CN111725691A - Thulium-doped optical fiber optical frequency comb system based on nonlinear polarization rotation mode locking - Google Patents
Thulium-doped optical fiber optical frequency comb system based on nonlinear polarization rotation mode locking Download PDFInfo
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- CN111725691A CN111725691A CN202010493690.4A CN202010493690A CN111725691A CN 111725691 A CN111725691 A CN 111725691A CN 202010493690 A CN202010493690 A CN 202010493690A CN 111725691 A CN111725691 A CN 111725691A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08013—Resonator comprising a fibre, e.g. for modifying dispersion or repetition rate
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/11—Mode locking; Q-switching; Other giant-pulse techniques, e.g. cavity dumping
- H01S3/1106—Mode locking
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1616—Solid materials characterised by an active (lasing) ion rare earth thulium
Abstract
The invention discloses a thulium-doped optical fiber optical frequency comb system based on nonlinear polarization rotation mode locking, which comprises an optical fiber laser module, a pulse repetition frequency locking module, a power adjusting module and a carrier envelope zero-frequency locking module. The invention has the advantages that: the thulium-doped optical fiber frequency comb system can output a low-noise wide-spectrum optical frequency comb, the optical frequency comb has high repetition frequency, the repetition frequency can be accurately controlled, the output power is controllable, the system structure is simple, and the stability is good.
Description
Technical Field
The invention belongs to the technical field of ultrafast optics, and particularly relates to a thulium-doped optical fiber optical frequency comb system based on nonlinear polarization rotation mode locking.
Background
Since the first ruby laser in the world of the sixties of the last century emerged, the laser technology developed rapidly in more than half a century, and each development of the laser technology from a solid laser to a fiber laser promoted the progress of science and technology. With the continuous development of the ultrafast laser technology, the ultrafast laser technology has the advantage of being unique in the field of precision measurement, and especially the emergence of the femtosecond optical frequency comb technology breaks through the existing measurement scale continuously, thereby having great contribution to the field of precision measurement.
An optical frequency comb, called an optical comb for short, is represented by comb teeth at equal intervals in a frequency domain, the intervals of the comb teeth are the repetition frequency of a mode-locked laser, and the repetition frequency of the mode-locked laser and the initial phase of carrier envelope are detected and locked by a precise time-frequency domain control technology, so that a stable optical comb can be obtained, and the frequency can be accurately measured. An optical frequency comb, as a novel measurement technology different from the traditional precision measurement, realizes the link between the optical frequency and the radio frequency, and is used for precision spectroscopy. The method has important significance in the fields of precision measurement such as basic physical constant measurement, optical frequency measurement, optical atomic clocks and the like.
The ultrafast mode-locked laser is used as a seed source of an optical frequency comb, and the main principle of the generation of the ultrafast mode-locked laser is a mode-locked laser technology, and the mode-locked technology is divided into an active mode-locked technology and a passive mode-locked technology. Active mode locking techniques generally require the addition of an "optical switch" as a modulation device in the optical resonator, and use amplitude modulation or phase modulation to achieve mode locking. The passive mode locking technology includes nonlinear polarization rotation mode locking, nonlinear ring mirror mode locking and saturable absorber mode locking. Compared with active mode locking, the laser pulse generated by the passive mode locking technology has low noise and high repetition frequency, does not need external modulation and is easy to integrate. The traditional thulium-doped fiber laser is mainly generated based on a saturable absorption effect, the output pulse of the traditional thulium-doped fiber laser is limited by a saturable absorber in a cavity, and the low-noise high-power pulse output is difficult to realize. The nonlinear polarization rotation mode locking involved in the invention does not need to add a saturable absorber in a cavity, and has small phase noise, narrow output pulse width and extremely wide spectrum. The limit of the traditional technology is broken through to a certain extent.
In recent years, optical frequency comb technology has played an important role in the fields of precision measurement, optical atomic clocks, and the like, in lock with the development of precision measurement technology. Wherein, the erbium-doped optical comb and the ytterbium-doped optical comb have important application in the fields of molecular measurement, mid-infrared optical comb generation, precise distance measurement and the like. The laser near 2000nm generated by the thulium-doped fiber laser has important application prospects in the fields of medical treatment, communication, laser radar and the like, and can be used as a seed source of the intermediate infrared optical comb by combining a nonlinear frequency generation technology. The optical comb system is required to have smaller phase noise by the technology of precision measurement, molecular gas measurement and mid-infrared optical comb, and the traditional thulium-doped optical fiber laser based on a saturable absorber is difficult to meet the requirements of the applications.
At present, most thulium-doped optical combs used for molecular spectrum measurement and other applications are based on mode locking of a semiconductor saturable absorption mirror, are limited by relaxation time of the semiconductor saturable absorption mirror, have limited output pulse width and phase noise, have low mode locking threshold of a laser, and are difficult to realize high-power laser pulse output.
Disclosure of Invention
The thulium-doped fiber optical frequency comb system obtains seed light with high repetition frequency by utilizing nonlinear polarization rotation mode locking, accurately locks the repetition frequency and carrier envelope zero frequency of a mode-locked fiber laser through a phase-locked loop technology and a carrier envelope zero frequency locking module, and finally improves the power of the optical frequency comb through a fiber amplifier, so that the thulium-doped fiber optical frequency comb system can be directly applied to working occasions such as laboratories, outdoors and the like.
The purpose of the invention is realized by the following technical scheme:
a thulium-doped optical fiber optical frequency comb system based on nonlinear polarization rotation mode locking is characterized by comprising an optical fiber laser module, a pulse repetition frequency locking module, a power regulating module and a carrier envelope zero-frequency locking module, the fiber laser module outputs mode-locked pulse laser, the pulse repetition frequency locking module and the fiber laser module form a loop, the pulse repetition frequency locking module locks the pulse laser, the input end of the power adjusting module is connected with the output end of the fiber laser module, the power adjusting module improves the seed output power, the carrier envelope zero-frequency locking module forms a loop with the optical fiber laser module and the power adjusting module, and the carrier envelope zero locking module locks the carrier envelope zero frequency of the pulse laser.
The fiber laser module is a half-space half-fiber structure fiber laser provided with a gain fiber, piezoelectric ceramics and a dispersion regulator.
The fiber laser module is an all-fiber structure fiber laser provided with a gain fiber, piezoelectric ceramics and a dispersion regulator.
The dispersion adjuster is one of a grating, a prism and an optical fiber, and adjusts intra-cavity dispersion so that the pulse laser achieves positive dispersion, negative dispersion and zero dispersion for forming mode locking.
The gain optical fiber is one of a polarization-maintaining thulium-doped gain optical fiber, a non-polarization-maintaining thulium-doped gain optical fiber and a holmium-thulium-co-doped gain optical fiber.
The power regulating module is an optical fiber amplifier or a combination body formed by cascading the optical fiber amplifier and at least one stage of F-P cavity.
The optical fiber amplifier is a chirped pulse optical fiber amplifier or a self-similar optical fiber amplifier.
The pulse repetition frequency locking module is composed of a reference signal source, a detector, a frequency mixer and a filtering amplification circuit, and realizes cavity length control by controlling the length of piezoelectric ceramics in the fiber laser module so as to lock the pulse laser repetition frequency.
The carrier envelope zero frequency locking module is an f-2f frequency locking system or a 2f-3f frequency locking system.
The invention has the advantages that: (1) the thulium-doped optical fiber optical frequency comb system based on nonlinear polarization rotation mode locking directly outputs the thulium-doped optical fiber optical frequency comb with low noise through amplification of pulse laser power and accurate locking of frequency. (2) The invention combines high-power pumping, and controls the intracavity dispersion regulator to ensure that the resonant cavity achieves the positive dispersion, negative dispersion and zero dispersion states capable of realizing stable mode locking, thereby realizing the thulium-doped optical fiber optical frequency comb with low noise and wide spectrum. (3) The invention adopts the fiber laser based on nonlinear polarization rotation mode locking as the oscillation stage, has simple system structure, small occupied space, low investment cost and convenient maintenance of the system, breaks through the problems of low power threshold, large phase noise and the like of the traditional fiber laser using a saturable absorber mode locking as the oscillation stage, and leads the thulium-doped fiber optical frequency comb system to be more integrated and portable, and has better system stability. (4) The invention adopts the optical fiber amplifier based on the chirped pulse amplification technology or the optical fiber amplifier based on the self-similar amplification technology, and can adjust the pulse width of the laser in the amplification process. (5) The invention is based on the optical fiber structure, the system structure is compact, the repetition frequency of the optical frequency comb is high, the repetition frequency can be accurately controlled, and the output power can be controlled.
Drawings
FIG. 1 is a schematic structural diagram of a thulium-doped fiber optical frequency system based on nonlinear polarization rotation mode locking according to the present invention;
fig. 2 is a structural diagram of a thulium-doped fiber optical frequency comb system employing a half-space and half-fiber structure in embodiment 1;
fig. 3 is a structural diagram of a thulium-doped fiber optical frequency comb system in embodiment 2, which employs an all-fiber structure.
Detailed Description
The features of the present invention and other related features are described in further detail below by way of example in conjunction with the following drawings to facilitate understanding by those skilled in the art:
as shown in fig. 1-3, the respective symbols in the drawings are:
the fiber laser comprises a fiber laser module 1, a fiber collimator 101, a half-wave plate 102, a quarter-wave plate 103, a beam splitter 104, a first piezoelectric ceramic 105, an optical isolator 106, a first thulium-doped fiber 107, a first pump source 108, a first dispersion adjuster 109, a second pump source 111, a wavelength division multiplexer 112, a second optical isolator 113, a fiber coupler 114, a second piezoelectric ceramic 115, a second thulium-doped fiber 116, a polarization controller 117, and a second dispersion adjuster 118;
a power adjusting module 2, a chirped pulse CPA fiber amplifier 201, a chirped pulse fiber amplifier 202;
the pulse repetition frequency locking device comprises a pulse repetition frequency locking module 3, a laser pulse detector 301, a mixer 302, a filtering and amplifying circuit 303 and a signal generator 304;
the device comprises a carrier envelope zero-frequency locking module 4, a photonic crystal fiber 401, a reflector 402, a frequency doubling crystal 403, a delayer 404, a signal detection and processor 405 and a dichroic mirror 406.
Example 1: as shown in fig. 1 and 2, the present embodiment specifically relates to a thulium-doped fiber optical frequency comb system based on nonlinear polarization rotation mode locking, and the structure and principle of the system are as follows: the thulium-doped optical fiber optical frequency comb system comprises an optical fiber laser module 1, a pulse repetition frequency locking module 3, a power adjusting module 2 and a carrier envelope zero-frequency locking module 4. The fiber laser module 1 outputs mode-locking pulse laser with high repetition frequency, the output end of the fiber laser module 1 is connected with the input end of the pulse repetition frequency locking module 3, and a feedback signal generated by the pulse repetition frequency locking module 3 enters the input end of the fiber laser module 1 from the output end of the pulse repetition frequency locking module 3, so that a loop is formed. The output end of the fiber laser module 1 is also connected with the input end of the power adjusting module 2, the output end of the power adjusting module 2 is connected with the input end of the carrier envelope zero-frequency locking module 4, and a control signal generated by the carrier envelope zero-frequency locking module 4 enters the fiber laser module 1 to form a loop. Therefore, through nonlinear polarization rotation mode locking, the thulium-doped optical fiber optical frequency comb pulse output with low noise and controllable repetition frequency is provided.
As shown in fig. 1 and 2, the fiber laser module 1 in this embodiment is a fiber laser with a half-space and half-fiber structure, and the pulse laser wavelength generated by the fiber laser is 1950 nm. The fiber laser module 1 includes a fiber collimator 101, a half-wave plate 102, a quarter-wave plate 103, a beam splitter 104, a first piezoelectric ceramic 105, an optical isolator 106, a first thulium doped fiber 107, a first pump source 108, and a first dispersion adjuster 109. The first pump source 108 injects 1550nm pump into the ring cavity of the fiber laser, the laser output by the high-concentration first thulium-doped fiber 107 in the ring cavity passes through the fiber collimator 101, the half-wave plate 102, the quarter-wave plate 103 and the beam splitter 104 in sequence, the laser in one polarization state which passes through the beam splitter 104 is directly output, the laser in the other polarization state is reflected by the beam splitter 104 and then continues to pass through the quarter-wave plate 103 and the first dispersion adjuster 109, and is reflected by the first piezoelectric ceramic 105 with a high reflection mirror, and returns to the quarter wave plate 103 again, at this time, the polarization state of the laser changes, the propagation direction is changed by the beam splitter 104, and then the laser passes through the polarization-dependent optical isolator 106, the quarter wave plate 103, and finally is coupled into the optical fiber again by the optical fiber collimator 101, the resonant cavity forms the condition of nonlinear polarization rotation mode-locking pulse laser after completing a complete circular path. In order to obtain mode-locked pulse laser with high repetition frequency, high-concentration ytterbium-doped optical fiber and integrated optical element are adopted.
As shown in fig. 1 and 2, the pulse repetition frequency locking module 3 includes a laser pulse detector 301, a mixer 302, a filter amplifier circuit 303, and a signal generator 304. The optical path of the resonant cavity is controlled to be 0.8m, the input end of the laser pulse detector 301 receives a high repetition frequency (250 MHz) mode-locked laser pulse output by the fiber laser module 1, the obtained mode-locked pulse laser signal is input to the laser pulse detector 301 in the pulse repetition frequency locking module 3 to be detected to obtain a pulse signal, the pulse signal and a standard signal generated by the signal generator 304 enter the mixer 302 together to generate a low-frequency error signal, the low-frequency error signal passes through the filtering and amplifying circuit 303 to generate a feedback control signal, and the feedback control signal controls the first piezoelectric ceramic 105 in the fiber laser module 1, so that the cavity length of the resonant cavity is adjusted, and the pulse repetition frequency is accurately locked, in this embodiment, the repetition frequency of the pulse laser can be locked to 10 MHz.
As shown in fig. 1 and 2, after the repetition frequency locking, the pulse laser is input into a power adjusting module 2, the power adjusting module 2 in this embodiment is a chirped pulse CPA fiber amplifier 201, the carrier envelope zero-frequency locking module 4 is an f-2f system, and the carrier envelope zero-frequency locking module 4 includes a photonic crystal fiber 401, a mirror 402, a frequency doubling crystal 403, a delay 404, a signal detection and processor 405, and a dichroic mirror 406. A part of amplified pulse signals of the pulse laser are input into the carrier envelope zero-frequency locking module 44, the pulse laser is widened to an octave through the photonic crystal fiber 401 after passing through the power adjusting module 2, then the pulse laser is divided into two paths through the dichroic mirror 406, one path of the pulse laser with the wavelength of 2200nm is introduced into the frequency doubling crystal 403, and the light path direction is adjusted through the reflector 402; and the other path of the pulse laser with the wavelength of 1100nm, which is filtered and transmitted, is subjected to optical path adjustment through the delayer 404, the two paths of pulse laser are shot into the signal detection and processor 405 to carry out beat frequency, and the signal detection and processor 405 detects and processes beat frequency signals, so that feedback control signals are generated to control pumping current, and accurate locking of pulse signal carrier envelope zero frequency is realized. The repetition frequency of the finally output high-power optical frequency comb is 250MHz, the locking precision of the repetition frequency reaches mHz, and the carrier envelope zero frequency is also locked at the same time, so that the thulium-doped optical fiber frequency comb with low noise and high power is directly output.
Example 2: as shown in fig. 1 and 3, the present embodiment specifically relates to a thulium-doped fiber optical frequency comb system based on nonlinear polarization rotation mode locking, and the structure and principle of the system are as follows: the thulium-doped optical fiber optical frequency comb system comprises an optical fiber laser module 1, a pulse repetition frequency locking module 3, a power adjusting module 2 and a carrier envelope zero-frequency locking module 4. The fiber laser module 1 outputs mode-locking pulse laser with high repetition frequency, the output end of the fiber laser module 1 is connected with the input end of the pulse repetition frequency locking module 3, and a feedback signal generated by the pulse repetition frequency locking module 3 enters the input end of the fiber laser module 1 from the output end of the pulse repetition frequency locking module 3, so that a loop is formed. The output end of the fiber laser module 1 is also connected with the input end of the power adjusting module 2, the output end of the power adjusting module 2 is connected with the input end of the carrier envelope zero-frequency locking module 4, and a control signal generated by the carrier envelope zero-frequency locking module 4 enters the fiber laser module 1 to form a loop. Therefore, through nonlinear polarization rotation mode locking, the thulium-doped optical fiber optical frequency comb pulse output with low noise and controllable repetition frequency is provided.
As shown in fig. 1 and 3, the pulse laser wavelength generated in this embodiment is 1950nm, the fiber laser module 1 is an all-fiber structure, and the fiber laser module 1 includes a second pump source 111, a wavelength division multiplexer 112, a second optical isolator 113, a fiber coupler 114, a second piezoelectric ceramic 115, a second thulium-doped fiber 116, a polarization controller 117, and a second dispersion adjuster 118. The second pump source 111 injects 1550nm pump into the ring cavity, the laser generated by the gain fiber 116 in the cavity passes through the wavelength division multiplexer 112, the polarization-related second optical isolator 113, the fiber coupler 114, the second thulium-doped fiber 116, the polarization controller 117, and the second dispersion adjuster 118 in sequence to complete a complete ring path, and the length of the fiber is fine-tuned by using the second piezoelectric ceramic 115, such a resonant cavity constitutes a condition for generating nonlinear polarization rotation mode-locked pulse laser. In this embodiment, the pulse repetition frequency locking module 3 includes a detector 301, a mixer 302, a filtering and amplifying circuit 303, and a signal generator 304, controls the optical length of the resonant cavity to be 1.0m, under low power pumping, mode-locked pulse laser with repetition frequency of 200MHz can be obtained, the power of the pump 111 is increased to 1.5W, the obtained mode-locked laser pulse signal is input into the pulse repetition frequency locking module 3, the pulse signal obtained by the detector 301 and the standard signal generated by the signal generator 304 enter the mixer 302, then the filtered wave amplifying circuit 303 generates a feedback control signal, this signal controls the second piezo-ceramic 115 in the fibre laser module 1, which controls the fibre length change, therefore, the cavity length of the resonant cavity is adjusted, the pulse repetition frequency is accurately locked, and the pulse laser repetition frequency can be locked to 10mHz in the embodiment.
As shown in fig. 1 and 3, after the repetition frequency locking, the pulse laser is input into a power adjusting module 2, the power adjusting module 2 in this embodiment is a chirped pulse fiber amplifier 202, and the carrier envelope zero-frequency locking module 4 includes a photonic crystal fiber 401, a mirror 402, a frequency doubling crystal 403, a retarder 404, a signal detection and processor 405, and a dichroic mirror 406. Pulse laser is amplified by a chirped pulse fiber amplifier 202, then a part of pulse signals are introduced and input into a carrier envelope zero-frequency locking module 4, the carrier envelope zero-frequency locking module 4 in the embodiment is an f-2f system, after passing through a power adjusting module 2, pulse light is broadened to an octave by a photonic crystal fiber 401, then the pulse light is divided into two paths by a dichroic mirror 406, one path of the pulse light with the wavelength of 2200nm is introduced into a frequency doubling crystal 403, and the light path direction is adjusted by a reflector 402; and the other path of pulse light with the wavelength of 1100nm, which is transmitted through filtering, is adjusted by the optical path through the delayer 404, the two paths of pulse light are taken into the signal detection and processor 405 to carry out beat frequency, and the signal detection and processor 405 detects and processes beat frequency signals, so that feedback control signals are generated to control the pumping current, and the accurate locking of the pulse signal carrier envelope zero frequency is realized. The repetition frequency of the finally output high-power optical frequency comb is 250MHz, the locking precision of the repetition frequency reaches mHz, and the carrier envelope zero frequency is also locked at the same time, so that the thulium-doped optical fiber frequency comb with low noise and high power is directly output.
Claims (9)
1. A thulium-doped optical fiber optical frequency comb system based on nonlinear polarization rotation mode locking is characterized by comprising an optical fiber laser module, a pulse repetition frequency locking module, a power regulating module and a carrier envelope zero-frequency locking module, the fiber laser module outputs mode-locked pulse laser, the pulse repetition frequency locking module and the fiber laser module form a loop, the pulse repetition frequency locking module locks the pulse laser, the input end of the power adjusting module is connected with the output end of the fiber laser module, the power adjusting module improves the seed output power, the carrier envelope zero-frequency locking module forms a loop with the optical fiber laser module and the power adjusting module, and the carrier envelope zero locking module locks the carrier envelope zero frequency of the pulse laser.
2. The thulium-doped fiber optical frequency comb system based on nonlinear polarization rotation mode locking according to claim 1, wherein the fiber laser module is a half-space half-fiber structure fiber laser provided with a gain fiber, a piezoelectric ceramic and a dispersion adjuster.
3. The thulium-doped fiber optical frequency comb system based on nonlinear polarization rotation mode locking according to claim 1, wherein the fiber laser module is an all-fiber laser with gain fiber, piezoelectric ceramic and dispersion adjuster.
4. The thulium-doped fiber optical frequency comb system according to claim 2 or 3, wherein the dispersion adjuster is one of a grating, a prism, and a fiber, and the dispersion adjuster adjusts the intracavity dispersion to achieve positive dispersion, negative dispersion, and zero dispersion for mode locking of the pulsed laser.
5. The thulium-doped fiber optical frequency comb system based on nonlinear polarization rotation mode locking according to claim 2 or 3, wherein the gain fiber is one of a polarization-maintaining thulium-doped gain fiber, a non-polarization-maintaining thulium-doped gain fiber, and a holmium-thulium co-doped gain fiber.
6. The thulium-doped fiber optic frequency comb system according to claim 1, wherein the power adjusting module is a fiber amplifier or a combination of a fiber amplifier and at least one cascaded F-P cavity.
7. The thulium-doped fiber optic frequency comb system according to claim 6, wherein the fiber amplifier is a chirped pulse fiber amplifier or a self-similar fiber amplifier.
8. The thulium-doped fiber optic frequency comb system based on nonlinear polarization rotation mode locking according to claim 1, wherein the pulse repetition frequency locking module is composed of a reference signal source, a detector, a mixer, and a filter amplifier circuit, and the pulse repetition frequency locking module realizes cavity length control by controlling the length of the piezoelectric ceramic in the fiber laser module to lock the pulse laser repetition frequency.
9. The thulium-doped fiber optic frequency comb system based on nonlinear polarization rotation mode locking according to claim 1, wherein the carrier-envelope zero-frequency locking module is an f-2f frequency locking system or a 2f-3f frequency locking system.
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| CN116009249A (en) * | 2023-03-27 | 2023-04-25 | 济南量子技术研究院 | Automatic debugging method and system for optical frequency comb mode locking |
| CN116009249B (en) * | 2023-03-27 | 2023-06-30 | 济南量子技术研究院 | Automatic debugging method and system for optical frequency comb mode locking |
| CN117031856A (en) * | 2023-09-01 | 2023-11-10 | 上海频准激光科技有限公司 | Control device and method for optical pulse output sequence |
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