CN103928837B - Multi-pass amplifying system for high-power laser separation chirp pulses - Google Patents
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Abstract
A multi-pass amplifying system for high-power laser separation chirp pulses is composed of a laser seed pulse source, a pulse stretcher, a DPA regeneration cavity, bi-pass DPA modules and a pulse compressor. Seed pulses are output by the laser seed pulse source and first stretched into the chirp pulses through the pulse stretcher, then the power of the chirp pulses is amplified through the DPA regeneration cavity and the bi-pass DPA modules, and finally the amplified chirp pulses are compressed through the pulse compressor. The multiple levels of DPA modules are connected in series in a CPA module, and the DPA modules have the function of multi-pass pulse amplifying, so that the pulse power amplifying capacity of the multi-pass amplifying system is improved, and the influence of the nonlinear effect is effectively restrained.
Description
Technical field
The present invention relates to high-power laser pulse amplifying technique, the many journeys of particularly a kind of high power laser light separation chirped pulse
Amplification system.
Background technology
Nineteen sixty, the maiman of U.S.'s hughes laboratory has invented pulsed ruby laser.In Millisecond light pulse
Pumping under, ruby laser export musec order spike sequence, its peak power be kw magnitude.Subsequently, adjust q technology and
Mode-locking technique develops rapidly, and laser pulse peaks power is up to gw(109W) magnitude.When continuing to improve laser power, light beam is certainly
The aggravation of the nonlinear effects such as focusing, leads to optical medium to damage eventually.1985, rochester university of the U.S.
D.strickland and g.mourou application chirped pulse amplification (cpa) technology solves an above-mentioned difficult problem well.Seed pulse
First broadened for chirped pulse, be compressed to ultrashort pulse after power amplification again.Laser pulse peak can be made using cpa technology
Value power reaches tw(1012Or even pw(10 w)15W) magnitude.The restriction that medium bears threshold value, pole have been broken in the application of cpa technology
The big development having promoted ultra-short intense laser technology.But for laser of narrowband pulse, due to being difficult to its pulse stretcher to foot
Enough width, so traditional cpa technology is less applicable.In the last few years, discrete pulse amplify (dpa) technology develop into arrowband
Laser pulse scale-up problem provides preferable solution.
2007, shian zhou, frank w.wise and dimitre g.ouzounov proposed discrete pulse and amplify
(hereinafter referred to as dpa) technology, achieves the separation of pulse and compound (optics using Yttrium Orthovanadate (yvo4) crystal array
Letters, 2007,32 (7): 871-873).The ultimate principle of dpa is first seed pulse to be separated into two or even multiple arteries and veins
Punching, this pulse train is amplified to be integrated into a pulse again.Understand with the contrast of cpa technology, light can be broken through using dpa technology
The restriction to pulse stretching for the bands of a spectrum width, thus compensate for the deficiency of traditional cpa technology well.2012, s.roither and
A.j.verhoef et al. using sagnac annular light path equally achieve the separation of pulse with compound, can be more using the method
Easily and effectively pulse separation distance is extended and control (optics express, 2012,20 (22): 25121-
25129).In the same year, l.j.kong and f.w.wise et al. obtains peak power using the method for nonlinear crystal array dpa and is
The picosecond magnitude pulse (optics letters, 2012,37 (2): 253-255) of megawatt magnitude, l.daniault et al. utilizes
Birefringent crystal array and sagnac annular light channel structure have carried out to winged second-time pulse separating, have amplified and compound (optics
Express, 2012,20 (19): 21627-21634).2013, yoann zaouter and florent guichard et al. will
Cpa technology and dpa technology are combined into cpa-dpa technology (optics letters, 2013,38 (2): 106-108), and deeply visit
Beg for the compound problem (optics letters, 2013,38 (21): 4437-4440) with aspects such as compressions amplifying pulse.With
Year, marco kienel and arno klenke et al. also reports research raising pulse being combined with aspects such as compression efficiencies
(optics express, 2013,21 (23): 29031-29042；optics letters,2013,38(22):4593-
4596).But mostly only comprise single-stage dpa among said system, still to realize based on one way or round trip pulse amplifying.With
Cpa system is had to compare, the power amplification ability of existing dpa related system still is apparent not enough.In order to accelerate dpa technology practical enter
Journey, needs the pulse amplifying efficiency improving dpa and cpa-dpa system badly.
Content of the invention
The present invention provides a kind of high power laser light separation chirped pulse amplification system, and this system substantially increases cpa-dpa
The Pulse Power Magnification ability of system, this will promote popularization in high power laser light technical field for the cpa-dpa and dpa technology
Application.
The technical solution of the present invention is as follows:
A kind of high power laser light separation chirped pulse multi-pass amplifier, feature is that its composition includes laser seed pulse
Source, pulse stretcher, dpa regeneration chamber, bilateral dpa module and pulse shortener.Laser seed pulse source exports seed pulse, first
First is chirped pulse through pulse stretcher broadening, then regenerates chamber by dpa and bilateral dpa module carries out power amplification to it,
Finally using pulse shortener, the chirped pulse after amplifying is compressed.
Described pulse stretcher and pulse shortener refer to the technical scheme (optik＆ in traditional cpa system
Photonik, 2010,5 (4): 30-33).
Described dpa regenerates the composition in chamber: is sequentially placed the first film polarizer, the first bubble on incident p polarization direction
Ke Ersi box, λ/4 wave plate, the one 0 ° of reflecting mirror, fast (slow) direction of principal axis of described λ/4 wave plate and the polarization of p polarisation
Angle between direction is 45 °, returns s polarisation and reflects at the first film polarizer, on s polarisation reflection direction successively
Place the first pulse separation/recombiner, first laser gain media, the 2nd λ/4 wave plate, the 2nd 0 ° of reflecting mirror, described 2nd λ/4
Angle between fast (slow) direction of principal axis of wave plate and the polarization direction of p polarisation is 45 °.Its work process can be described as, p polarisation arteries and veins
It was punched through the first film polarizer and entered intracavity, sequentially passed through the first Pockels' cell, λ/4 wave plate being not powered on pressing, institute
Stating the angle between fast (slow) direction of principal axis of λ/4 wave plate and the polarization direction of p polarisation is 45 °, and then p polarisation pulse is changed into
Rotatory polarization pulse, rotatory polarization pulse reflect through the one 0 ° of reflecting mirror after again by λ/4 wave plate, be not powered on press first bubble
Kerr cell, rotatory polarization pulse is changed into s polarisation pulse, and the polarization direction of s polarisation pulse is perpendicular to the polarization direction of p polarisation, s polarisation
Pulse is reflected at the first film polarizer, then produces by s polarisation pulse and p polarisation arteries and veins through the first pulse separation/recombiner
Rush formed line polarisation pulse train, the 2nd λ/4 wave plate, institute are amplified and passed through to pulse train at first laser gain media
Stating the angle between fast (slow) direction of principal axis of the 2nd λ/4 wave plate and the polarization direction of p polarisation is 45 °, then line polarisation pulse sequence
Row are changed into rotatory polarization pulse train, rotatory polarization pulse train reflect through the 2nd 0 ° of reflecting mirror after again by the 2nd λ/4 wave plate, justify
Polarisation pulse train becomes the line polarisation pulse train by being made up of s polarisation pulse and p polarisation pulse again, and pulse train is through again
Amplify at first laser gain media and s polarisation pulse is synthesized by pulse separation/recombiner, s polarisation pulse is through
One film polarizer reflection, then sequentially pass through the first Pockels' cell, λ/4 wave plate adding λ/4 voltage, s polarisation pulse becomes
For p polarisation pulse, p polarisation pulse reflect through the one 0 ° of reflecting mirror after again by λ/4 wave plate, plus λ/4 voltage first
Pockels' cell, p polarisation pulse is changed into s polarisation pulse again, and then s polarisation pulse is just locked in intracavity and continues to amplify, when removing
Except regenerative amplification pulse just can be exported at the first film polarizer after added λ/4 voltage on the first Pockels' cell.
The composition of described bilateral dpa module includes: be sequentially placed on incident p polarization direction the second film polarizer,
One 45 ° of Faraday polarization apparatus, λ/2 wave plate, the 3rd film polarizer, the second pulse separation/recombiner, second laser increase
Beneficial medium, the 2nd 45 ° of Faraday polarization apparatus, the 3rd 0 ° of reflecting mirror, fast (slow) direction of principal axis adjusting described λ/2 wave plate makes
Emergent light is still that p is inclined, returns s polarisation and reflects at the 3rd film polarizer, places the 4th 0 ° on s polarisation reflection direction
Reflecting mirror.Its work process can be described as, and after p polarisation pulse passes through the second film polarizer, then revolves through the one 45 ° of faraday
Light device, λ/2 wave plate, fast (slow) direction of principal axis adjusting described λ/2 wave plate makes pulse still for p partially, and the inclined pulse of p continues
Through the 3rd film polarizer, then produce through the second pulse separation/recombiner and be made up of s polarisation pulse and p polarisation pulse
Line polarisation pulse train, pulse train existed by the 2nd 45 ° of Faraday polarization apparatus after amplifying at second laser gain media
Reflect at 3rd 0 ° of reflecting mirror, s polarisation pulse and p polarisation pulse pass twice through the 2nd 45 ° of Faraday polarization apparatus rear polarizer direction
All turn over 90 °, pulse train synthesizes s polarisation pulse through amplifying again and by the second pulse separation/recombiner, s polarisation
After pulse is reflected through the 3rd film polarizer, the 4th 0 ° of reflecting mirror, the 3rd film polarizer successively, divide through the second pulse again
The line polarisation pulse train being made up of s polarisation pulse and p polarisation pulse from the generation of/recombiner, pulse train is in second laser
Pass through the 2nd 45 ° of Faraday polarization apparatus, again by the 2nd 45 ° after reflecting at the 3rd 0 ° of reflecting mirror after amplifying at gain media
Faraday polarization apparatus, close after pulse train is amplified at second laser gain media and by the second pulse separation/recombiner
Become p polarisation pulse, after p polarisation pulse passes through the 3rd film polarizer, continue through λ/2 wave plate, the one 45 ° of faraday
Polarization apparatuss and be changed into s polarisation pulse, s polarisation pulse is reflected at the second film polarizer, so just can achieve bilateral
dpa.
Structure is identical on the contrary with pulse recombiner function phase for described pulse separator, and pulse separation/recombiner substantially may be used
It is divided into the two types such as birefringence formula and transmissive versus reflective.Under normal circumstances, birefringence formula pulse separation/recombiner mainly by
Birefringent crystal array constitutes (refer to optics letters, 2007,32 (7): 871-873), and transmissive versus reflective pulse divides
Then mainly it is made up of film polarizer and λ/2 wave plate or 45 ° of Faraday polarization apparatus from/recombiner and (refer to optics
Express, 2012,20 (22): 25121-25129).Assume that pulse separator is made up of n pulse separation unit, then incident
Pulse will produce 2 after pulse separator effectnIndividual subpulse.
Compared with first technology, the present invention has a following distinguishing feature:
1., in cpa-dpa system, by way of multistage dpa connects, improve its Pulse Power Magnification ability.
2. pass through to build dpa regeneration chamber and bilateral dpa module, realize many journeys dpa, improve cpa-dpa system further
Pulse amplifying efficiency.
Brief description
Fig. 1 is high power laser light separation chirped pulse multi-pass amplifier structural representation of the present invention.
Fig. 2 is the dpa regeneration chamber light channel structure schematic diagram of the present invention.
Fig. 3 is the bilateral dpa module light channel structure schematic diagram of the present invention.
Fig. 4 is the light path schematic diagram of transmissive versus reflective pulse separation unit in embodiment.
Specific embodiment
Below by embodiment and accompanying drawing, the invention will be further described, but should not limit the protection model of the present invention with this
Enclose.
Please referring initially to Fig. 1, Fig. 1 is high power laser light separation chirped pulse multi-pass amplifier structural representation of the present invention.
As seen from the figure, high power laser light separation chirped pulse multi-pass amplifier of the present invention, its constitute include laser seed pulse source 1,
Pulse stretcher 2, dpa regeneration chamber 3, bilateral dpa module 4 and pulse shortener 5, laser seed pulse source 1 exports seed pulse,
It is chirped pulse through pulse stretcher 2 broadening, then chamber 3 is regenerated by dpa and bilateral dpa module 4 carries out power amplification to it,
Finally using pulse shortener 5, the chirped pulse after amplifying is compressed.Described pulse stretcher 2 and pulse shortener 3
Can be respectively adoptedType stretcher and treacy type compressor.
Refer to Fig. 2, Fig. 2 is the light channel structure schematic diagram in the dpa regeneration chamber of the present invention.As seen from the figure, the pulse of p polarisation is saturating
Cross the first film polarizer 301 and enter intracavity, sequentially pass through the first Pockels' cell 302, λ/4 wave plate being not powered on pressing
303, the angle between fast (slow) direction of principal axis of described λ/4 wave plate 303 and the polarization direction of p polarisation is 45 °, and then p is inclined
Light pulse is changed into rotatory polarization pulse, rotatory polarization pulse reflect through the one 0 ° of reflecting mirror 304 after again by λ/4 wave plate 303,
Be not powered on the first Pockels' cell 302 pressed, rotatory polarization pulse is changed into s polarisation pulse, the polarization direction of s polarisation pulse perpendicular to
The polarization direction of p polarisation, s polarisation pulse 301 is reflected, then through the first pulse separation/recombiner at the first film polarizer
The line polarisation pulse train that 305 generations are made up of s polarisation pulse and p polarisation pulse, pulse train is situated between in first laser gain
Amplify and pass through the 2nd λ/4 wave plate 307, fast (slow) direction of principal axis of described 2nd λ/4 wave plate 307 and the polarization of p polarisation at matter 306
Angle between direction is 45 °, and then line polarisation pulse train is changed into rotatory polarization pulse train, and rotatory polarization pulse train is through second
Again by the 2nd λ/4 wave plate 307 after the reflection of 0 ° of reflecting mirror 308, rotatory polarization pulse train becomes as inclined by s polarisation pulse and p again
The line polarisation pulse train that light pulse is formed, pulse train is amplified at first laser gain media 306 and is passed through the first arteries and veins
Rush separation/recombiner 305 and synthesize s polarisation pulse, s polarisation pulse is reflected through the first film polarizer 301, then sequentially passes through
Plus the first Pockels' cell 302 of λ/4 voltage, λ/4 wave plate 303, s polarisation pulse is changed into p polarisation pulse, p polarisation pulse
After the reflection of the one 0 ° of reflecting mirror 304 again by λ/4 wave plate 303, plus λ/4 voltage the first Pockels' cell 302, p
Polarisation pulse is changed into s polarisation pulse again, and then s polarisation pulse is just locked in intracavity and continues to amplify, when removing the first bubble gram ear
Amplify pulse transmission output at the first film polarizer 301 after added λ/4 voltage on this box 302.
Refer to Fig. 3, Fig. 3 is the light channel structure schematic diagram of the bilateral dpa module of the present invention.As seen from the figure, p polarisation pulse
After the second film polarizer 401, then through the one 45 ° of Faraday polarization apparatus 402, λ/2 wave plate 403, adjust described
It is still that p is inclined that fast (slow) direction of principal axis of first λ/2 wave plate 403 makes pulse, and the inclined pulse of p continues to pass through the 3rd film polarizer 404,
Then produce, through the second pulse separation/recombiner 405, the line polarisation pulse train being made up of s polarisation pulse and p polarisation pulse,
Pulse train passes through the 2nd 45 ° of Faraday polarization apparatus 407 in the 3rd 0 ° of reflecting mirror after amplifying at second laser gain media 406
Reflect at 408, s polarisation pulse and p polarisation pulse pass twice through the 2nd 45 ° of Faraday polarization apparatus 407 rear polarizer direction and all turn over
90 °, pulse train is amplified at second laser gain media 406 and is synthesized s by the second pulse separation/recombiner 405
Polarisation pulse, s polarisation pulse is anti-through the 3rd film polarizer the 404, the 4th 0 ° of reflecting mirror 409, the 3rd film polarizer 404 successively
After penetrating, produce, through the second pulse separation/recombiner 405, the line polarisation pulse being made up of s polarisation pulse and p polarisation pulse again
Sequence, pulse train passes through the 2nd 45 ° of Faraday polarization apparatus 407, through the 3rd 0 ° after amplifying at second laser gain media 406
Again by the 2nd 45 ° of Faraday polarization apparatus 407 after 408 reflections at reflecting mirror, pulse train is in second laser gain media 406
Place amplifies and synthesizes p polarisation pulse by the second pulse separation/recombiner 405, and p polarisation pulse passes through the 3rd thin film polarization
After mirror 404, continue through the 403, the 1st ° of Faraday polarization apparatus 402 of λ/2 wave plate and be changed into s polarisation pulse, s polarisation arteries and veins
It is punched in reflection output at the second film polarizer 401.
Described pulse separation/recombiner is in series by some transmissive versus reflective pulse separation units.Refer to Fig. 4,
Fig. 4 is the light path schematic diagram of transmissive versus reflective pulse separation unit.As seen from the figure, incident p polarisation or s polarisation pulse pass through
After two λ/2 wave plates 0501, its polarization direction turns over 45 °, and fast (slow) direction of principal axis of described 2nd λ/2 wave plate 0501 is former with light pulse
Angle between polarization direction is 22.5 °, and this light pulse is separated into a p polarisation subpulse via the 4th film polarizer 0502
With a s polarisation subpulse, p polarisation subpulse is through the 4th film polarizer 0502, the 5th film polarizer 0506, s polarisation
Subpulse is inclined through the 4th film polarizer the 0502, the 1st ° of reflecting mirror the 0503, the 2nd 45 ° of reflecting mirror 0504, the 5th thin film successively
Galvanometer 0506 reflects, and the one 45 ° of reflecting mirror 0503 and the 2nd 45 ° of reflecting mirror 0504 are arranged on the first translation stage 0505, pass through
Mobile first translation stage 0505 can change the light path of s polarisation subpulse, and p polarisation subpulse and s polarisation subpulse are via the 5th
Film polarizer 0506 and realize conllinear propagation.Subpulse polarization direction after amplified return all turns over 45 °, i.e. former p polarisation
Subpulse is changed into s polarisation subpulse and s polarisation subpulse is changed into p polarisation subpulse.P polarisation subpulse passes through the 5th thin film polarization
Mirror 0506, the 4th film polarizer 0502, s polarisation subpulse successively through the 0506, the 2nd 45 ° of reflecting mirror 4 of the 5th film polarizer,
One 45 ° of reflecting mirror 0503, the 4th film polarizer 0502 reflect, and p polarisation subpulse and s polarisation subpulse are inclined in the 4th thin film
It is complex as a light pulse, this light pulse is through the polarization direction after the 2nd λ/2 wave plate 0501 and former incidence arteries and veins at galvanometer 0502
The polarization direction of punching is identical or vertical.
Claims (1)
1. a kind of high power laser light separation chirped pulse multi-pass amplifier, is characterised by that its composition includes laser seed pulse source
(1), pulse stretcher (2), dpa regeneration chamber (3), bilateral dpa module (4) and pulse shortener (5), laser seed pulse source
(1) export seed pulse, be chirped pulse through pulse stretcher (2) broadening, then chamber (3) and bilateral dpa mould regenerated by dpa
Block (4) carries out power amplification to it, finally utilizes pulse shortener (5) that the chirped pulse after amplifying is compressed；
The composition that described dpa regenerates chamber (3) includes: is sequentially placed the first film polarizer on incident p polarization direction
(301), the first Pockels' cell (302), λ/4 wave plate (303), the one 0 ° of reflecting mirror (304), described λ/4 wave plate
(303) angle between fast axle or the polarization direction of slow-axis direction and p polarisation is 45 °, returns s polarisation and polarizes in the first film
Mirror (301) place is reflected, and is sequentially placed the first pulse separation/recombiner (305), first laser on s polarisation reflection direction
Gain media (306), the 2nd λ/4 wave plate (307), the 2nd 0 ° of reflecting mirror (308), the fast axle of described 2nd λ/4 wave plate (307) or
Angle between the polarization direction of slow-axis direction and p polarisation is 45 °；
The composition of described bilateral dpa module (4) includes: is sequentially placed the second film polarizer on incident p polarization direction
(401), the one 45 ° of Faraday polarization apparatus (402), λ/2 wave plate, the 3rd film polarizer (404), the second pulse separation/
Recombiner (405), second laser gain media (406), the 2nd 45 ° of Faraday polarization apparatus (407), the 3rd 0 ° of reflecting mirror (408),
Adjust the fast axle of described λ/2 wave plate (403) or slow-axis direction makes emergent light still for p partially, return s polarisation in the 3rd thin film
Polarizer (404) place is reflected, and places the 4th 0 ° of reflecting mirror (409) on s polarisation reflection direction.
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| CN109936041A (en) * | 2019-03-18 | 2019-06-25 | 苏州贝林激光有限公司 | A kind of solid femtosecond amplifying device and its method |
| CN113437621B (en) * | 2021-06-17 | 2022-12-06 | 中国科学院上海光学精密机械研究所 | High-power laser time-space chirped pulse amplification system |
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| CN103560391A (en) * | 2013-11-13 | 2014-02-05 | 上海朗研光电科技有限公司 | High-magnification discrete pulse broadening method for multi-level cascading polarization beam splitting |
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| US8456736B2 (en) * | 2006-12-01 | 2013-06-04 | Cornell University | Divided-pulse amplification of short pulses |
| US8279901B2 (en) * | 2010-02-24 | 2012-10-02 | Alcon Lensx, Inc. | High power femtosecond laser with adjustable repetition rate and simplified structure |
| US8730568B2 (en) * | 2010-09-13 | 2014-05-20 | Calmar Optcom, Inc. | Generating laser pulses based on chirped pulse amplification |
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Non-Patent Citations (1)
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| Energy scaling of femtosecond amplifiers using actively controlled divided-pulsed amplification;Marco Kienel et al.;《Optics Letters》;20140215;第39卷(第4期);1049-1052页 * |
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