CN105720474B - Opposite direction compression Chirp pulse amplification laser system - Google Patents
Opposite direction compression Chirp pulse amplification laser system Download PDFInfo
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- CN105720474B CN105720474B CN201410738650.6A CN201410738650A CN105720474B CN 105720474 B CN105720474 B CN 105720474B CN 201410738650 A CN201410738650 A CN 201410738650A CN 105720474 B CN105720474 B CN 105720474B
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Abstract
A kind of opposite compression Chirp pulse amplification laser system, the system includes that seed source, stretcher, amplifier, opposite compressor and focus lamp, the opposite compressor are made of a gratings compressor, two polarization spectro pieces, two polarization converters, a delayer and five reflecting mirrors.The present invention can be achieved gratings compressor two-way timesharing secondary use, breach the limitation of gratings compressor bearing capacity, avoid nonlinear effect, dispersion decrement having the same, it can be achieved that Chirp pulse amplification laser system fan-out capability multiplication.
Description
Technical field
The present invention relates to laser field, in particular to a kind of Chirp pulse amplification laser system is primarily adapted for use in high energy
Measure the performance boost of high power ultrashort and ultrahigh laser system.
Background technique
Currently, high-energy high power ultrashort and ultrahigh laser is the emphasis and hot spot of laser technology research in the world.1985
The birth of chirped pulse amplification technique is so that the mankind can be obtained laser power and power density breaches GW (109W) and
1015W/cm2, and the technology makes laser power and power density hasty breaching TW (10 in subsequent 30 years12) and 10 W18W/
cm2, and PW (1015) and 10 W20W/cm2.The development of the laser technology is greatly promoted the research of basic physics, is the mankind
It explores that primitive material, universe is unknown and energy problem etc. creates unprecedented condition.Therefore, currently both at home and abroad grind and
The high-energy high power ultrashort and ultrahigh laser device built is numerous: the national igniter (NIF) in such as U.S., Omega EP device
With Texas Petawatt device, Japanese LFEX device, the ELI project of European Union, the APRI device of South Korea, in the Chinese Academy of Sciences
The number of extra large optical precision optical machinery research institute claps watt device and God Light claps watt device.By means of power in 30 years hairs of chirped pulse amplification technique
Exhibition, the above large scale laser instrument part has breached the high point single beam 2PW, but distance 100PW or even EW (1018W) target remains
In great gap.To find out its cause, core is the bottleneck problem of pulse shortener.As shown in Figure 1, chirped pulse amplification technique
Principle be: seed source (1 ') exports short pulse through stretcher (2 ') time domain broadening, recycle amplifier (3 ') carry out power or
Energy amplification, therefore damage and nonlinear effect are efficiently avoided, then time domain data compression is carried out using gratings compressor (4 ')
It restores short pulse and obtains high power, finally focused using focus lamp (5 ') and obtain high power density.(referring particularly to document
Donna Strickland,Gerard Mourou."compression of amplified chirped optical
Pulses " Optics Communications, 1985, volume 56, the 3rd phase, 219-221 pages).As it can be seen that the technology mentions power
The bottleneck risen has moved on to gratings compressor by amplifier, since gratings compressor will bear high laser power, holds very much
It is also easy to produce element destruction.This is also the core reasons that current above-mentioned large-scale plant is difficult improving laser performance.So far, above-mentioned
At the gratings compressor of laser aid, beam size reaches sub- rice magnitude, and element bore reaches a meter magnitude.For obtaining more Gao Gong
The laser of rate, ad infinitum increase beam size and element bore are obviously no longer real.
Summary of the invention
It is an object of the invention to overcome above-mentioned the shortcomings of the prior art, a kind of opposite compression chirped pulse is proposed
Amplification laser system.System of the invention realizes the two-way timesharing secondary use of gratings compressor, breaches gratings compressor
The limitation of bearing capacity avoids nonlinear effect, and dispersion decrement having the same is, it can be achieved that Chirp pulse amplification laser system
The multiplication for fan-out capability of uniting.
In order to achieve the above object of the invention, technical scheme is as follows:
A kind of opposite compression Chirp pulse amplification laser system, which includes seed source, stretcher, amplifier, compression
Device and focus lamp, it is characterized in that, the compressor is opposite compressor, which includes gratings compressor, the
One polarization spectro piece, the second polarization spectro piece, the first polarization converter, the second polarization converter, delayer, the first reflecting mirror,
Second reflecting mirror, third reflecting mirror, the 4th reflecting mirror and the 5th reflecting mirror are constituted；The positional relationship of above-mentioned component is as follows:
The short-pulse laser of the seed source output amplifies through stretcher broadening, amplifier, into the opposite direction pressure
After contracting device, the p-polarization light beam of transmission and the s light beam of reflection are divided by the first polarization spectro piece:
The p-polarization light beam becomes s polarised light through the first polarization converter, is reflected into grating pressure through the first reflecting mirror
The compression of contracting device is reflected into delayer delay through the second polarization spectro piece, the focus lamp is reflected into through the second reflecting mirror
And target spot is focused to, the delayer is matched with the first polarization converter realizes that spatial altitude returns；
The s light beam through third reflecting mirror, the 4th reflecting mirror is reflected into the second polarization converter becomes p-polarization
Light, then be transmitted into the gratings compressor through the second polarization spectro piece and compress, first is reflected into partially through the first reflecting mirror
Vibration converter becomes s polarised light, reflects through the first polarization spectro piece, is reflected into focus lamp through the 5th reflecting mirror and focuses to target
Point, the first polarization converter is matched with the second polarization converter realizes that spatial altitude returns；
The p-polarization light and the s polarised light respectively only primary transmission of experience before compression, only undergo upon compression
Reflection, delayer make two-beam while reaching focusing target spot.
Technical effect of the invention is as follows:
Compression Chirp pulse amplification laser system of the invention opposite, in opposite compressor, laser is based on polarization state by the
One polarization spectro piece is divided into p-polarization light beam and s light beam, and two-beam is opposite in opposite direction to pass through gratings compressor, in fact
The bi-directional secondary for having showed gratings compressor utilizes；
In opposite compressor, laser is based on polarization state and is divided into p-polarization light beam and s polarised light by the first polarization spectro piece
Beam, two-beam avoid raster burn caused by space-time is superimposed with every block of grating of different moments experience gratings compressor；
In opposite compressor, the p-polarization light beam and the respectively only primary transmission of experience before compression of s light beam,
Only experience reflection, avoids nonlinear effect after compression；
The p-polarization light beam and s light beam optical path having the same in gratings compressor, thus it is having the same
Dispersion decrement；
The two-way timesharing secondary use of gratings compressor, breaches the limitation of gratings compressor bearing capacity, realizes Zhou
The multiplication for pulse amplifying laser system fan-out capability of singing.
Based on the above-mentioned technical proposal, opposite compression Chirp pulse amplification laser system of the invention has compared with prior art
There is following technology a little:
The present invention realizes the two-way timesharing secondary use of gratings compressor, breaches the limit of gratings compressor bearing capacity
System, avoids nonlinear effect, and dispersion decrement having the same is, it can be achieved that Chirp pulse amplification laser system fan-out capability
Multiplication.
Detailed description of the invention
Fig. 1 is existing Chirp pulse amplification laser system schematic.
Fig. 2 is opposite compression Chirp pulse amplification laser system schematic of the invention.
Fig. 3 is polarization converter schematic diagram.
Fig. 4 is delayer schematic diagram.
Specific embodiment
We come in conjunction with attached drawing and specific embodiment to opposite compression Chirp pulse amplification laser system of the invention below
System is described in further detail, in the hope of providing a clearer understanding of structure composition situation and workflow of the invention, but
It cannot be used as a limitation the scope of protection of the patent of the present invention.
Fig. 2 is opposite compression Chirp pulse amplification laser system schematic of the invention, as seen from the figure, the opposite compression of the present invention
Chirp pulse amplification laser system includes seed source 1, stretcher 2, amplifier 3, opposite compressor 4 and focus lamp 5, pair
It include gratings compressor 9, the first polarization spectro piece 6, the second polarization spectro piece 10, the first polarization converter 7, the to compressor 4
Two polarization converters 15, delayer 11 and the first reflecting mirror 8, the second reflecting mirror 12, third reflecting mirror 13,14 and of the 4th reflecting mirror
5th reflecting mirror 16.Polarization converter as described in Figure 3 is made of two orthogonal reflecting mirrors of the plane of incidence, respectively instead
Mirror m1 and reflecting mirror m2 are penetrated, incident p-polarized light is s polarised light through polarization converter output, and transmission direction occurs 90 degree of rotations, passes
There is space drop in defeated height.Delayer as described in Figure 4 is made of three reflecting mirrors, respectively reflecting mirror M1, reflecting mirror
Space compensation of drop in elevation may be implemented in M2 and reflecting mirror M3, and incident light is parallel with emergent light and transmission direction is on the contrary, then along incident light
Delay adjustment may be implemented with outgoing optical transmission direction integral translation.
In above-mentioned opposite compression Chirp pulse amplification laser system, the short-pulse laser that seed source 1 exports is through stretcher 2
Broadening, amplifier 3 amplify, into opposite compressor 4 after divided by the first polarization spectro piece 6 for the p-polarization light beam of transmission and reflection
S light beam:
The p-polarization light beam becomes s polarised light through the first polarization converter 7, is reflected into grating through the first reflecting mirror 8
Compressor 9 compresses, and is reflected into delayer 11 through the second polarization spectro piece 10 and is delayed, is reflected into focusing through the second reflecting mirror 12
Mirror 5 simultaneously focuses to target spot, and the delayer 11 is matched with the first polarization converter 7 realizes that spatial altitude returns；
The s light beam is reflected into the second polarization converter 15 through third reflecting mirror 13, the 4th reflecting mirror 14 and becomes
For p-polarization light, gratings compressor 9 is transmitted into through the second polarization spectro piece 10 and is compressed, is reflected into first through the first reflecting mirror 8
Polarization converter 7 becomes s polarised light, reflects through the first polarization spectro piece 6, and the 5th reflecting mirror 16 is reflected into focus lamp 5 and gathers
For coke to target spot, the first polarization converter 7 is matched with the second polarization converter 15 realizes that spatial altitude returns；
The p-polarization light and the s polarised light respectively only primary transmission of experience before compression, only undergo upon compression
Reflection.
Laser pulse width is wide before compressing, power is low, and laser pulse width is narrow after compression, power is high, therefore efficiently avoids transmiting
Nonlinear effect in the process.
The delayer 11 is used to adjust two-beam and reaches the time difference for focusing target spot.The P-polarized light experience
The first polarization converter 7 is matched with delayer 11 in path realizes that light beam spatial altitude returns；The road of the s polarised light experience
The first polarization converter 7 is matched with the second polarization converter 15 in diameter realizes that light beam spatial altitude returns.
Experiment shows that compared with first technology, the present invention realizes the two-way timesharing secondary use of gratings compressor, breaks through
The limitation of gratings compressor bearing capacity, avoids nonlinear effect, dispersion decrement having the same is, it can be achieved that chirp arteries and veins
Rush the multiplication of amplification laser system fan-out capability.
Claims (1)
1. a kind of opposite compression Chirp pulse amplification laser system, which includes seed source (1), stretcher (2), amplifier
(3), compressor and focus lamp (5), which is characterized in that the compressor is opposite compressor (4), the opposite direction compressor (4)
Including gratings compressor (9), the first polarization spectro piece (6), the second polarization spectro piece (10), the first polarization converter (7), second
Polarization converter (15), delayer (11), the first reflecting mirror (8), the second reflecting mirror (12), third reflecting mirror (13), the 4th are instead
Penetrate mirror (14) and the 5th reflecting mirror (16)；
The short-pulse laser of seed source (1) output amplifies through stretcher (2) broadening, amplifier (3), into pair
To after compressor (4), the p-polarization light beam of transmission and the s light beam of reflection are divided by the first polarization spectro piece (6):
The p-polarization light beam becomes s polarised light through the first polarization converter (7), is reflected into grating through the first reflecting mirror (8)
Compressor (9) compression is reflected into delayer (11) delay through the second polarization spectro piece (10), reflects through the second reflecting mirror (12)
Into the focus lamp (5) and target spot is focused to, it is empty that the delayer (11) matches realization with the first polarization converter (7)
Between highly return；
The s light beam is reflected into the second polarization converter (15) through third reflecting mirror (13), the 4th reflecting mirror (14)
Become p-polarization light, then be transmitted into the gratings compressor (9) through the second polarization spectro piece (10) and compress, through the first reflection
Mirror (8), which is reflected into the first polarization converter (7), becomes s polarised light, reflects through the first polarization spectro piece (6), through the 5th reflection
Mirror (16) is reflected into focus lamp (5) and focuses to target spot, first polarization converter (7) and the second polarization converter
(15) matching realizes that spatial altitude returns.
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| CN201410738650.6A CN105720474B (en) | 2014-12-05 | 2014-12-05 | Opposite direction compression Chirp pulse amplification laser system |
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| CN108594461B (en) * | 2018-01-31 | 2020-06-09 | 中国科学院上海光学精密机械研究所 | Internal light distribution type grating compressor |
| CN108365505B (en) * | 2018-02-02 | 2019-06-18 | 武汉安扬激光技术有限责任公司 | A kind of lossless tandem type pulse stretcher of all -fiber |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201118090Y (en) * | 2007-08-29 | 2008-09-17 | 中国工程物理研究院上海激光等离子体研究所 | Chirp pulse amplification laser apparatus |
| CN103066484A (en) * | 2012-12-27 | 2013-04-24 | 中国科学院上海光学精密机械研究所 | CPA and OPCPA mixed type ultra high power femtosecond laser system |
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| KR100571176B1 (en) * | 2004-09-08 | 2006-04-13 | 한국과학기술원 | Apparatus for light amplification by amplitude dividing |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201118090Y (en) * | 2007-08-29 | 2008-09-17 | 中国工程物理研究院上海激光等离子体研究所 | Chirp pulse amplification laser apparatus |
| CN103066484A (en) * | 2012-12-27 | 2013-04-24 | 中国科学院上海光学精密机械研究所 | CPA and OPCPA mixed type ultra high power femtosecond laser system |
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