CN104577690A - Ultra-broadband coherent synthesis chirp pulse amplification laser system - Google Patents

Ultra-broadband coherent synthesis chirp pulse amplification laser system Download PDF

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CN104577690A
CN104577690A CN201510031289.8A CN201510031289A CN104577690A CN 104577690 A CN104577690 A CN 104577690A CN 201510031289 A CN201510031289 A CN 201510031289A CN 104577690 A CN104577690 A CN 104577690A
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diffraction
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diffraction rib
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light beam
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CN104577690B (en
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李朝阳
冷雨欣
李儒新
王乘
李帅
郭晓杨
李妍妍
王丁
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Shanghai Institute of Optics and Fine Mechanics of CAS
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Shanghai Institute of Optics and Fine Mechanics of CAS
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Abstract

The invention provides an ultra-broadband coherent synthesis chirp pulse amplification laser system. The system comprises an ultra-broadband seed source, a pulse broadening compression and spectral beam splitting and beam combination unit, an optical parameter amplification unit, a reflector and a mirror lens. The pulse broadening compression and spectral beam splitting and beam combination unit comprises a high-dispersion transmission panel and eight diffraction grisms. The optical parameter amplification unit comprises three optical parameter amplifiers of different gain bandwidth. By means of the ultra-broadband coherent synthesis chirp pulse amplification laser system, high gain amplification can be conducted on ultra-broadband laser pulses, the gain-narrowing effect, the nonlinear effect and gain medium damage are avoided, and joule-level monocyclic laser pulses can be generated.

Description

Ultra broadband optics coherence tomography Chirp pulse amplification laser system
Technical field
The present invention relates to laser field, particularly a kind of ultra broadband optics coherence tomography Chirp pulse amplification laser system, it is mainly applicable to ultra broadband laser system, optics coherence tomography laser system, monocycle laser system, joule level high energy monocycle laser system.
Background technology
High-energy monocycle (~ 3fs) laser pulse is one of forefront of current international laser technical research.Gunther Krauss in 2009 etc. by two-way homology but the femtosecond fiber Laser coherent combining of different-waveband create and receive a joule 4.3fs monocycle laser pulse (Gunther Krauss, et.al.Synthesis of a single cycle of light withcompact erbium-doped fibre technology, Nature photonics, Vol 4, pp33,2010.).Shu-Wei Huang in 2011 etc. are by two-way homology but the optically erasing Laser coherent combining of different-waveband creates 15uJ monocycle inner laser pulse (Shu-Wei Huang, et.al.High-energy pulse synthesis with sub-cyclewaveform control for strong-field physics, Nature photonics, Vol 5, pp 475,2011.).Although above-mentioned two kinds of methods all achieve monocycle laser pulse, single pulse energy is very little, and main cause comprises:
1. above-mentioned two kinds of methods are all carry out optics coherence tomography to conversion limit short pulse, therefore the nonlinear effect of high power pulse and dielectric damages threshold restriction composite pulse energy lift in transmission medium;
2. above-mentioned two kinds of methods are all the optics coherence tomography utilizing double color plate to realize two pulses, and therefore the nonlinear effect of high power transmitted light and double color plate damage threshold limit composite pulse energy lift.
Bruno E.Schmidt in 2013 etc. avoid Gain-narrowing effect at the Fourier plane enterprising line frequency territory subrane optically erasing of the 4f system based on grating, simultaneously because Fourier transform limited pulses broadening improves the single pulse energy of amplification, create 1.43mJ binary cycle laser pulse (Bruno E.Schmidt, et.al.Frequencydomain optical parametric amplification, Nature communications, ncomms4643,2014.).Although the energy lift of cycle level laser pulse to millijoule level, is difficult to again be promoted to joule, several joules, even tens of joules of levels by the method.Main cause is that the method is amplified different frequency band pulse in Fourier plane, and the limited bandwidth of every band frequency wave band avoids the gain narrowing of amplification medium, and the time pulsewidth of broadening reduces nonlinear effect, improves damage threshold simultaneously.If but the bandwidth reducing every band frequency wave band further needs very highdensity grating, and the concave mirror of very heavy caliber and unusual long-focus, and therefore system scale general is very huge and become infeasible.
Summary of the invention
The object of the invention is to the deficiency overcoming the existence of above-mentioned prior art, propose a kind of ultra broadband optics coherence tomography Chirp pulse amplification laser system.This system can carry out plus and blowup to ultra broadband laser pulse, avoids the damage of Gain-narrowing effect, nonlinear effect and gain media, can produce joule level monocycle laser pulse.
In order to reach foregoing invention object, technical scheme of the present invention is as follows:
A kind of ultra broadband optics coherence tomography Chirp pulse amplification laser system, its feature is, this system comprises ultra broadband seed source, Shu Danyuan is closed in pulse strenching compression and spectrum beam splitting, optically erasing unit, catoptron and catadioptric mirror, described pulse strenching compression and spectrum beam splitting are closed Shu Danyuan and are comprised one piece high dispersion transmission flat board and eight pieces of diffraction rib grid: the first diffraction rib grid, second diffraction rib grid, 3rd diffraction rib grid, 4th diffraction rib grid, 5th diffraction rib grid, 6th diffraction rib grid, 7th diffraction rib grid and the 8th diffraction rib grid, described optically erasing unit comprises the photoparametric amplifier of three different gains bandwidth: the first photoparametric amplifier, second photoparametric amplifier and the 3rd photoparametric amplifier, the position relationship of above-mentioned component is as follows:
The flashlight that described ultra broadband seed source exports enters pulse strenching compression and Shu Danyuan is closed in spectrum beam splitting: after the first diffraction rib grid and the second diffraction rib grid diffraction, light beam to scatter in space generation space chirp based on spectrum, is divided into high frequency band light beam, mf band light beam and low-frequency band light beam through after high dispersion transmission flat board:
Described high frequency band light beam eliminates space chirp through the 3rd diffraction rib grid and the 4th diffraction rib grid diffraction, the first photoparametric amplifier is entered through the first catoptron reflection, ideler frequency light after amplification is turned back through the first catadioptric mirror and changes height and position, through the second catoptron reflection again through the 4th diffraction rib grid and the 3rd diffraction rib grid diffraction, through the dull and stereotyped transmission of high dispersion transmission, export through the second diffraction rib grid and the first diffraction rib grid diffraction;
Described mf band light beam eliminates space chirp through the 5th diffraction rib grid and the 6th diffraction rib grid diffraction, the second photoparametric amplifier is entered through the 3rd catoptron reflection, ideler frequency light after amplification is turned back through the second catadioptric mirror and changes height and position, through the 4th catoptron reflection through the 6th diffraction rib grid and the 5th diffraction rib grid diffraction, through the dull and stereotyped transmission of high dispersion transmission, export through the second diffraction rib grid and the first diffraction rib grid diffraction;
Described low-frequency band light beam eliminates space chirp through the 7th diffraction rib grid and the 8th diffraction rib grid diffraction, the 3rd photoparametric amplifier is entered through the 5th catoptron reflection, ideler frequency light after amplification is turned back through the 3rd catadioptric mirror and changes height and position, through the 6th catoptron reflection, through the 8th diffraction rib grid and the 7th diffraction rib grid diffraction, through the dull and stereotyped transmission of high dispersion transmission, export through the second diffraction rib grid and the first diffraction rib grid diffraction.
It is parallel with the second diffraction rib grid that the first diffraction rib grid in Shu Danyuan are closed in described pulse strenching compression and spectrum beam splitting, 3rd diffraction rib grid, the 4th diffraction rib grid, the 5th diffraction rib grid, the 6th diffraction rib grid, the 7th diffraction rib grid and the 8th diffraction rib grid are parallel to each other, and the first diffraction rib grid, the second diffraction rib grid and the 3rd diffraction rib grid, the 4th diffraction rib grid, the 5th diffraction rib grid, the 6th diffraction rib grid, the 7th diffraction rib grid and the 8th diffraction rib grid are about the dull and stereotyped mirror image antiparallel of high dispersion transmission.
Described pulse strenching compression and spectrum beam splitting close 2nd order chromatic dispersion that Shu Danyuan introduces for negative, third-order dispersion be zero.
First photoparametric amplifier in described optically erasing unit, the second photoparametric amplifier are different with the gain bandwidth (GB) of the 3rd photoparametric amplifier, amplify respectively to high frequency band light beam, mf band light beam and low-frequency band light beam.
Described first mirror, second mirror and the 3rd mirror of turning back of turning back of turning back all has along turning back the translational controlling mechanism of optical path direction, realizes the delay adjustment of optics coherence tomography.
Shu Danyuan is closed in described pulse strenching compression and spectrum beam splitting, flashlight before optically erasing unit is realized based on the time explanation of warbling and the space beam splitting based on spectrum, the ideler frequency light after optically erasing unit is realized closing bundle based on the time compress of warbling and based on the space of spectrum.
Technique effect of the present invention is as follows:
Ultra broadband optics coherence tomography Chirp pulse amplification laser system of the present invention, close in Shu Danyuan in first passage pulse strenching compression and spectrum beam splitting, flashlight scatters in space based on spectrum after the first diffraction rib grid and the second diffraction rib grid, through after high dispersion transmission flat board by the 3rd diffraction rib grid and the 4th diffraction rib grid, 5th diffraction rib grid and the 6th diffraction rib grid, and the 7th diffraction rib grid and the 8th diffraction rib grid be divided into high frequency band light beam, mf band light beam, and low-frequency band light beam, the space beam splitting based on spectrum is achieved while full remuneration space chirp.In addition, in this process, flashlight is introduced into second order and bears the time and warble and achieve the time explanation of pulse.
In optically erasing unit, high frequency band light beam, mf band light beam and low-frequency band light beam are amplified by the first photoparametric amplifier, the second photoparametric amplifier and the 3rd photoparametric amplifier subrane respectively, thus avoid Gain-narrowing effect.Due to amplification is time explanation pulse, thus avoids nonlinear effect and gain media damage.Optically erasing unit exports the ideler frequency light amplified to be had the time contrary with flashlight and warbles, the reversion thus the time that achieves warbles, and namely ideler frequency light has the positive time and warbles.
Again to be compressed by pulse strenching and spectrum beam splitting is closed in Shu Danyuan, high frequency band light beam ideler frequency light, mf band light beam ideler frequency light and low-frequency band light beam ideler frequency light are respectively by after the 4th diffraction rib grid and the 3rd diffraction rib grid, the 6th diffraction rib grid and the 5th diffraction rib grid and the 8th diffraction rib grid and the 7th diffraction rib grid diffraction, through after high dispersion transmission flat board through the second diffraction rib grid and the first diffraction rib grid diffraction, achieve while full remuneration space chirp based on spectrum space close bundle.In addition, in this process, ideler frequency light is introduced into second order and bears the time and warble and achieve the time compress of pulse.
Ultra broadband optics coherence tomography Chirp pulse amplification laser system of the present invention compared with prior art has following technical characterstic:
The present invention can carry out plus and blowup to ultra broadband laser pulse, avoids the damage of Gain-narrowing effect, nonlinear effect and gain media, can produce joule level monocycle laser pulse.
Accompanying drawing explanation
Fig. 1 is ultra broadband optics coherence tomography Chirp pulse amplification laser system embodiment schematic diagram of the present invention.
Embodiment
Come below in conjunction with drawings and Examples that the present invention is further elaborated, understand structure of the present invention composition situation and workflow in the hope of more cheer and bright, but the protection domain of patent of the present invention can not be limited with this.
Fig. 1 is ultra broadband optics coherence tomography Chirp pulse amplification laser system embodiment schematic diagram of the present invention, as seen from the figure, the present invention includes ultra broadband seed source 1, Shu Danyuan is closed in pulse strenching compression and spectrum beam splitting, optically erasing unit, catoptron and catadioptric mirror, described pulse strenching compression and spectrum beam splitting are closed Shu Danyuan and are comprised one piece high dispersion transmission dull and stereotyped 4 and eight pieces of diffraction rib grid: the first diffraction rib grid 2, second diffraction rib grid 3, 3rd diffraction rib grid 5, 4th diffraction rib grid 6, 5th diffraction rib grid 11, 6th diffraction rib grid 12, 7th diffraction rib grid 17 and the 8th diffraction rib grid 18, described optically erasing unit comprises the photoparametric amplifier of three different gains bandwidth: the first photoparametric amplifier 8, second photoparametric amplifier 14 and the 3rd photoparametric amplifier 20, the position relationship of above-mentioned component is as follows:
Ultra broadband seed source 1 exports 600nm-1200nm ultra-broadband signal light and enters pulse strenching compression and spectrum beam splitting and close Shu Danyuan: after the first diffraction rib grid 2 and the second diffraction rib grid 3 diffraction, light beam to scatter in space generation space chirp based on spectrum, is divided into 600nm-800nm high frequency band light beam, 800nm-1000nm mf band light beam and 1000nm-1200nm low-frequency band light beam through after high dispersion transmission flat board 4:
600-800nm high frequency band light beam eliminates space chirp through the 3rd diffraction rib grid 5 and the 4th diffraction rib grid 6 diffraction, the first photoparametric amplifier 8 is entered through the first catoptron 7 reflection, ideler frequency light after amplification is turned back through the first catadioptric mirror 9 and changes height and position, reflects again enter pulse strenching compression and spectrum beam splitting conjunction Shu Danyuan through the second catoptron 10: through the 4th diffraction rib grid 6 diffraction, through the 3rd diffraction rib grid 5 diffraction, through dull and stereotyped 4 transmissions of high dispersion transmission, through the second diffraction rib grid 3 diffraction, export through the first diffraction rib grid 2 diffraction.
800nm-1000nm mf band light beam eliminates space chirp through the 5th diffraction rib grid 11 and the 6th diffraction rib grid 12 diffraction, the second photoparametric amplifier 14 is entered through the 3rd catoptron 13 reflection, ideler frequency light after amplification is turned back through the second catadioptric mirror 15 and changes height and position, reflects again enter pulse strenching compression and spectrum beam splitting conjunction Shu Danyuan through the 4th catoptron 16: through the 6th diffraction rib grid 12 diffraction, through the 5th diffraction rib grid 11 diffraction, through dull and stereotyped 4 transmissions of high dispersion transmission, through the second diffraction rib grid 3 diffraction, export through the first diffraction rib grid 2 diffraction.
1000nm-1200nm low-frequency band light beam eliminates space chirp through the 7th diffraction rib grid 17 and the 8th diffraction rib grid 18 diffraction, the 3rd photoparametric amplifier 20 is entered through the 5th catoptron 19 reflection, ideler frequency light after amplification is turned back through the 3rd catadioptric mirror 21 and changes height and position, reflects again enter pulse strenching compression and spectrum beam splitting conjunction Shu Danyuan through the 6th catoptron 22: through the 8th diffraction rib grid 18 diffraction, through the 7th diffraction rib grid 17 diffraction, through dull and stereotyped 4 transmissions of high dispersion transmission, through the second diffraction rib grid 3 diffraction, export through the first diffraction rib grid 2 diffraction.
It is parallel with the second diffraction rib grid 3 that the first diffraction rib grid 2 in Shu Danyuan are closed in described pulse strenching compression and spectrum beam splitting, 3rd diffraction rib grid the 5, the 4th diffraction rib grid the 6, the 5th diffraction rib grid the 11, the 6th diffraction rib grid the 12, the 7th diffraction rib grid 17 and the 8th diffraction rib grid 18 are parallel to each other, first and second diffraction rib grid and third and fourth, five, six, seven, eight diffraction rib grid are about the dull and stereotyped 4 mirror image antiparallels of high dispersion transmission.Described pulse strenching compression and spectrum beam splitting close 2nd order chromatic dispersion that Shu Danyuan introduces for negative, third-order dispersion be zero.
In described optically erasing unit, the first photoparametric amplifier 8, second photoparametric amplifier 14 is different with the gain bandwidth (GB) of the 3rd photoparametric amplifier 20, and corresponding 600-800nm high frequency band light beam, 800nm-1000nm mf band light beam and 1000nm-1200nm low-frequency band light beam complete energy amplification respectively.
Described first mirror 9, second mirror 15 and the 3rd mirror 21 of turning back of turning back of turning back is turned back to the ideler frequency light that the first photoparametric amplifier 8, second photoparametric amplifier 14 and the 3rd photoparametric amplifier 20 amplify and changes height and position respectively.Described first mirror 9, second mirror 15 and the 3rd mirror 21 of turning back of turning back of turning back all has along turning back the translational adjustment of optical path direction, realizes the delay adjustment of optics coherence tomography.
Shu Danyuan is closed in described pulse strenching compression and spectrum beam splitting, flashlight before optically erasing unit is realized based on the time explanation of warbling and the space beam splitting based on spectrum, the ideler frequency light after optically erasing unit is realized closing bundle based on the time compress of warbling and based on the space of spectrum.
Close in Shu Danyuan in first passage pulse strenching compression and spectrum beam splitting, flashlight scatters in space based on spectrum after the first diffraction rib grid 2 and the second diffraction rib grid 3, through after high dispersion transmission flat board 4 by the 3rd diffraction rib grid 5 and the 4th diffraction rib grid 6, 5th diffraction rib grid 11 and the 6th diffraction rib grid 12, and the 7th diffraction rib grid 17 and the 8th diffraction rib grid 18 be divided into 600-800nm high frequency band light beam, 800nm-1000nm mf band light beam, and 1000nm-1200nm low-frequency band light beam, the space beam splitting based on spectrum is achieved while full remuneration space chirp.In addition, in this process, flashlight is introduced into second order and bears the time and warble and achieve the time explanation of pulse.
In optically erasing unit, 600-800nm high frequency band light beam, 800nm-1000nm mf band light beam and 1000nm-1200nm low-frequency band light beam are amplified by the first photoparametric amplifier 8, second photoparametric amplifier 14 and the 3rd photoparametric amplifier 20 subrane respectively, thus avoid Gain-narrowing effect.Due to amplification is time explanation pulse, thus avoids nonlinear effect and gain media damage.Optically erasing unit exports the ideler frequency light amplified to be had the time contrary with flashlight and warbles, the reversion thus the time that achieves warbles, and namely ideler frequency light has the positive time and warbles.
Again to be compressed by pulse strenching and spectrum beam splitting is closed in Shu Danyuan, 600-800nm high frequency band light beam ideler frequency light, 800nm-1000nm mf band light beam ideler frequency light, and 800nm-1000nm low-frequency band light beam ideler frequency light is respectively by the 4th diffraction rib grid 6 and the 3rd diffraction rib grid 5, 6th diffraction rib grid 12 and the 5th diffraction rib grid 11, and the 8th after diffraction rib grid 18 and the 7th diffraction rib grid 17 diffraction, through after high dispersion transmission flat board 4 through the second diffraction rib grid 3 and the first diffraction rib grid 2 diffraction, bundle is closed in the space achieved while full remuneration space chirp based on spectrum.In addition, in this process, ideler frequency light is introduced into second order and bears the time and warble and achieve the time compress of pulse.
Experiment shows, with compared with first technology, the present invention can carry out plus and blowup to 600nm-1200nm ultra broadband laser pulse, avoids the damage of Gain-narrowing effect, nonlinear effect and gain media, can produce joule level monocycle laser pulse.
It should be noted last that, in the present invention, ultra broadband laser is divided into three beams i.e. three frequency bands based on spectrum and carries out broadening, beam splitting, amplification, conjunction bundle, compression, according to the inventive method ultra broadband laser based on spectrum can be divided into arbitrarily bundle namely arbitrarily a frequency band carry out broadening, beam splitting, amplification, conjunction bundle, compression.Those of ordinary skill in the art should be appreciated that and modifies or equivalent replacement to technical scheme of the present invention, and do not depart from the spirit and scope of the present invention, it all should be encompassed in the middle of right of the present invention.

Claims (4)

1. a ultra broadband optics coherence tomography Chirp pulse amplification laser system, it is characterized in that, this system comprises ultra broadband seed source (1), Shu Danyuan is closed in pulse strenching compression and spectrum beam splitting, optically erasing unit, catoptron and catadioptric mirror, described pulse strenching compression and spectrum beam splitting are closed Shu Danyuan and are comprised one piece high dispersion transmission flat board (4), first diffraction rib grid (2), second diffraction rib grid (3), 3rd diffraction rib grid (5), 4th diffraction rib grid (6), 5th diffraction rib grid (11), 6th diffraction rib grid (12), 7th diffraction rib grid (17) and the 8th diffraction rib grid (18), described optically erasing unit comprises first photoparametric amplifier (8) with different gains bandwidth, second photoparametric amplifier (14) and the 3rd photoparametric amplifier (20), the position relationship of above-mentioned component is as follows:
The flashlight that described ultra broadband seed source (1) exports enters pulse strenching compression and Shu Danyuan is closed in spectrum beam splitting: scatter in space generation space chirp after the first diffraction rib grid (2) and the second diffraction rib grid (3) diffraction, is divided into high frequency band light beam, mf band light beam and low-frequency band light beam through after described high dispersion transmission flat board (4):
Described high frequency band light beam eliminates space chirp through the 3rd diffraction rib grid (5) and the 4th diffraction rib grid (6) diffraction, the first photoparametric amplifier (8) is entered through the first catoptron (7) reflection, ideler frequency light after amplification is turned back through the first catadioptric mirror (9) and changes height and position, through the second catoptron (10) reflection through the 4th diffraction rib grid (6) diffraction, through the 3rd diffraction rib grid (5) diffraction, through the transmission of high dispersion transmission flat board (4), through the second diffraction rib grid (3) diffraction, export through the first diffraction rib grid (2) diffraction;
Described mf band light beam eliminates space chirp through the 5th diffraction rib grid (11) and the 6th diffraction rib grid (12) diffraction, the second photoparametric amplifier (14) is entered through the 3rd catoptron (13) reflection, ideler frequency light after amplification is turned back through the second catadioptric mirror (15) and changes height and position, through the 4th catoptron (16) reflection, through the 6th diffraction rib grid (12) and the 5th diffraction rib grid (11) diffraction, through the transmission of high dispersion transmission flat board (4), export through the second diffraction rib grid (3) with through the first diffraction rib grid (2) diffraction;
Described low-frequency band light beam eliminates space chirp through the 7th diffraction rib grid (17) and the 8th diffraction rib grid (18) diffraction, the 3rd photoparametric amplifier (20) is entered through the 5th catoptron (19) reflection, ideler frequency light after amplification is turned back through the 3rd catadioptric mirror (21) and changes height and position, through the 6th catoptron (22) reflection, through the 8th diffraction rib grid (18) and the 7th diffraction rib grid (17) diffraction, through the transmission of high dispersion transmission flat board (4), export through the second diffraction rib grid (3) and the first diffraction rib grid (2) diffraction.
2. ultra broadband optics coherence tomography Chirp pulse amplification laser system according to claim 1, it is characterized in that, the first described diffraction rib grid (2) are parallel with the second diffraction rib grid (3), 3rd diffraction rib grid (5), 4th diffraction rib grid (6), 5th diffraction rib grid (11), 6th diffraction rib grid (12), 7th diffraction rib grid (17) and the 8th diffraction rib grid (18) are parallel to each other, first diffraction rib grid, second diffraction rib grid and the 3rd diffraction rib grid, 4th diffraction rib grid, 5th diffraction rib grid, 6th diffraction rib grid, 7th diffraction rib grid, 8th diffraction rib grid are about high dispersion transmission flat board (4) mirror image antiparallel, the 2nd order chromatic dispersion that Shu Danyuan introducing is closed in described pulse strenching compression and spectrum beam splitting is negative, third-order dispersion is zero.
3. ultra broadband optics coherence tomography Chirp pulse amplification laser system according to claim 1, it is characterized in that, described the first photoparametric amplifier (8), the second photoparametric amplifier (14) are different with the gain bandwidth (GB) of the 3rd photoparametric amplifier (20), amplify respectively to high frequency band light beam, mf band light beam and low-frequency band light beam.
4. ultra broadband optics coherence tomography Chirp pulse amplification laser system according to claim 1, it is characterized in that, described first mirror (9), second mirror (15) and the 3rd mirror (21) of turning back of turning back of turning back all has along turning back the translational controlling mechanism of optical path direction, realizes the delay adjustment of optics coherence tomography.
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CN113612536A (en) * 2021-08-04 2021-11-05 乔文超 Laser dispersion compensation structure based on grating

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