifth mirror 5045 to a forty-fifth mirror 5046, on a forty-fifth mirror 5047 to a forty-sixth mirror 5048, on a forty-sixth mirror 5048 to a knife edge prism 5099, from another output end of the first beam splitter 5016 to a forty-seventh mirror 5049, the light pulse is reflected from the forty-seventh mirror 5049 to the forty-eighth mirror 5050, reflected from the forty-eighth mirror 5050 to the forty-ninth mirror 5051, reflected from the forty-ninth mirror 5051 to the fifty-first mirror 5052, reflected from the fifty-first mirror 5052 to the fifty-first mirror 5053, reflected from the fifty-first mirror 5053 to the thirteenth convex lens 5054, reflected from the fourteenth convex lens 5055 to the seventh dichroic mirror 5056, transmitted from the forty-eighth mirror 5056, and combined with the light pulse reflected from the sixty-eighth mirror 5058 to the seventh dichroic mirror 5056, and incident from the combined light pulse to the third ktiasso via the seventh dichroic mirror 5056 4 Crystal 5057, light pulse passing through third KTiAsO 4 The crystal 5057 is transferred to the eighth dichroic mirror 5058, the light pulse reflected from the eighth dichroic mirror 5058 is reflected to the fifty-second mirror 5059, the light pulse transmitted from the eighth dichroic mirror 5058 is transferred to the ninth dichroic mirror 5060, the light pulse reflected by the ninth dichroic mirror 5060 is transferred to the thirteenth mirror 5061, the light pulse output from the ninth dichroic mirror 5060 is incident to the fifty-fourth mirror 5061, the light pulse transmitted by the ninth dichroic mirror 5060 is incident to the fifty-fourth mirror 5062, the light pulse is reflected by the fifty-fourth mirror 5062 to the fifty-fifth mirror 5063, the light pulse is reflected by the fifty-fifth mirror 5063 to the fifteenth convex lens 5064, and the light pulse passes through the fifteenth convex lens 5064A sixteenth convex lens 5065, which is incident on a fifty-sixth mirror 5066, the light pulse is reflected by the fifty-sixth mirror 5066 to a fifty-seventh mirror 5067, by the fifty-seventh mirror 5067 to a fifty-eighth mirror 5068, by the fifty-eighth mirror 568 to a fifty-ninth mirror 5069, by the fifty-ninth mirror 5069 to a tenth dichroic mirror 5070, and is transmitted by the tenth dichroic mirror 5070, and the light pulse is incident on a fourth KTiAsO4 crystal 5071 after being reflected by the sixteenth mirror 5098 to the tenth dichroic mirror 5070, and the light pulse is transmitted by a fourth KTiAsO 4 The crystal 5071 is transmitted to an eleventh bicolor mirror 5072, the light pulse reflected from the eleventh bicolor mirror 5072 is transmitted to a sixty-third reflecting mirror 5073, the light pulse transmitted from the eleventh bicolor mirror 5072 is transmitted to a twelfth bicolor mirror 5074, the light pulse reflected from the twelfth bicolor mirror 5074 is transmitted to a sixty-first reflecting mirror 5075, the light pulse transmitted from the twelfth bicolor mirror 5074 is incident to a seventeenth convex lens 5076, the light pulse is transmitted to an eighteenth convex lens 5077 through an eighteenth convex lens 5076, the light pulse is incident to a seventh grating 5078 through an eighteenth convex lens 5077, the seventh grating 5078 reflects the light pulse to an eighth grating 5079, the eighth grating 5079 reflects the light pulse to a second rooftop mirror 5080, the light pulse is returned to a seventh grating 5078 through an input route, the seventh grating 5078 transmits the light pulse to a sixty-second reflecting mirror 5081, the light pulse is transmitted to a sixty-third reflecting mirror 5082 through a sixty-third reflecting mirror 5081, the light pulse is transmitted to a sixty-fifth polarizing mirror 5085 through a sixty-fifth polarizing plate 5085, the light pulse is transmitted to a light pulse polarizer 5085 through a sixty-fifth polarizing plate 5085, the light pulse polarizer, the light pulse is transmitted from the sixty-fifth polarizing plate 5085, the light pulse is transmitted to the light pulse polarizing plate The light pulse reflected by the fourth bicolor mirror 5035 is fused with the light pulse transmitted by the fourth bicolor mirror 5035 after entering the fourth bicolor mirror 5035 through the thirty-ninth reflecting mirror 5034 and then entering the second KTiAsO after being reflected by the sixty-sixth reflecting mirror 5091 to the fourth bicolor mirror 5035 4 A crystal 5036, the light pulse output from the thirteenth dichroic mirror 5085 is transmitted to a tenth half-wave plate 5093 through a sixty-seventh reflecting mirror 5092, the light pulse is incident to a third thin-film polarizer 5094 through the tenth half-wave plate 5093, the parallel polarized light pulse transmitted through the third thin-film polarizer 5094 is incident to a sixty-eighth reflecting mirror 5108, the light pulse is reflected to a seventh dichroic mirror 5056 through the sixty-eighth reflecting mirror 5108, the vertical polarized light pulse reflected by the third thin-film polarizer 5094 is incident to a fourth thin-film polarizer 5095, the light pulse is reflected by a fourth thin-film polarizer 4080 and then transmitted to a sixty-ninth reflecting mirror 5098 through an eleventh half-wave plate 5096 and a third erbium-doped optical fiber 5097, the light pulse is reflected to a tenth dichroic mirror 5070 through a sixty-ninth reflecting mirror 5098, and finally the two identical light pulses incident to a knife edge prism 5099 are transmitted to a seventy-eighth reflecting mirror 5100, the light pulse is reflected to a seventy-first reflecting mirror 5101 to a seventy-fifth reflecting mirror 5101 through a seventy-eighth reflecting mirror 5100 2 Lens 5102, two light pulses pass through CaF 2 The lens 5102 is output after fusion;
the polarization pulse coherent superposition module 6 has an optical path structure that an optical pulse is incident to the fifth polarization beam splitter 601, the optical pulse is output from an output end of the fifth polarization beam splitter 601 in a vertical incidence direction, the optical pulse is reflected to the seventy-sixth mirror 603 through the seventy-second mirror 602, is reflected to the seventy-fourth mirror 604 through the seventy-eighth mirror 603, is reflected to the seventy-fifth mirror 605 through the seventy-fourth mirror 604, is reflected back to the fifth polarization beam splitter 601 through the seventy-fifth mirror 605, is output from an output end of the fifth polarization beam splitter 601 in a parallel incidence direction, is output from the fifth polarization beam splitter 601, is transmitted to the sixth polarization beam splitter 607 through the twelfth half wave plate 606, is transmitted to the seventy-sixth mirror 608 along an output end of the sixth polarization beam splitter 607 in a vertical incidence direction, is reflected to the seventy-seventh mirror 608 through the seventy-seventh mirror 609, is reflected to the seventy-eighth mirror 610 through the seventy-eighth mirror 610, is reflected to the seventy-eighth mirror 607 through the seventy-eighth mirror 607, is transmitted to the seventy-eighth mirror 612 through the seventy-eighth mirror 611, is transmitted to the seventy-eighth polarization beam splitter 612 through the seventy-eighth half mirror 612, and is transmitted to the seventy-eighth polarization beam splitter 612 through the seventy-eighth half mirror 613, and is transmitted to the output from the seventy-eighth polarization beam splitter 612 in a parallel incidence direction;
The second-order pulse width compression module 7 has a beam structure that an optical pulse is incident on the ninth grating 701, an optical pulse output by the ninth grating 701 is incident on the tenth grating 705 after passing through the nineteenth convex lens 702, the optical slit 703 and the twenty-first convex lens 704, an optical pulse output by the tenth grating 705 is incident on the eighty mirror 707 after passing through the eighth quarter wave plate 706, the optical pulse returns to the ninth grating 701 along the original path after reaching the eighty mirror 707, an optical pulse output by the ninth grating 701 is incident on the eleventh grating 709 after passing through the hot-filled hollow core optical fiber 708, an optical pulse is reflected on the twelfth grating 710 after passing through the eleventh grating 709, and is reflected on the first fused silica plate 711 after passing through the first fused silica plate 711 and the BBO crystal 712, an optical pulse is incident on the first chirped mirror 713 after being reflected on the second chirped mirror 714 after passing through the first chirped mirror 713, the light pulse is reflected back to the first chirped mirror 713 by the second chirped mirror 714, is reflected back to the second chirped mirror 714 after being reflected between the first chirped mirror 713 and the second chirped mirror 714 for a plurality of times, is transmitted to the eighty-one mirror 715 by the second chirped mirror 714, is reflected to the second fused quartz plate 716 by the eighty-one mirror 715, is incident to the aluminum D-shaped split mirror 717 by the second fused quartz plate 716, is incident to the eighty-two mirror 718 by the D-shaped split mirror 717, is reflected to the eighty-three mirror 719 by the eighty-two mirror 718, is transmitted to the third fused quartz plate 723 by the second concave mirror 720 by the eighth thirteenth concave mirror 719, is transmitted to the eighty-four mirror 721 by the other end of the D-shaped split mirror 717, the light pulse is reflected by the eighty-fourth reflecting mirror 721 to the eighty-fifth reflecting mirror 722, reflected by the eighty-fifth reflecting mirror 722 to the second concave mirror 720, transmitted by the second concave mirror 720 to the third fused silica plate 723, and the residual light beam passing through the third fused silica plate 723 is incident to the beam blocker 724 and the light pulse passing through the third fused silica plate 723 is finally output by the twenty-first convex lens 725.
The beneficial effects are that:
1. the tunable passband filter is designed by utilizing the phase-shift long-period grating and is combined with the birefringent Sagnac filter to tune and control the wavelength in the laser cavity, so that multi-wavelength pulse output is realized.
2. The invention designs a narrow-band spectrum filter by utilizing a grating pair and an optical lens to realize ultra-short pulse output.
3. The invention designs a multi-path polarized pulse dividing and integrating structure by utilizing the space optical lens, and effectively improves the pulse power of the system.
4. The invention uses nonlinear crystal barium metaborate to design a center wavelength shifting structure to carry out nonlinear frequency conversion, thereby realizing deep ultraviolet pulse output.
Description of the drawings:
fig. 1 is a general block diagram of the present invention.
Fig. 2 is a diagram of a seed pulse source module light path used in the present invention.
Fig. 3 is a diagram of a pulse width widening module optical path used in the present invention.
Fig. 4 is a light path diagram of a pulse picking module used in the present invention.
Fig. 5 is a schematic diagram of a pulse time domain segmentation module used in the present invention.
Fig. 6 is a schematic diagram of a primary pulse width compression module used in the present invention.
Fig. 7 is a schematic diagram of a polarized pulse coherent superposition module used in the present invention.
Fig. 8 is an optical diagram of a second order pulse width compression module used in the present invention.
Detailed Description
The working principle of the present invention will be further described with reference to the accompanying drawings, and it should be understood that the parameters of the components noted in the embodiments are preferred parameters, and are not limiting to the scope of protection.
Example 1 integral Structure of the invention
As shown in fig. 1, the whole structure of the invention is that an output end of a seed pulse source 1 is connected with an input end of a power adjustment module 2, an output end of the power adjustment module 2 is connected with an input end of a polarized pulse splitting module 3, an output end of the polarized pulse splitting module 3 is connected with an input end of a polarized pulse synthesis module 4, and an output end of the polarized pulse synthesis module 4 is connected with an input end of a spectrum shaping module 5.
Example 2 seed pulse Source Module
The seed pulse source module structure is that a pump source 101 (LC 962U-shaped pump source of OCLARO company, the center wavelength 980nm, the maximum single-mode output light power is 750 mW) is connected with 980nm end of a wavelength division multiplexer 102 (COMCORE 980/1060nm single-mode optical fiber wavelength division multiplexer), 1550nm end of the wavelength division multiplexer 102 is connected with input end of a first isolator 103 (HOI-005-532 isolator of Henry company), output end of the first isolator 103 is connected with input end of a second isolator 105 (HOI-005-532 isolator of Henry company) through erbium-doped fiber 104 (Er 80-4/125 erbium-doped fiber of Thorolabs company), output end of the second isolator 105 is connected with input end of a filter 106, output end of the filter 106 (YSANDA filter 4L 2) is connected with input end of a first polarization controller 107 (QFNIRES 11S), output end of the first polarization controller 107 is connected with one of a second polarization splitter (YOSDAR) through a first WP 108 (QFN) and a second WP-248, a second polarization splitter (YOSDAR) through a single-mode optical fiber 75-5) and a second polarization splitter (YSANDA) through a single-mode optical fiber 75-005-532, a half-532 optical fiber (YSANDA) is connected with one of a first polarization splitter (YSANDA) and a half-532 (YSANDA) and a half-mode filter 106) to one of a second polarization splitter (YSAL-5) and a half-mode filter 11) through a polarization filter (YSANDA-5) and a polarization filter 11) and a half-mode filter (YSAL-0) and a half-mode filter (YSAL 11) and a polarization filter) and one-0-mode filter (YPAL 11) and one-mode filter, the second collimator 115 is connected to an input of a first coupler 117 (optical fiber coupler of model FUSED-12-1060-7/125-50/50-3U-3mm manufactured by OZ-OPTICS company) via a phase-shifted long period grating 116 (Ibsen Photonics A/S), a direct output of the first coupler 117 is connected to a common terminal of the wavelength division multiplexer 102, a coupled output of the first coupler 117 is connected to an input of a second polarization controller 120 (Thorlabs LPNIRE 11S), an output of the second polarization controller 120 is connected to an output of a third polarization controller 118 (Thorlabs LPNIRE 11S) via a polarization maintaining fiber 119 (Nufern, PM 1550-XP), and an input of the third polarization controller 118 is connected to another input of the first coupler 117, wherein an output of the first polarization beam splitter 113 in a vertical incidence direction serves as an output of the seed pulse source module. The structure forms a multi-wavelength tunable mode-locked fiber laser resonant cavity.
Example 3 pulse width widening Module
The broadening module 2 has a light path structure as follows, the light pulse is transmitted to the first grating 202 (LightSmyth company T-1702-1030 s) via the first mirror 201 (the henna GMH12-005-AU mirror), the first grating 202 transmits the light pulse to the second mirror 203 (the henna GMH12-005-AU mirror), then the light pulse is reflected to the third mirror 204 (the henna GMH12-005-AU mirror), the third mirror 204 reflects the light pulse back to the first grating 202, the pulse output by the first grating 202 is transmitted to the fourth mirror 206 (the henna GMH 12-002-NIR convex lens) via the first convex lens 205 (the henna GMH12-005-AU mirror), then the light pulse is reflected back to the first grating 202 via the first grating 202, the second mirror 203 reflects the light pulse and then is incident to the third mirror 204 (the henna GMH12-005-AU mirror), the pulse is output by the first grating 202 and the first grating 202 is transmitted to the third grating 202 via the first prism (the henna GMH12-005-AU mirror), and the pulse width of the first grating 002-AU mirror is reflected back to the first grating 202 via the first grating 202 (the henna GMH12-005-AU mirror), and the first grating 002-AU mirror is reflected back to the first grating 202 via the first grating 202, and the second grating 202 is incident on the second grating (the first prism 202 and the first prism and the second grating 002-3-AU mirror) and the pulse is reflected back to the first and the third grating 202 via the first prism and the third prism 202 and the third prism and the second prism. The pulse width widening module widens the pulse width of the optical pulse.
Example 4 pulse picking Module
The light pulse is incident to the fifth reflecting mirror 306 (Hexagon optical GMH12-005-AU reflecting mirror) after passing through the second convex lens 301, the acousto-optic modulator 302 (Gooch & Housego Fiber-Q acousto-optic modulator), the third convex lens 303 (Hexagon optical GLH12-002-002-NIR convex lens), the third isolator 304 (Hexagon optical HOI-005-532 isolator), the second half-wave plate 305 (Hexagon optical WPZ3240-248 half-wave plate), the fifth reflecting mirror 306 (Hexagon optical GMH12-005-AU reflecting mirror), the sixth reflecting mirror 307 (Hexagon optical GMH12-005-AU reflecting mirror) after reflecting the light pulse to the fourth convex lens 308 (Hexagon optical GLH12-002-002-NIR convex lens), the third collimator 309 (Hexagon optical GLH 12-002-NIR convex lens), the second erbium-doped optical WT 310 (Thorabs Er80-4/125 erbium-Fiber), the fourth collimator 311 (WT & T optical W-M collimator), the fifth reflecting mirror 306 (Hexagon optical GMH12-005-AU reflecting mirror) after reflecting the fifth reflecting mirror 306 (Hexagon optical GMH12-005-AU reflecting mirror), the light pulse to the fourth convex lens 308 (Hexagon optical GLH12-002-002-NIR convex lens) after passing through the fourth convex lens 308, the third collimator 309 (Hexagon optical GLH 12-002-002-002-NIR convex lens), the second erbium-OCR 3 (Hexagon optical Fiber 3, the second erbium-3-5 optical Fiber, the second light pulse 3 (Hexagon optical Fiber) and the fourth collimator 3). The fused light pulses are reflected by the seventh mirror 313 to the eighth mirror 317 (the Henscot GMH12-005-AU mirror), the eighth mirror 317 reflects the light pulses to the third half-wave plate 318 (the Henscot WPZ3240-248 half-wave plate), and the light pulses are incident on the second grating 325 (the LightSmyth LSFSG-1000-3318-94 grating) through the third half-wave plate 318, the third quarter-wave plate 319 (the Henscot WPZ4310-248 quarter-wave plate), the band-pass filter 320 (the yunsandena CW4L2 filter), and the fourth half-wave plate 321 (the Henscot WPZ3240-248 half-wave plate). The light pulses are transmitted through the second grating 325 to a third grating 326 (LightSmyth company LSFSG-1000-3318-94 grating), the third grating 326 transmitting the light pulses to a ninth mirror 327 (Hengyo optical GMH12-005-AU mirror). The ninth mirror 327 reflects the pulse back to the third grating 326 and the light pulse is transmitted through the third grating 326 to the second grating 325. The light pulse output by the second grating 325 is transmitted to a tenth reflecting mirror 322 (a Henscot GMH12-005-AU reflecting mirror), reflected by the tenth reflecting mirror 322 to a fifth half-wave plate 323 (a Henscot WPZ3240-248 half-wave plate), and finally output through a second polarizing beam splitter 324 (a QTFBC-1309 polarizing beam splitter of Kongtum corporation); the pulse picking module 3 reduces the pulse repetition frequency and performs pre-shaping to compensate for losses caused by placing the acousto-optic modulator in the configuration.
Example 5 pulse time Domain segmentation Module
The pulse time domain splitting module 4 has an optical path structure that an optical pulse is incident to an input end of the third polarization beam splitter 402 (Kongtum company QTFBC-1216 polarization beam splitter) through the sixth half-wave plate 401 (Hengtum optical WPZ2410-248 half-wave plate), the optical pulse is transmitted to the eleventh reflecting mirror 404 (Hengtum optical GMH12-005-AU reflecting mirror) through the fourth quarter-wave plate 403 (Hengtum optical WP 4410-248) from an output end of the third polarization beam splitter 402 in a vertical incidence direction through the fifth quarter-wave plate 405, the eleventh reflecting mirror 404 reflects the optical pulse back to the fourth quarter-wave plate 403 (Hengtum optical WPH 12-005-AU reflecting mirror), the fourth quarter-wave plate 403 transmits the optical pulse to the third polarization beam splitter 402 again, and the optical pulse is transmitted to the twelfth reflecting mirror 406 (Hengtum optical GMH12-005-AU reflecting mirror) from another output end of the third polarization beam splitter 402 in a vertical incidence direction through the fifth quarter-wave plate 405, the optical pulse is reflected back to the eleventh reflecting mirror 404 (Hengtum optical GMH12-005-AU reflecting mirror 4545) through the fifth-248) from the fifth reflecting mirror 406 (Hengtum optical GMH12-005-AU reflecting mirror 248) and the fifth-AU reflecting the fifth-wave plate 248 to the fifth polarizing beam splitter 408 (Hengtum optical beam splitter) from another output end perpendicular to the third polarization beam splitter 408 (Hengtum optical fiber laser) from the fourth polarizing film 1216 0-X-end), the light pulse is transmitted from the port of the fourth polarization beam splitter 409 perpendicular to the incident direction to the thirteenth mirror 411 (the constant optical GMH12-005-AU mirror) through the sixth quarter wave plate 410 (the constant optical WPZ4410-248 quarter wave plate), the thirteenth mirror 411 reflects the light pulse back to the sixth quarter wave plate 410, the sixth quarter wave plate 410 transmits the light pulse back to the fourth polarization beam splitter 409 again, and at the same time, the light pulse is transmitted from the other port of the fourth polarization beam splitter 409 perpendicular to the incident direction to the fourteenth mirror 413 (the constant optical GMH12-005-AU mirror) and the second piezoelectric driver 414 (the stago LLS 4545) through the seventh quarter wave plate 412, the light pulse is transmitted again to the fourth polarization beam splitter 409 through the seventh quarter wave plate 412 from the other port of the fourth polarization beam splitter 409 perpendicular to the incident direction, and the light pulse is output from the output port of the fourth polarization beam splitter 409 parallel to the incident direction.
Example 6 Primary pulse Width compression Module
The first-stage pulse width compression module 5 has a light path structure that light pulses are transmitted to a fourth grating 5001 (LSFSG-1000-5085-94 grating of LightSmyth company), the light pulses are reflected to a first concave mirror 5002 (GMH-13 concave mirror of henna company) through the fourth grating 5001, the first concave mirror 5002 reflects the light pulses to a fifteenth mirror 5003 (GMH 12-0050-AU mirror) and then are transmitted to the fourth grating 5001 through the first concave mirror 5002 after being reflected to the first concave mirror 5002, the light pulses are transmitted again to the fourth grating 5001 through the first concave mirror 5002 and the fifteenth mirror 5003 according to the above-mentioned route, the light pulses are reflected to the fourth grating 5001 after being reflected to a plurality of times, the fourth grating 5001 reflects the light pulses to a sixteenth mirror 5004 (GMH 12-0050-AU mirror), the light pulses are transmitted to a seventeenth mirror 50050 (GMH 12-0050-AU mirror) through the sixteenth mirror 5004, and then are transmitted to a seventeenth mirror 5006-eighteenth mirror (GMH-AU mirror) through the seventeenth mirror 5006-AU mirror) after being reflected to the seventeenth mirror 5006 in turn: the light pulse is incident after being reflected by a twentieth mirror 5008 (Henscot GMH12-0050-AU mirror), a twenty-first mirror 5009 (Henscot GMH12-0050-AU mirror), a twenty-second mirror 5010 (Henscot GMH12-0050-AU mirror), a twenty-third mirror 5011 (Henscot GMH12-0050-AU mirror), a twenty-fourth mirror 5012 (Henscot GMH12-0050-AU mirror), a twenty-fifth mirror 5013 (Henscot GMH12-0050-AU mirror), and a twenty-sixth mirror 5014 (Henscot GMH12-0050-AU mirror) in this order To a twenty-seventh mirror 5015 (a transoceanic GMH12-0050-AU mirror), the output of the twenty-seventh mirror 5015 is the output of the polarized pulse module. The light pulse is incident to the input end of the first beam splitter 5016 (SIGMA OBCL 20-1064-R50), the light pulse is transmitted from the output end of the first beam splitter 5016 to the eighth mirror 5017 (Henscot GMH12-0050-AU mirror), the light pulse is reflected to the twenty-ninth mirror 5018 (Henscot GMH12-0050-AU mirror) through the twenty-ninth mirror 5017, the light pulse is reflected to the thirty-ninth mirror 5018 (Henscot GMH12-0050-AU mirror), the thirty-first mirror 5019 reflects the light pulse to the thirty-first mirror 5020 (Henscot GMH12-0050-AU mirror), the light pulse is reflected to the seventh convex lens 5021 (Henscot GLH 12-002-002-AU convex lens) through the thirty-first mirror 5020-through the thirty-first mirror 5020, the light pulse is transmitted to the light pulse optical lens 5022 (Henscot GMH 12-002-002-AU convex lens) through the twenty-ninth mirror), the light pulse is transmitted to the light pulse optical lens 5023 through the thirty-first mirror and the light pulse is fused with the light pulse through the thirty-first mirror 5023 (Henscot GMH12-0050-AU mirror) after the light pulse is transmitted through the thirty-first mirror 5020 to the light mirror 4 Crystal 5024 (Dintech density 3.4504 g/cm) 3 KTA crystal), light pulse through the first KTiAsO 4 The crystal 5024 is transmitted to the second dichroic mirror 50250 (the Thorlabs DMSP1180 dichroic mirror), the short wavelength light pulse reflected from the second dichroic mirror 5025 is transmitted to the thirty-second mirror 5103 (the henna GMH12-0050-AU mirror), the long wavelength light pulse transmitted from the second dichroic mirror 5025 is transmitted to the third dichroic mirror 5026 (the Thorlabs DMSP1180 dichroic mirror), the light pulse reflected by the third dichroic mirror 5026 is transmitted to the third thirteenth mirror 5104 (the henna GMH12-0050-AU mirror), the light pulse transmitted from the third dichroic mirror 5026 is incident to the thirty-fourth mirror 5027 (the henna GMH12-0050-AU mirror), the light pulse is reflected by the thirty-fourth mirror 5027 to the thirty-fifth mirror 5028 (the henna GMH12-0050-AU mirror), the light pulse is reflected by the thirty-fifth mirror 5028 to the ninth convex lens 5029 (the henna GMH12-0050-AU mirror), and the light pulse transmitted by the third dichroic mirror 5026 is incident to the thirty-fourth mirror 5027 (the henna 5029)GLH12-002-002-NIR convex lens) is incident on a thirty-sixth mirror 5031 (Henscot GMH12-0050-AU mirror) through a tenth convex lens 5030, the light pulse is reflected by the thirty-sixth mirror 5031 to a thirty-seventh mirror 5032 (Henscot GMH12-0050-AU mirror), reflected by the thirty-seventh mirror 5032 to a thirty-eighth mirror 5033 (Henscot GMH12-0050-AU mirror), reflected by the thirty-eighth mirror 5033 to a thirty-ninth mirror 5034 (Henscot GMH12-0050-AU mirror), transmitted by the thirty-ninth mirror 5034 to a fourth dichroic mirror 5035 (Thorlabs DMSP1180 double), and transmitted by the fourth dichroic mirror 5035 to a second KTiAsO 4 Crystal 5036 (Dintech density 3.4504 g/cm) 3 KTA crystal), light pulse through a second KTiAsO 4 The crystal 5036 is transmitted to a fifth dichroic mirror 5037 (a DMSP1180 dichroic mirror by Thorolabs corporation), the light pulse reflected from the fifth dichroic mirror 5037 is transmitted to a forty-first reflecting mirror 5105 (a Henscot optical GMH12-0050-AU reflecting mirror), the light pulse transmitted from the fifth dichroic mirror 5037 is transmitted to a sixth dichroic mirror 5038 (a DMSP1180 dichroic mirror by Thorolabs corporation), the light pulse reflected from the sixth dichroic mirror 5038 is transmitted to a forty-first reflecting mirror 5106 (a Henscot optical GMH12-0050-AU reflecting mirror), the light pulse transmitted from the sixth dichroic mirror 5038 is incident to an eleventh convex lens 5039 (a Henscot optical GLH12-002-002-NIR convex lens), the light pulse transmitted from the sixth dichroic mirror 5038 is transmitted to a twelfth convex lens 5040 (a Henscot optical GLH12-002-002-NIR convex lens), incident on a fifth grating 5042 (LSFSG-1000-32250-94 grating from LightSmyth), the fifth grating 5042 reflects the light pulses onto a sixth grating 5043 (LSFSG-1000-32250-94 grating from LightSmyth), the sixth grating 5043 reflects the light pulses onto a first rooftop mirror 5044 (macro liter photo-HS-002103), the light pulses reach the first rooftop mirror 5044 and are reflected back to the fifth grating 5042 along the input route, the fifth grating 5042 transmits the light pulses to a forty-second mirror 5041 (henna GMH12-0050-AU mirror), the light pulses are reflected by the forty-second mirror 5041 to a forty-third mirror 5045 (henna GMH12-0050-AU mirror), the light pulses are reflected by the forty-thirteenth mirror 5045 to a forty-fourth mirror 5046, reflected by a forty-fourth mirror 5046 (Hengyang optics GMH12-0050-AU mirror) to a forty-fifth mirror 5047 (Henscoptical GMH12-0050-AU mirror), reflected by a forty-fifth mirror 5047 to a forty-sixth mirror 5048 (Henscoptical GMH12-0050-AU mirror), reflected by a forty-sixth mirror 5048 to a knife edge prism 5099, transmitted from the other output end of the first beam splitter 5016 to a forty-seventh mirror 5049 (Henscoptical GMH12-0050-AU mirror), reflected by a forty-seventh mirror 5049 to a forty-eighth mirror 5050 (Henscoptical GMH12-0050-AU mirror), reflected by a forty-eighth mirror 5050 to a forty-ninth mirror 5051, reflected by a forty-ninth mirror 5051 (Henscoptical GMH12-0050-AU mirror) to a fifty mirror 5052 (Henscoptical GMH12-0050-AU mirror), the light pulse is reflected by the fifty-first mirror 5053 (the Hexagon GMH12-0050-AU mirror) and the fifty-first mirror 5053 to the thirteenth convex lens 5054 (the Hexagon GLH12-002-002-NIR convex lens), the thirteenth convex lens 5054 and the fourteenth convex lens 5055 (the Hexagon GLH12-002-002-NIR convex lens), the fourteenth convex lens 5055 to the seventh dichroic mirror 5056 (the Thorlabs DMSP1180 dichroic mirror), the light pulse is transmitted by the seventh dichroic mirror 5056 and is merged with the light pulse reflected by the sixty-eighth mirror 5108 (the Hexagon GMH12-0050-AU mirror) after being incident on the seventh dichroic mirror 5056, the fused light pulse is incident to a third KTiAsO through a seventh dichroic mirror 5056 4 Crystal 5057 (Dintech density 3.4504 g/cm) 3 KTA crystal), light pulse through a third KTiAsO 4 The crystal 5057 is transmitted to an eighth dichroic mirror 5058 (a DMSP1180 dichroic mirror from Thorolabs corporation), the light pulse reflected from the eighth dichroic mirror 5058 is reflected to a fifty second mirror 5059 (a Henscot optical GMH12-0050-AU mirror), the light pulse transmitted from the eighth dichroic mirror 5058 is transmitted to a ninth dichroic mirror 5060 (a DMSP1180 dichroic mirror from Thorolabs corporation), the light pulse reflected from the ninth dichroic mirror 5060 is transmitted to a fifth thirteenth mirror 5061 (a Henscot optical GMH12-0050-AU mirror), the light pulse output from the ninth dichroic mirror 5060 is incident to a fifty fourth mirror 5061 (a Henscot optical GMH12-0050-AU mirror), the light pulse transmitted through the ninth dichroic mirror 5060 is incident to a fifty fifth mirror 5063 (a Henscot optical GMH12-0050-AU mirror), and the light pulse transmitted through the fifty fourth mirror 5062 is reflected to a fifty fifth mirror 5063 (a Henscot optical GMH 12)After reflection to the fifteenth convex lens 5064 (Henschel 12-002-002-NIR convex lens) via the fifty-fifth mirror 5063, the light pulse passes through the fifteenth convex lens 5064, the sixteenth convex lens 50650 (Henschel 12-002-NIR convex lens), and is incident to the fifty-sixth mirror 5066 (Henschel GMH12-0050-AU mirror), the light pulse is reflected to the fifty-seventh mirror 5067 (Henschel GMH12-0050-AU mirror) via the fifty-sixth mirror 5066, reflected to the fifty-eighth mirror 5068 (Henschel 12-0050-AU mirror) via the fifty-eighth mirror 5067, reflected to the fifty-ninth mirror 5069 via the fifty-ninth mirror 5068 (Henschel GMH12-0050-AU mirror), reflected to the tenth bicolor mirror 5070 (Thoralabs DMSP 0 bicolor), and the tenth bicolor mirror output light pulse is transmitted to the tenth mirror 5070 via the tenth mirror (Henschel GMH12-0050-AU mirror), and the tenth light pulse is transmitted to the tenth mirror 5070 via the tenth mirror 5070 4 Crystal 5071 (Dintech density 3.4504 g/cm) 3 KTA crystal) to eleventh dichroic mirror 5072 (Thorlabs DMSP1180 dichroic mirror), light pulses reflected from eleventh dichroic mirror 5072 to sixty mirror 5073 (henna GMH12-0050-AU mirror), light pulses transmitted from eleventh dichroic mirror 5072 to twelfth dichroic mirror 5074 (Thorlabs DMSP1180 dichroic mirror), light pulses reflected by twelfth dichroic mirror 5074 to sixty mirror 5075 (henna GMH12-0050-AU mirror), light pulses transmitted from twelfth dichroic mirror 5074 to seventeenth convex lens 5076 (henna GLH12-002-002-NIR convex lens), light pulses transmitted through seventeenth convex lens 5076 (henna GLH12-002-002-NIR convex lens) to eighteenth convex lens 5077 (henna GLH 12-002-NIR convex lens), light pulses transmitted through eighteenth convex lens 5077 to seventh convex lens 5078 (light grating fsh-fsg 50-75) to light grating 5079 to light, and light pulses transmitted from seventeenth dichroic mirror 5074 to light grating (light grating back to seventeenth light grating 5079) to light grating 5080, and light pulses transmitted from seventeenth dichroic mirror 5074 to light grating (henna) to light grating 5080, and light pulses transmitted from seventeenth dichroic mirror 5074 to light grating back to light grating 5080 (henna) The grating 5078 transmits the light pulse to a sixty-second mirror 5081 (Henscot GMH12-0050-AU mirror), the light pulse is reflected by the sixty-second mirror 5081 to a sixty-third mirror 5082 (Henscot GMH12-0050-AU mirror), reflected by the sixty-third mirror 5082 to a sixty-fourth mirror 5083 (Henscot GMH12-0050-AU mirror), reflected by the sixty-fourth mirror 5083 to a knife edge prism 4084, and reflected by a laser 5084 (EKSPLA APL 21050 commercial picosecond Nd: YAG laser) to a thirteenth dichroic mirror 5085 (Thorlabs DMSP1180 dichroic mirror), the light pulse reflected from the thirteenth dichroic mirror 5085 is incident to a first thin film polarizer 5087 via an eighth half-wave plate 5086 (constant optical WPZ2310-248 half-wave plate), the parallel polarized light pulse transmitted through the first thin film polarizer 5087 is incident to a sixty-fifth mirror 5107 (constant optical GMH12-0050-AU mirror), the light pulse is reflected by the sixty-fifth mirror 5107 to a first dichroic mirror 5023, the vertical polarized light pulse reflected by the first thin film polarizer 5087 is incident to a second thin film polarizer 5088 (Thorlabs LPNIRE 11S), the light pulse is reflected by the second thin film polarizer 5088 and then transmitted to a sixty-fifth mirror 5091 (Thorlabs GMH 12-GMH mirror 5035) via a ninth half-wave plate 5089 (constant optical WPZ2310-248 half-wave plate), a second erbium-doped optical fiber 5090 (Thorlabs Er 80-4/1250), the light pulse reflected by the fourth bicolor mirror 5035 is fused with the light pulse transmitted by the fourth bicolor mirror 5035 after entering the fourth bicolor mirror 5035 through the thirty-ninth reflecting mirror 5034, and the fused light pulse enters the second KTiAsO 4 A crystal 5036, the light pulse output from the thirteenth dichroic mirror 5085 is transmitted to a tenth half-wave plate 5093 (Henscot optical WPZ2310-248 half-wave plate) via a sixty-seventh mirror 4092 (Henscot optical GMH12-0050-AU mirror), the light pulse is incident to a third thin film polarizer 5094 via the tenth half-wave plate 5093, the parallel polarized light pulse transmitted through the third thin film polarizer 5094 is incident to a sixty-eighth mirror 5108 (Henscot optical GMH12-0050-AU mirror), the light pulse is reflected to the seventh dichroic mirror 5056 via a sixty-eighth mirror 4106, and the perpendicular polarized light pulse reflected by the third thin film polarizer 5094 is incident to a fourth thin film polarizer 5095 (T)The optical pulse is reflected by the fourth thin film polarizer 5095 and then transmitted to the sixty-ninth mirror 5098 (Hexagon GMH12-005-AU mirror) by the eleventh half-wave plate 5096 (Hexagon WPZ2310-248 half-wave plate), the third erbium-doped fiber 5097 (Thorolabs Er80-4/125 erbium-doped fiber), the optical pulse is reflected by the sixty-ninth mirror 5098 to the tenth bicolor mirror 5070, and finally the two optical pulses with the same energy and pulse duration are transmitted to the seventy-third mirror 5100 (Hexagon GMH12-005-AU mirror) by the knife-edge prism 5099 (SIGMA KRKi-25-10H), the optical pulse is reflected by the seventy-third mirror 5100 to the seventy-third mirror 5101 (Hexagon GMH12-005-AU mirror) to CaF 2 Lens 5102 (Hengyang optics GWH 51-012), two light pulses pass through CaF 2 The lens 5102 is merged and output. The primary pulse width compression module performs multichannel power amplification and pulse width compression on the pulse.
Example 7 polarized pulse coherent superposition Module
The polarized pulse coherent superposition module 6 has an optical path structure that light pulses are incident to a fifth polarization beam splitter 601 (QTFBC-1216 polarization beam splitter of Kongtum company), output from an output end of the fifth polarization beam splitter 601 perpendicular to the incident direction, reflected by a seventy-second mirror 602 (a henna GMH12-005-AU mirror), reflected by a seventy-fourth mirror 603 (a henna GMH12-005-AU mirror), reflected by a seventy-fourth mirror 604 to a seventy-fifth mirror 605 (a henna GMH12-005-AU mirror), reflected by a seventy-fifth mirror 605 back to the fifth polarization beam splitter 601, the light pulse is output through an output end of the fifth polarizing beam splitter 601 parallel to the incident direction, is output through the fifth polarizing beam splitter 601, is transmitted to a sixth polarizing beam splitter 607 (a QTFBC-1216 polarizing beam splitter of Kongtum company) through a twelfth half-wave plate 606 (a half-wave plate of heng optics WPZ 2310-248), is transmitted to a seventy-sixth mirror 608 (a heng optics GMH12-005-AU mirror) along the output end of the sixth polarizing beam splitter 607 perpendicular to the incident direction, is reflected to a seventy-seventh mirror 609 (a heng optics GMH12-005-AU mirror) through the seventy-sixth mirror 608, is reflected to a seventy-eighth mirror 610 (a heng optics GMH12-005-AU mirror) through the seventy-seventh mirror 609, the light pulse is reflected by the seventy-eighth reflecting mirror 610 to the seventy-ninth reflecting mirror 611 (the Hedycepic optical GMH12-005-AU reflecting mirror), reflected by the seventy-ninth reflecting mirror 611 to the sixth polarizing beam splitter 607, output by another output end parallel to the incidence direction of the sixth polarizing beam splitter 607, transmitted by the sixth polarizing beam splitter to the thirteenth half-wave plate 612 (the Hedycepic optical WPZ2310-248 half-wave plate), transmitted by the thirteenth half-wave plate 612 to the seventh polarizing beam splitter 613 (the Kongtum company QTFBC-1216 polarizing beam splitter), and finally output by the seventh polarizing beam splitter 613.
Example 8 second order pulse Width compression Module
The second-order pulse width compression module 7 has a beam structure that light pulses are incident on a ninth grating 701 (LSFSG-1000-3225-94 grating by LightSmyth corporation), light pulses output through the ninth grating 701 are incident on a tenth grating 705 (LSFSG-1000-3225-94 grating by LightSmyth corporation) through a nineteenth convex lens 702 (optical GLH12-002-002-NIR convex lens), an optical slit 703 (Thorlabs S170 LK), a twentieth convex lens 704 (optical GLH12-002-002-NIR convex lens), light pulses output through the tenth grating 705 are incident on an eighth reflecting mirror 707 (optical GMH12-005-AU reflecting mirror) through an eighth quarter wave plate 706 (WPZ 4310-248 quarter wave plate by henna corporation), the light pulse reaches the eightieth mirror 707 and returns to the ninth grating 701 along the original path, the light pulse output by the ninth grating 701 is incident on the eleventh grating 709 (LSFSG-1000-3225-94 grating by LightSmyth corporation) through the thermally filled hollow core fiber 708 (NKT, HC-1570-02), the light pulse is reflected on the twelfth grating 710 by the eleventh grating 709, the light pulse is reflected on the first fused silica plate 711 (CreatorOptics, 5.75 mm) by the twelfth grating 710 (LSFSG-1000-3225-94 grating by LightSmyth corporation), the light pulse is incident on the first chirped mirror 713 (Ultrafast Innovation, CM 82) through the first fused silica plate 711, BBO crystal 712 (phase-matched BBO crystal of type i 29.2 μm thickness), the light pulses are reflected back to the first chirped mirror 713 by the second chirped mirror 714, reflected back to the second chirped mirror 714 (CM 82, ultrafast Innovation) by multiple reflections between the first chirped mirror 713 and the second chirped mirror 714, transmitted to the eighty-first mirror 715 (the Hesubject optical GMH12-005-AU mirror), reflected to the second fused silica plate 716 (Creater optics,70 μm) by the eighty-first mirror 715, incident to the aluminum D-shaped split mirror 717 (Hesubject optical HBS 12-012-30-PD) by the second fused silica plate 716, incident to the eighth second mirror 718 (Hesubject optical GMH 12-012-30-PD) by the D-split mirror 718 (Hesubject optical GMH12-005-AU mirror), reflected to the eighth mirror 718 (Hesubject optical GMH12-005-AU mirror), transmitted to the eighth mirror 719 (Hesubject optical GMH12-005-AU mirror) by the eighth mirror 715, transmitted to the eighth mirror 720 (via the Creater optical GMH-13-concave mirror), transmitted to the eighth mirror 720 (e.g., transmitted to the eighth mirror 720) by the eighth mirror, and transmitted to the eighth mirror 720-second mirror 720 via the eighth mirror 720-second mirror, and transmitted to the eighth mirror 720 via the eighth mirror 720-third mirror 720 (e-third mirror, via the third mirror, the eighth mirror 720-second mirror, the eighth mirror 720-75-AU mirror) by the eighth mirror, and the eighth mirror transmitted to the eighth mirror 720 and the eighth mirror via the eighth mirror 720 (e-third mirror 720) and the eighth mirror 75, the residual light beam passing through the third fused silica plate 723 is incident on a beam blocker 724 (Ophir Optronics Solutions ltd. Pd 300-IR) and the light pulse passing through the third fused silica plate 723 is finally output by a twenty-first convex lens 725 (a constant optical GLH12-002-002-NIR convex lens). The second order pulse width compression module 7 implements further pulse width compression and center wavelength shifting.
Example 9 working principle of the invention
The working principle of the present invention is described with reference to the above embodiments and the drawings.
In the seed pulse source module 1, the phase-shift long-period grating 116, the filter 106 and the birefringent Sagnac filter structure formed by combining the second polarization controller 120, the third polarization controller 118 and the polarization maintaining fiber 119 can tune and control a laser to realize multi-wavelength pulse output. The pulse picking module 3 compresses the pulse spectrum width to prevent the amplified pulse from damaging the amplifying device, and the acousto-optic modulator 302 can reduce the repetition frequency of the optical pulse to obtain higher pulse energy in the following structure. The spectrum shaping structure composed of the grating and the optical lens can perform pre-shaping, and gain narrowing effect generated in the amplifying process can realize the output of ultra-short pulse. The primary pulse width compression module 5 uses a multi-pass pulse amplification and pulse width compression structure for efficient power amplification and pulse width compression. The narrow-band spectrum filter is formed by the grating pair, the optical lens and the optical slit for further pulse width compression so as to obtain ultra-short pulse output. Finally, frequency conversion is carried out by nonlinear crystal barium metaborate to realize deep ultraviolet ultrashort pulse output.
Claims (1)
1. An ultrashort pulse source for a dense wavelength division multiplexing system, which has the structure as follows: the output end of the seed pulse source (1) is connected with the input end of the pulse width widening module (2), the output end of the pulse width widening module (2) is connected with the input end of the pulse picking module (3), the output end of the pulse picking module (3) is connected with the input end of the pulse time domain segmentation module (4), the output end of the pulse time domain segmentation module (4) is connected with the input end of the first-stage pulse width compression module (5), the output end of the first-stage pulse width compression module (5) is connected with the input end of the polarized pulse coherent superposition module (6), and the output end of the polarized pulse coherent superposition module (6) is connected with the input end of the second-order pulse width compression module (7);
the seed pulse source module (1) is structurally characterized in that a pump source (101) is connected with a 980nm end of a wavelength division multiplexer (102), the 1550nm end of the wavelength division multiplexer (102) is connected with an input end of a first isolator (103), an output end of the first isolator (103) is connected with an input end of a second isolator (105) through an erbium-doped optical fiber (104), an output end of the second isolator (105) is connected with an input end of a filter (106), an output end of the filter (106) is connected with an input end of a first polarization controller (107), an output end of the first polarization controller (107) is connected with an input end of a first collimator (109) through a single-mode optical fiber (108), an optical pulse is transmitted to a second collimator (115) through the first collimator (109), a first half-wave plate (110), a first quarter-wave plate (111), a first polarization sensitive isolator (112), a first polarization beam splitter (113) and a second quarter-wave plate (114) after being transmitted to the second collimator (115), the second collimator (115) is connected with an output end of the second collimator (116) through a single-mode optical fiber (117) through a single-mode optical fiber (108), the output end of the first polarization controller (117) is connected with an output end of the second collimator (117) through a common coupler (120), the output end of the second polarization controller (120) is connected with the output end (118) of the third polarization controller through a polarization maintaining fiber (119), the input end of the third polarization controller (118) is connected with the other input end of the second coupler (117), and the output end of the first polarization beam splitter (113) in the vertical incidence direction is used as the output of the seed pulse source module;
The pulse width widening module (2) is provided with a light path structure that light pulses are transmitted to the first grating (202) through the first reflecting mirror (201), the first grating (202) transmits the light pulses to the second reflecting mirror (203) and then reflects the light pulses to the third reflecting mirror (204), the third reflecting mirror (204) reflects the light pulses back to the first grating (202), the pulses output by the first grating (202) are transmitted to the fourth reflecting mirror (206) through the first convex lens (205) and then reflected back to the first grating (202) through the first convex lens (205), the light pulses are transmitted to the second reflecting mirror (203) through the first grating (202), the second reflecting mirror (203) reflects the light pulses and then enters the first grating (202) through the third reflecting mirror (204), the light pulses output by the first grating (202) enter the Porro prism (207) and then reflect back to the first grating (202) through the third reflecting mirror (207), and the light pulses are transmitted back to the first grating (202) through the second reflecting mirror (202), the third reflecting mirror (204) and the first grating (202) again according to the route described above, and the light pulses are transmitted to the fourth reflecting mirror (202) through the third reflecting mirror (202) for multiple times;
the pulse picking module (3) has a light path structure that light pulses are incident to a second convex lens (301), the light pulses are incident to a fifth reflecting mirror (306) after passing through the second convex lens (301), an acousto-optic modulator (302), a third convex lens (303), a third isolator (304) and a second half wave plate (305), the light pulses are reflected to a sixth reflecting mirror (307) by the fifth reflecting mirror (306) and then are incident to a fourth convex lens (308), the light pulses are incident to a seventh reflecting mirror (313) after passing through a fourth convex lens (308), a third collimator (309), a second erbium-doped optical fiber (310), a fourth collimator (311) and a fifth convex lens (312), and pump light generated by a first photodiode (316) is fused with light pulses which are incident to the seventh reflecting mirror (313) before passing through the fifth collimator (315) and the sixth convex lens (314); the fused light pulses are reflected to an eighth reflecting mirror (317) through a seventh reflecting mirror (313), the eighth reflecting mirror (317) reflects the light pulses to a third half-wave plate (318), and the light pulses are incident to a second grating (325) through the third half-wave plate (318), a third quarter-wave plate (319), a band-pass filter (320) and a fourth half-wave plate (321); the light pulse is transmitted to a third grating (326) via a second grating (325), the third grating (326) transmitting the light pulse to a ninth mirror (327); a ninth mirror (327) reflects the pulse back to the third grating (326), the light pulse being transmitted through the third grating (326) to the second grating (325); the light pulse output by the second grating (325) is transmitted to a tenth reflecting mirror (322), reflected by the tenth reflecting mirror (322) to a fifth half-wave plate (323), and finally output through a second polarization beam splitter (324);
The polarized time domain splitting module (4) has a light path structure that light pulses are incident to an input end of the third polarization beam splitter (402) through a sixth half-wave plate (401), the light pulses are output from an output end of the third polarization beam splitter (402) in a vertical incidence direction and transmitted to an eleventh reflecting mirror (404) through a fourth quarter-wave plate (403), the eleventh reflecting mirror (404) reflects the light pulses back to the fourth quarter-wave plate (403), the fourth quarter-wave plate (403) transmits the light pulses to the third polarization beam splitter (402) again, meanwhile, the light pulses are output from another output end of the third polarization beam splitter (402) in a vertical incidence direction, transmitted to a twelfth reflecting mirror (406) through a fifth quarter-wave plate (405) and a first piezoelectric driver (407), the light pulses are reflected back to the fifth quarter-wave plate (405) through a twelfth reflecting mirror (406), the fifth quarter-wave plate (405) transmits the light pulses back to the third polarization beam splitter (402) again, the light pulses are transmitted to the thirteenth reflecting mirror (411) through a port output of the third polarization beam splitter (402) in a direction parallel to the incidence direction and transmitted to the fourth polarization beam splitter (409) through a seventh reflecting mirror (411), the sixth quarter wave plate (410) transmits the light pulse back to the fourth polarization beam splitter (409) again, meanwhile, the light pulse is transmitted to the fourteenth reflecting mirror (413) and the second piezoelectric driver (414) from the other port of the fourth polarization beam splitter (409) perpendicular to the incidence direction through the seventh quarter wave plate (412), the light pulse is reflected back to the seventh quarter wave plate (412) by the fourteenth reflecting mirror (413), the seventh quarter wave plate (412) transmits the light pulse to the fourth polarization beam splitter (409) again, and the light pulse is output by the output end of the fourth polarization beam splitter (409) parallel to the incidence direction;
The first-stage pulse width compression module (5) has a light path structure as follows, the light pulse is transmitted to the fourth grating (5001), the light pulse is reflected to the concave mirror (5002) through the fourth grating (5001), the concave mirror (5002) reflects the light pulse to the fifteenth mirror (5003), the light pulse is reflected to the concave mirror (5002) through the fifteenth mirror (5003), the light pulse is transmitted to the fourth grating (5001) through the concave mirror (5002) and the fifteenth mirror (5003) according to the route after passing through the fourth grating (5001), the light pulse returns to the fourth grating (5001) after multiple reflections, the fourth grating (5001) reflects the light pulse to the sixteenth mirror (5004), the light pulse is transmitted to the seventeenth mirror (5005) through the sixteenth mirror (5005), the light pulse is transmitted to the nineteenth mirror (5006) through the eighteenth mirror (5006), the light pulse is sequentially transmitted to the ninth mirror (5007) through the seventeenth mirror (5007), and the light pulse is shaped through the tenth mirror sequentially: the light pulse sequentially passes through a twentieth reflecting mirror (5008), a twenty-first reflecting mirror (5009), a twenty-second reflecting mirror (5010), a twenty-third reflecting mirror (5011), a twenty-fourth reflecting mirror (5012), a twenty-fifth reflecting mirror (5013) and a twenty-sixth reflecting mirror (5014), and then is incident on a twenty-seventh reflecting mirror (5015), and is incident on an input end of the first beam splitter (5016) through the twenty-seventh reflecting mirror (5015), and is transmitted from an output end of the first beam splitter (5016) to an twenty-eighth reflecting mirror (5017), and is reflected on a twenty-ninth reflecting mirror (5018) through the twenty-eighth reflecting mirror (5017), and is reflected on a thirty-ninth reflecting mirror (5019) through the twenty-ninth reflecting mirror (5018), and is reflected on the thirty-ninth reflecting mirror (5019) A reflecting mirror (5020), the light pulse is reflected to the seventh convex lens (5021) by the thirty-first reflecting mirror (5020), the light pulse is transmitted and output by the first dichroic mirror (5023) after passing through the seventh convex lens (5021), the eighth convex lens (5022) and the first dichroic mirror (5023), the light pulse is fused with the light pulse reflected and output by the sixty-third reflecting mirror (5107) after being reflected to the first dichroic mirror (5023), and the fused light pulse is transmitted to the first KTiAsO by the first dichroic mirror (5023) 4 A crystal (5024) for optical pulse passing through the first KTiAsO 4 The crystal (5024) is transmitted to the second dichroic mirror (5025), the short wavelength light pulse reflected from the second dichroic mirror (5025) is transmitted to the thirty-second mirror (5103), the long wavelength light pulse transmitted from the second dichroic mirror (5025) is transmitted to the third dichroic mirror (5026), the light pulse reflected by the third dichroic mirror (5026) is transmitted to the thirty-seventh mirror (5032), the light pulse transmitted from the third dichroic mirror (5026) is incident to the thirty-fourth mirror (5027), the light pulse is reflected by the thirty-fourth mirror (5027) to the thirty-fifth mirror (5028), reflected by the thirty-fifth mirror (5028) to the ninth convex lens (5029), transmitted by the ninth convex lens (5030) to the thirty-sixth mirror (5031), reflected by the thirty-sixth mirror (5031) to the thirty-seventh mirror (5032), reflected by the thirty-seventh mirror (5032) to the thirty-fourth mirror (5033), reflected by the thirty-fifth mirror (5028) to the ninth convex lens (5030), and transmitted by the thirty-eighth mirror (5033) to the eighth mirror (5035) 4 A crystal (5036) for light pulse passing through the second KTiAsO 4 The crystal (5036) is transmitted to a fifth dichroic mirror (5037), the light pulse reflected from the fifth dichroic mirror (5037) is transmitted to a forty-first reflecting mirror (5105), the light pulse transmitted from the fifth dichroic mirror (5037) is transmitted to a sixth dichroic mirror (5038), the light pulse reflected by the sixth dichroic mirror (5038) is transmitted to a forty-first reflecting mirror (5106), the light pulse transmitted from the sixth dichroic mirror (5038) is incident on an eleventh convex lens (5039), transmitted through the eleventh convex lens (5039) to a twelfth convex lens (5040), incident on a fifth grating (5042) through the twelfth convex lens (5040), and the light pulse is reflected by the fifth grating (5042) to a sixth grating (5043)The grating (5043) reflects the light pulse onto the first roof mirror (5044), the light pulse reaches the first roof mirror (5044) and then is reflected back to the fifth grating (5042) according to an input route, the fifth grating (5042) transmits the light pulse to the forty-second reflecting mirror (5041), the light pulse is reflected to the forty-fourth reflecting mirror (5045) through the forty-second reflecting mirror (5041), is reflected to the forty-fourth reflecting mirror (5046) through the forty-fourth reflecting mirror (5045), is reflected to the forty-fifth reflecting mirror (5047) through the forty-fifth reflecting mirror (5047), is reflected to the forty-sixth reflecting mirror (5048) through the forty-sixth reflecting mirror (5048) and is reflected to the knife edge prism (5099), from the other output end of the first beam splitter (5016) to a forty-seventh mirror (5049), the light pulse is reflected by the forty-seventh mirror (5049) to a forty-eighth mirror (5050), reflected by the forty-eighth mirror (5050) to a forty-ninth mirror (5051), reflected by the forty-ninth mirror (5051) to a fifty-first mirror (5052), reflected by the fifty-first mirror (5052) to a fifty-first mirror (5053), reflected by the fifty-first mirror (5053) to a thirteenth convex lens (5054), reflected by the thirteenth convex lens (5054) to a fourteenth convex lens (5055), the light pulse is reflected to a seventh dichroic mirror (5056) through a fourteenth convex lens (5055), is transmitted through the seventh dichroic mirror (5056), and is fused with the light pulse reflected after being incident to the seventh dichroic mirror (5056) along a sixty-eight reflecting mirror (5108), and the fused light pulse is incident to a third KTiAsO through the seventh dichroic mirror (5056) 4 A crystal (5057) for light pulse passing through the third KTiAsO 4 The crystal (5057) is transmitted to an eighth dichroic mirror (5058), the light pulse reflected from the eighth dichroic mirror (5058) is reflected to a fifty-second mirror (5059), the light pulse transmitted from the eighth dichroic mirror (5058) is transmitted to a ninth dichroic mirror (5060), the light pulse reflected from the ninth dichroic mirror (5060) is transmitted to a fifty-third mirror (5061), the light pulse output from the ninth dichroic mirror (5060) is incident to a fifty-fourth mirror (5061), the light pulse transmitted from the ninth dichroic mirror (5060) is incident to a fifty-fourth mirror (5062), the light pulse is reflected to a fifty-fifth mirror (5063) from the fifty-fifth mirror (5063) to a fifteenth convex lens (5064), and the light pulse passes through the fifteenth convex lens (5064) and a sixteenth convex lens (5065)) Incident on a fifty-sixth mirror (5066), the light pulse is reflected by the fifty-sixth mirror (5066) to a fifty-seventh mirror (5067), reflected by the fifty-seventh mirror (5067) to a fifty-eighth mirror (5068), reflected by a fifty-eighth mirror 568 to a fifty-ninth mirror (5069), reflected by the fifty-ninth mirror (5069) to a tenth dichroic mirror (5070), transmitted by the tenth dichroic mirror (5070), and incident on a fourth KTiAsO4 crystal (5071) as a result of the light pulse being transmitted by the tenth dichroic mirror (5070) and the light pulse reflected by the sixteenth mirror (5098) to the tenth dichroic mirror (5070), and the light pulse is incident on the fourth KTiAsO4 crystal (5071) as a result of the light pulse being transmitted by the fourth KTiAsO 4 The crystal (5071) is transmitted to an eleventh dichroic mirror (5072), the light pulse reflected from the eleventh dichroic mirror (5072) is transmitted to a sixty mirror (5073), the light pulse transmitted from the eleventh dichroic mirror (5072) is transmitted to a twelfth dichroic mirror (5074), the light pulse reflected by the twelfth dichroic mirror (5074) is transmitted to a sixty-first mirror (5075), the light pulse transmitted from the tenth dichroic mirror (5074) is transmitted to a seventeenth convex lens (5076), the light pulse is transmitted to an eighteenth convex lens (5077) through the eighteenth convex lens (5076), the light pulse is transmitted to a seventh grating (5078) through the eighteenth convex lens (5077), the light pulse is reflected to an eighth grating (5079) through the seventh grating (5078), the light pulse is reflected to a second rooftop mirror (5080) through the eighth grating (5079), the light pulse is reflected back to a seventh grating (5078) through an input route, the seventh grating (5078) transmits the light pulse to a sixty mirror (5083) through a sixty-second mirror (5082), the light pulse is transmitted to a sixty-third mirror (5081) through a sixty-third mirror (5082), the light pulse is transmitted to a sixty-third mirror (5081) through a sixty-fourth mirror (5081), the light pulse reflected from the thirteenth dichroic mirror (5085) is incident to the first thin film polarizer (5087) through the eighth half wave plate (5086), the parallel polarized light pulse transmitted and output through the first thin film polarizer (5087) is incident to the sixty-five reflecting mirror (5107), the light pulse is reflected to the first dichroic mirror (5023) through the sixty-five reflecting mirror (5107), the vertical polarized light pulse reflected by the first thin film polarizer (5087) is incident to the second thin film polarizer (5088), and the light pulse is reflected by the second thin film polarizer (5088) and then is transmitted to the ninth half The wave plate (5089) and the second erbium-doped fiber (5090) are transmitted to a sixty-sixth reflecting mirror (5091), the light pulse is reflected to a fourth dichroic mirror (5035) by the sixty-sixth reflecting mirror (5091), the light pulse reflected by the fourth dichroic mirror (5035) is fused with the light pulse transmitted by the fourth dichroic mirror (5035) after entering the fourth dichroic mirror (5035) through a thirty-ninth reflecting mirror (5034), and the fused light pulse enters a second KTiAsO 4 A crystal (5036), the light pulse output from the thirteenth dichroic mirror (5085) is transmitted to the tenth half-wave plate (5093) through the sixty-seventh reflecting mirror (5092), the light pulse is incident to the third thin film polarizer (5094) through the tenth half-wave plate (5093), the parallel polarized light pulse transmitted through the third thin film polarizer (5094) is incident to the sixty-eighth reflecting mirror (5108), the light pulse is reflected to the seventh dichroic mirror (5056) through the sixty-eighth reflecting mirror (5108), the vertical polarized light pulse reflected by the third thin film polarizer (5094) is incident to the fourth thin film polarizer (5095), the light pulse is reflected by the fourth thin film polarizer (408) 0 and then transmitted to the sixty-ninth reflecting mirror (5098) through the eleventh half-wave plate (5096) and the third erbium-doped optical fiber (5097), the light pulse is reflected to the tenth dichroic mirror (5070) through the sixty-ninth reflecting mirror (5098), and finally the two identical light pulses incident to the prism (5099) are transmitted to the seventeenth reflecting mirror (5101) through the seventy-seventh reflecting mirror (5100) 2 Lens (5102), two light pulses pass through CaF 2 The lens (5102) outputs the fused light;
the polarized pulse coherent superposition module (6) has an optical path structure that an optical pulse is incident to a fifth polarized beam splitter (601), the optical pulse is output from an output end of the fifth polarized beam splitter (601) in a vertical incidence direction, the optical pulse is reflected to a seventy-third mirror (603) through a seventy-second mirror (602), is reflected to a seventy-fourth mirror (604) through the seventy-fourth mirror (604), is reflected to a seventy-fifth mirror (605) through the seventy-fifth mirror (604), is reflected back to the fifth polarized beam splitter (601) through the seventy-fifth mirror (605), is output from an output end of the fifth polarized beam splitter (601) in a parallel incidence direction, is output from the fifth polarized beam splitter (601), is transmitted to a sixth polarized beam splitter (607) through a twelfth half-wave plate (606), is transmitted to a seventy-sixth mirror (608) along an output end of the sixth polarized beam splitter (607) in a direction vertical to the incidence direction, is reflected to a seventy-sixth mirror (608) through the seventy-sixth mirror (609), is reflected to the seventy-seventh mirror (609) through the seventy-fifth mirror (607), is reflected to the seventy-fifth mirror (607) and is output from the seventy-eighth mirror (607) through the eighth mirror (607) to the eighth mirror (607) through the eighth mirror (607) after being output from the output end of the fifth polarizing beam splitter (601) in a parallel incidence direction to the eighth polarized beam splitter (601) through the seventh mirror) and the eighth mirror (610), the light pulse is transmitted to a thirteenth half wave plate (612) through a sixth polarization beam splitter, is transmitted to a seventh polarization beam splitter (613) through the thirteenth half wave plate (612), and is finally output by the seventh polarization beam splitter (613);
The second-order pulse width compression module (7) has a beam structure that light pulses are incident on a ninth grating (701), light pulses output by the ninth grating (701) are incident on a tenth grating (705) through a nineteenth convex lens (702), an optical slit (703) and a twenty-first convex lens (704), light pulses output by the tenth grating (705) are incident on an eighteenth mirror (707) through an eighth quarter-wave plate (706), the light pulses return to the ninth grating (701) along the original path after reaching the eighteenth mirror (707), the light pulses output by the ninth grating (701) are incident on an eleventh grating (709) through a thermally filled hollow core optical fiber (708), the light pulses are reflected on a twelfth grating (710) through the eleventh grating (709), are reflected on a first fused silica plate (711) through the twelfth grating (710), the light pulses are incident on a first chirped mirror (713) through the first fused silica plate (711) and a BBO crystal (713), the light pulses are reflected on a second chirped mirror (714) through the second chirped mirror (714) and back to the second chirped mirror (714) through the second chirped mirror (713), the light pulses are reflected back to the second chirped mirror (714) through the second chirped mirror (713) and the second chirped mirror (713), the light pulse is transmitted to an eighty-first reflecting mirror (715) through a second chirp reflecting mirror (714), reflected to a second fused silica plate (716) through the eighty-first reflecting mirror (715), incident to an aluminum D-shaped split mirror (717) through the second fused silica plate (716), incident to an eighty-second reflecting mirror (718) through the D-shaped split mirror (717), reflected to an eighty-third reflecting mirror (719) through the eighty-second reflecting mirror (718), reflected to a second concave mirror (720) through the eighty-third reflecting mirror (719), transmitted to a third fused silica plate (723) through the second concave mirror (720), transmitted to a eighty-fourth reflecting mirror (721) through the other end of the D-shaped split mirror (717), reflected to an eighty-fifth reflecting mirror (722) through the eighth-fifth reflecting mirror (722), transmitted to a third fused silica plate (723) through the second concave mirror (720), and finally transmitted to a third fused silica plate (723) through a third residual quartz lens (723) through the third fused silica plate (723).
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| CN202310013632.0A CN116260545A (en) | 2023-01-05 | 2023-01-05 | Ultrashort pulse source for dense wavelength division multiplexing system |
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