CN109286125B - Efficient chirped pulse amplification system - Google Patents
Efficient chirped pulse amplification system Download PDFInfo
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- CN109286125B CN109286125B CN201811363653.0A CN201811363653A CN109286125B CN 109286125 B CN109286125 B CN 109286125B CN 201811363653 A CN201811363653 A CN 201811363653A CN 109286125 B CN109286125 B CN 109286125B
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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
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10023—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by functional association of additional optical elements, e.g. filters, gratings, reflectors
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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
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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Abstract
The invention belongs to the technical field of high-energy short pulse laser, and relates to a high-efficiency chirped pulse amplification system, wherein a seed source is connected with a first double-range generation device, the first double-range generation device is respectively connected with a dispersion widening device and an amplification device, the amplification device is connected with a second double-range generation device, the second double-range generation device is connected with a dispersion compression device, the utilization rate of the widening/compression device is improved by utilizing the double-range generation device, multiple pulse widening amount and compression amount are introduced, the peak power of laser pulses in an optical fiber amplification system is greatly reduced, and the peak power is lower than the nonlinear threshold of an optical fiber, so that the laser output with high pulse energy is obtained, the utilization rate of a widening/compression device is high, the system structure is compact and simple, and the cost is low.
Description
The technical field is as follows:
the invention belongs to the technical field of high-energy short pulse laser, and relates to a high-efficiency chirped pulse amplification system.
Background art:
the high-pulse-energy fiber laser system has important application requirements in the fields of industry, national defense and scientific research. However, as the peak power of the pulse increases, the nonlinear threshold of the fiber in the amplifier severely limits the laser output at high pulse energies.
The nonlinear threshold of the large-core optical fiber is high, the problem of high energy output can be well solved, but the large-core optical fiber is often accompanied by more laser modes, so that the quality of light beams is poor. At present, a Chirped Pulse Amplification (CPA) technology is an effective means for suppressing a nonlinear effect in an amplification process, in order to obtain sufficient energy extraction and simultaneously ensure compressibility of pulses, a great pulse stretching amount and a great pulse compression amount are often required, higher requirements are put on a pulse stretcher and a pulse compressor, such as adoption of a longer-distance grating pair, a longer stretched optical fiber, a chirped bragg grating (CVBG) with larger dispersion and the like, and the cost of the pulse stretcher and the compressor is in direct proportion to the dispersion amount provided by the pulse stretcher and the compressor, so that the conventional chirped pulse amplification system is high in cost and large in size, and application of the conventional chirped pulse amplification system is limited. Therefore, there is a need for a low-cost, small-sized chirped pulse amplification system with high single pulse energy and narrow pulse width.
The invention content is as follows:
the invention aims to overcome the defects in the prior art, and seeks to design and provide a high-efficiency chirped pulse amplification system, wherein a double-range generating device is adopted to enable a dispersion broadening/compressing device to be utilized for multiple times (more than or equal to 2 times), so that the pulse compressibility is ensured, and the single pulse energy is greatly improved.
In order to achieve the purpose, the main body structure of the high-efficiency chirped pulse amplification system comprises a seed source, a first double-range generating device, a dispersion broadening device, an amplifying device, a second double-range generating device and a dispersion compressing device, wherein the seed source is connected with the first double-range generating device, the first double-range generating device is respectively connected with the dispersion broadening device and the amplifying device, the amplifying device is connected with the second double-range generating device, the second double-range generating device is connected with the dispersion compressing device, and laser pulses output by the seed source pass through the first double-range generating device and then undergo pulse broadening through the dispersion broadening device for multiple times (more than or equal to 2 times); the broadened laser pulse returns to the first double-range generating device and enters the amplifying device for pulse amplification; after the amplified laser pulse passes through the second multiple-range generating device, the amplified laser pulse is subjected to pulse compression for a plurality of times (more than or equal to 2 times) through a dispersion compression device; and returning the compressed laser pulse to the second double-stroke generating device for laser output.
The first double-range generating device is a circulator or a 2 x 2 coupler and the like.
The dispersion broadening device is an optical fiber, a prism pair, a grating pair, an optical fiber grating or a chirped Bragg grating (CVBG) and the like.
The second octave generating device is a plurality of combinations of a polarization beam splitter Prism (PBS), a quarter-wave plate and a right-angle prism.
The dispersion compression device is an optical fiber, a prism pair, a grating pair, an optical fiber grating or a chirped Bragg grating (CVBG) and the like.
The first double-range generating device and the second double-range generating device can provide double ranges such as a second double range, a fourth double range, a sixth double range, an eighth double range, a tenth double range and the like, theoretically, the pulse can be widened to be infinite wide, and the peak power of laser pulses in an optical fiber amplifying system is reduced exponentially and is lower than the nonlinear threshold of an optical fiber.
Compared with the prior art, the invention utilizes the double-range generating device, improves the utilization rate of the stretching/compressing device, introduces the pulse stretching amount and the pulse compressing amount which are multiple times (more than or equal to 2 times), greatly reduces the peak power of the laser pulse in the optical fiber amplifying system, and leads the peak power to be lower than the nonlinear threshold of the optical fiber, thereby obtaining the laser output with high pulse energy, and the stretching/compressing device has high utilization rate, compact and simple system structure and low cost.
Description of the drawings:
fig. 1 is a schematic structural diagram of a chirped pulse amplification system according to the present invention.
Fig. 2 is a schematic structural diagram of an implementation manner of the first octave generating device according to embodiment 1 of the present invention.
Fig. 3 is a schematic structural diagram of an implementation manner of the first octave generating device according to embodiment 2 of the present invention.
Fig. 4 is a schematic structural diagram of an implementation manner of the second multiple distance generating device according to embodiment 1 of the present invention.
Fig. 5 is a schematic structural diagram of an implementation manner of the second multiple distance generating device according to embodiment 3 of the present invention.
Fig. 6 is a schematic structural diagram of a high-efficiency chirped pulse amplification system according to embodiment 1 of the present invention.
Fig. 7 is a schematic structural diagram of an implementation manner of the second multiple distance generating device according to embodiment 4 of the present invention.
The specific implementation mode is as follows:
the invention is further illustrated by the following examples in conjunction with the accompanying drawings.
The main structure of the high-efficiency chirped pulse amplification system is shown in fig. 1, and includes a seed source, a first multiple-range generating device, a dispersion broadening device, an amplifying device, a second multiple-range generating device and a dispersion compressing device, where the seed source is connected to the first multiple-range generating device, the first multiple-range generating device is connected to the dispersion broadening device and the amplifying device, the amplifying device is connected to the second multiple-range generating device, the second multiple-range generating device is connected to the dispersion compressing device, and a laser pulse output by the seed source passes through the first multiple-range generating device and then undergoes pulse broadening through the dispersion broadening device for multiple times (not less than 2 times); the broadened laser pulse returns to the first double-range generating device and enters the amplifying device for pulse amplification; after the amplified laser pulse passes through the second multiple-range generating device 2, the amplified laser pulse is subjected to pulse compression for a plurality of times (more than or equal to 2 times) through a dispersion compression device; and returning the compressed laser pulse to the second double-stroke generating device for laser output.
Example 1:
the main structure of the high-efficiency chirped pulse amplification system of the embodiment is shown in fig. 6, wherein a seed source adopts a laser light source capable of emitting pulses with a central wavelength of 1030nm, a repetition frequency of 200kHz, a pulse width of 6ps and a power of 12.45 mW; the central wavelength of the filter 12 is 1030nm, and the bandwidth is 6 nm; the dispersion broadening device uses a broadened optical fiber 12, which is an optical fiber PM980 with a length of 1.5km and a dispersion coefficient of 25ps2(ii) km; the amplifying device adopts an amplifier 16 with three-stage amplification; the dispersion compression device adopts Chirped Volume Bragg Grating (CVBG)20 with central wavelength of 1030nm, bandwidth of 8nm, and dispersion amount of-33.8 ps2The first double-range generating device and the second double-range generating device both adopt double-range generating devices, wherein the first double-range generating device adopts a circulator 13, the second double-range generating device adopts a combination of a polarization beam splitter prism 18, a quarter wave plate 19 and a right-angle prism 21, and laser pulses generated by a seed source 11 enter a first port of the circulator 13 after passing through a filter 12; the widening optical fiber 14 is connected with a second port of the circulator 13, and laser passes through the widening optical fiber 14 twice through a polarization maintaining reflector 15; and then returns to the third port of the circulator 13 to enter the amplifier 16; the half-wave plate 17 is used for adjusting the polarization state of the output light of the amplifier 16, so that the output light enters the polarization beam splitting prism 18 and the quarter-wave plate 19 as far as possible; performing primary compression in Chirped Volume Bragg Grating (CVBG)20, and returning a reflected light beam in an original path; the reflected light beam is obtained via the polarization beam splitter prism 18
Forming parallel beams in a right-angle prism 21
Reflects back to a Chirped Volume Bragg Grating (CVBG)20 via a polarization splitting prism 18Laser beam reflected after secondary compression
Passes through a polarizing beam splitter prism 18, which transmits the light beam
And is reflected off the mirror 22.
The first double-range generating device 1 of this embodiment is implemented as shown in fig. 2, where an incident light beam (i) passes through a first port of a circulator 1, a second port is connected to a broadening fiber 2, a laser beam (ii) after first broadening passes through a polarization maintaining mirror 3 and returns to the broadening fiber 2, and a laser beam (iv) after second broadening passes through a third port of the circulator 1 and is output, that is, a laser beam.
The second magnification generating apparatus 2 of this embodiment is implemented as shown in fig. 4, in which an incident beam (i) is transmitted through a polarization beam splitter 5, and then passes through a quarter-wave plate 6 to obtain a laser beam (ii), and then enters a Chirped Volume Bragg Grating (CVBG)7 to be compressed for the first time, and the reflected light returns in the original path, and then passes through the polarization beam splitter 5 to obtain a reflected light beam (iii), and a parallel beam (ii) is formed in a right-angle prism 8, and then is reflected back to the Chirped Volume Bragg Grating (CVBG)7 through the polarization beam splitter 5, and the reflected laser beam (iii) after the second compression is transmitted through the polarization beam splitter 5 and output, i.e., the laser beam (ii.
In this embodiment, the laser pulse has an output power of 24W before compression and an output power of 11.45W after compression, and the single pulse energy can reach 57uJ, whereas the conventional chirped pulse amplification scheme is adopted, that is, the first multiple-range generating device 1 and the second multiple-range generating device 2 are removed, and the single pulse energy is only 30 uJ.
Example 2:
in this embodiment, the first double-range generating device uses a 2 × 2 coupler 4, and the rest is the same as that in embodiment 1, and the implementation manner is as shown in fig. 3, an incident beam (i) enters the broadening fiber 2 through the 2 × 2 coupler 4, a laser beam (ii) after first broadening passes through the polarization maintaining mirror 3, returns to the broadening fiber 2 on the original path, and is output through another port of the 2 × 2 coupler 4 as a laser beam (iv).
Example 3:
in this embodiment, the second double-range generating device 2 is a plane mirror, and the implementation manner of the second double-range generating device is as shown in fig. 5, an incident light beam strikes the plane mirror 9, is reflected into a Chirped Volume Bragg Grating (CVBG)10, and is reflected twice back and forth between the two beams and then is reflected and output on the interface of the plane mirror 9.
Example 4:
the second double-range generating device 2 of this embodiment is a quadruple-range generating device, and its implementation is shown in fig. 7, an incident beam is transmitted through a polarization beam splitter 23, a laser beam obtained through a quarter-wave plate 24 enters a Chirped Volume Bragg Grating (CVBG)25 to be compressed for the first time, the reflected light returns in the original path, a reflected beam is obtained through the polarization beam splitter 23, a parallel beam is formed in a right-angle prism 26, the reflected beam is reflected back to the Chirped Volume Bragg Grating (CVBG)25 through the polarization beam splitter 23, the reflected laser beam after the second compression is transmitted through the polarization beam splitter 23, an output laser beam forms a parallel beam ninthly in the right-angle prism 27, the parallel beam is transmitted into the Chirped Volume Bragg Grating (CVBG)25 through the polarization beam splitter 23, the reflected laser beam after the third compression is reflected through the polarization beam splitter 23, outputting a laser beam
Forming parallel beams in a right angle prism 26
The reflected laser beam is reflected back to a Chirped Volume Bragg Grating (CVBG)25 via a polarization beam splitter prism 23, and the reflected laser beam is compressed for the fourth time
Transmitting the output, i.e. the laser beam, through a polarizing beam splitter prism 23
The same reference numerals are used for the same components in the embodiments for better identification in the drawings, and do not represent different components.
Claims (1)
1. A high-efficiency chirped pulse amplification system is characterized in that a main structure comprises a seed source, a first double-range generating device, a dispersion broadening device, an amplifying device, a second double-range generating device and a dispersion compressing device, wherein the seed source is connected with the first double-range generating device, the first double-range generating device is respectively connected with the dispersion broadening device and the amplifying device, the amplifying device is connected with the second double-range generating device, the second double-range generating device is connected with the dispersion compressing device, and laser pulses output by the seed source pass through the first double-range generating device and then pass through the dispersion broadening device for multiple times to broaden the pulses; the broadened laser pulse returns to the first double-range generating device and enters the amplifying device for pulse amplification; after the amplified laser pulse passes through the second multiple-range generating device, the amplified laser pulse is subjected to pulse compression through a dispersion compression device for multiple times; the compressed laser pulse returns to the second double-stroke generating device for laser output; the seed source adopts a laser light source which can emit pulses with the central wavelength of 1030nm, the repetition frequency of 200kHz, the pulse width of 6ps and the power of 12.45 mW; the central wavelength of the filter is 1030nm, and the bandwidth is 6 nm; the dispersion broadening device adopts broadening optical fiber, the broadening optical fiber is an optical fiber PM980 with the length of 1.5km, and the dispersion coefficient is 25ps2(ii) km; the amplifying device adopts an amplifier with three-stage amplification; the dispersion compression device adopts a chirped volume Bragg grating, the center wavelength of the chirped volume Bragg grating is 1030nm, the bandwidth of the chirped volume Bragg grating is 8nm, and the dispersion amount of the chirped volume Bragg grating is-33.8 ps2The first double-range generating device and the second double-range generating device both adopt double-range generating devices, wherein the first double-range generating device adopts a circulator, the second double-range generating device adopts a combination of a polarization beam splitter prism, a quarter wave plate and a right-angle prism, and laser pulses generated by a seed source enter a first port of the circulator after passing through a filter; the broadening optical fiber is connected with a second port of the circulator, and laser passes through the broadening optical fiber twice through a polarization maintaining reflector; returning to the third port of the circulator and entering an amplifier; the polarization state of the output light of the amplifier is adjusted by using a half-wave plate, so that the output light enters a polarization beam splitter prism and a quarter-wave plate; in thatPerforming primary compression in the chirped volume Bragg grating, and returning the reflected light beam in the original path; the reflected light beams obtained by the polarization beam splitter 18 form parallel light beams in the right-angle prism, and then the parallel light beams are reflected back to the chirped body Bragg grating by the polarization beam splitter, and the transmitted light beams of the laser light beams reflected after the second compression pass through the polarization beam splitter are reflected and output by the reflector; the output power of the laser pulse before compression is 24W, the output power after compression is 11.45W, and the single pulse energy reaches 57 uJ.
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| CN110567379B (en) * | 2019-09-26 | 2021-03-30 | 合肥工业大学 | Spectrum confocal displacement sensor based on chirped fiber bragg grating |
| CN111799645B (en) * | 2020-05-27 | 2021-11-05 | 杭州奥创光子技术有限公司 | Chirp pulse compression synthesis system and application method thereof |
| CN114498275A (en) * | 2022-03-31 | 2022-05-13 | 武汉华锐超快光纤激光技术有限公司 | High-power femtosecond laser and power amplification method of high-power femtosecond laser |
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| CN2901639Y (en) * | 2006-03-23 | 2007-05-16 | 北京工业大学 | Laser pulse four-way amplifier |
| CN104901152A (en) * | 2015-06-10 | 2015-09-09 | 广东量泽激光技术有限公司 | Novel femtosecond optical fiber amplifier |
| CN205693131U (en) * | 2016-06-21 | 2016-11-16 | 北京工业大学 | 240fs all-fiber Chirp pulse amplification laser system |
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| US20090285245A1 (en) * | 2007-05-04 | 2009-11-19 | Jian Liu | Fiber-based ultrafast laser |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2901639Y (en) * | 2006-03-23 | 2007-05-16 | 北京工业大学 | Laser pulse four-way amplifier |
| CN104901152A (en) * | 2015-06-10 | 2015-09-09 | 广东量泽激光技术有限公司 | Novel femtosecond optical fiber amplifier |
| CN205693131U (en) * | 2016-06-21 | 2016-11-16 | 北京工业大学 | 240fs all-fiber Chirp pulse amplification laser system |
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