CN2498770Y - Laser multi-channel pre-amplifier - Google Patents
Laser multi-channel pre-amplifier Download PDFInfo
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- CN2498770Y CN2498770Y CN 01229194 CN01229194U CN2498770Y CN 2498770 Y CN2498770 Y CN 2498770Y CN 01229194 CN01229194 CN 01229194 CN 01229194 U CN01229194 U CN 01229194U CN 2498770 Y CN2498770 Y CN 2498770Y
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Abstract
The utility model relates to an impulse laser amplifier which is mainly composed of two pairs of confocal concave mirrors with different curvature radii, a laser amplification medium arranged on a confocal point, two total reflecting mirrors with a 45 DEG broadband and two focusing lenses. Because of the different curvature radii of the concave mirrors, a beam diameter after aligned by the concave mirror is decreased after each focusing is amplified by one pass, a spot diameter re-focused in the amplification medium is increased, and thus the high amplification efficiency is realized. The utility model can realize high energy output and extremely short pulse width amplification. The cost is low, and the regulation is convenient.
Description
The utility model relates to laser technology field, particularly relates to a kind of impulse laser amplifier.
The chirped pulse amplification that is used to produce ultra-intense ultra-short laser pulse is the at present tool innovation ability of discovery and one of the research tool of new subject of growing, (document 1 since D.Strickland in 1985 and G.Mourou propose this amplification thought, D.Strickland, G.Mourou, Opt.Commun; Vol.56,219 (1985)), people have improved 7 magnitudes in the laser peak power that can realize on the ordinary optical platform the short several years, and have obtained peak power greater than 100TW (terawatt (TW), 1TW=10 in several laboratories
12W) even up to result (document 2, K.Yamakawa, the et al of 1.5PW; Opt Lett., Vol.23,1468 (1998), document 3, M.D.Perry et al; Opt Lett., Vol.24,160 (1999)).Usually, typical chirped pulse amplification CPA (abbreviation of Chirped-Pulse Amplification) mainly is made up of oscillator (Oscillator), pulse stretcher (Stretcher), amplifier (Amplifier) and recompression device (Compressor) four parts.Its basic course of work is: at first by oscillator produce femtosecond (be fs, 1fs=10
-15Second) seed laser pulse 01 of magnitude pulsewidth, utilize then stretcher with positive dispersion with its broadening be hundreds of psecs (be ps, 1ps=10
-12Second) chirped pulse 02, it is constant to keep its spectral width simultaneously, the amplification pulse 03 that has improved greatly through necessary amplification produce power once more, utilize at last with the stretcher chromatic dispersion mutually the compressor reducer of inverse with its counteracting of warbling, thereby obtain the amplification result 04 close with the seed pulsewidth.This shows that amplifier conduct core wherein for the result of last acquisition high-peak power, has crucial effect.
Early stage femtosecond amplification system reaches the device that is used for ultrafast phenomena research at present and generally all adopts one-level to amplify form.In order to pursue high peak power, remove one-level and amplify in recent years, outside promptly pre-the amplification, people also usually need further to adopt multistage amplification.But which kind of scheme no matter, prime amplifier as a whole in the amplification system essential and part that gain is the highest (gain is 10 usually
6～10
7About), the height of its efficient is for ultra-fast applications research and further have great importance by the desirable output energy of multistage amplification (common every grade gain is about 10) acquisition and act on.The scheme of prime amplifier employing so far has regenerative amplification and Duo Tong to amplify dual mode, and wherein amplification means (document 4, the F.Salinet al that conduct is adopted the earliest amplified in regeneration in advance; Opt Commun., Vol.84,67 (1991), document 5, S.Takeuchi, T.Kobayashi; Opt Comm, Vol.109,518 (1994)) have the efficient height, regulate advantages such as easy, that output beam quality is good, but, therefore be difficult to obtain extremely short compression result because this scheme exists gain narrowing effect and material dispersion.In recent years along with to amplifying the requirement that pulse duration constantly narrows, people begin generally to adopt and have how logical pre-amplification scheme (document 6, the J.Zhou et al that material dispersion is little, the spectrum narrowing effect is weak; Opt Lett., Vol.20,66 (1995), document 7, S.Sartania et al; .Opt Lett., Vol.22,1562 (1997), document 8, Y.H.Cha etal; J.Opt.Soc.Am.B, Vol.16,1220 (1999)).But the amplification efficient that general problem is this scheme is low than regenerative amplification, and because what adopt is the spherical reflector of symmetry, therefore after the amplification of one-period, light will spatially overlap and can't further amplify from being in harmony with light path before amplifying, usually have to adopt plane 45 degree speculums so that amplify light for this reason, increased the loss and the complexity of system laterally separately.In addition, generally adopt two spherical mirrors to constitute in existing many logical amplifications and amplify light path, therefore remove size must big (diameter often requires greater than 10cm), the centre also must perforate or plate Double-color film with the transmission pumping laser, not only difficulty of processing is big, cost is high, and because the adjusting degree of freedom is little, practical operation is also relatively more difficult, considers inevitable error and optical aberration in the processing, also exists limitation on amplification efficient.
The purpose of this utility model is to amplify in the research at present femtosecond laser, lead to amplified the shortcomings that efficient are low, regulate difficulty in advance, provides a kind of and leads to prime amplifier by the confocal spherical reflector of two pairs of different curvature radius and the Fs chirp pulse that places the laser amplification medium on the confocal point to form more.The utility model cost is low, easy to adjust, amplification efficient height, can realize the amplification result of high power output, utmost point short pulse duration.
The purpose of this utility model is achieved in that
The utility model is mainly spent total reflective mirrors and pump light focusing and reflecting system and is formed by two pairs of different confocal concave mirror, a laser amplification medium, two broadbands 45 of radius of curvature.
As shown in Figure 2, laser gain amplifier medium 09 selects the ti sapphire laser crystal, is of a size of 5 * 5 * 9mm, can be Brewster angle cutting or perpendicular cuts in horizontal plane, is placed on the adjusting bracket and translation stage of the scalable pitching and the anglec of rotation.10,11 is the identical a pair of concave mirror of curvature, 12,13 be radius of curvature identical but with 10,11 slightly different another to concave mirror.Total reflective mirror 10,11 is placed respectively on adjustable micropositioning stage of bidimensional and the translation guide rail, their bore is φ 25～35mm, centre-to-centre spacing is 70mm, thickness is 5mm, material is a K9 glass, distance apart from the laser crystal center is 520mm, and film is all-trans in the broadband that their reflecting surface is coated with 700～900nm wave band.Total reflective mirror 12,13 is placed respectively on the adjustable micropositioning stage of bidimensional, the broadband that its reflecting surface the is coated with 700～900nm wave band film that is all-trans, bore is φ 25～35mm, centre-to-centre spacing is 70mm, thickness is 5mm, and material is a K9 glass, is 465mm apart from the centre distance of laser crystal; They are 0.8～0.9: 1 with the ratio of 10,11 radius of curvature, and the phase mutual edge distance is half of two radius of curvature sums.14,15 for spending the level crossing that is all-trans to pump light 45.With size 20 * 5mm, the strip broadband level crossing 14 of thickness 2mm is fixed on the bidimensional adjustable little micropositioning stage and transversely movable guide rail, and its material is a K9 glass.With size 20 * 20mm, the square broadband level crossing 15 of thickness 5mm places on the adjustable micropositioning stage of bidimensional, and its material is a K9 glass.16,19 for spending the level crossing that is all-trans to amplifying laser 45.The circular flat mirror 16 of bore φ 25.4mm is placed on the adjustable micropositioning stage of bidimensional, and material selects K9 glass.Level crossing 19 focal lengths are 1000～1200mm, and bore is φ 25.4mm, and material is a K9 glass, are 700mm apart from the distance at laser crystal 09 center, can select two directional pump or unidirectional pumping as required.17,18 is the long-focus condenser lens, pumping laser is coupled into laser gain amplifier medium 09 through 45 degree total reflective mirrors and condenser lens, in order to prevent the damage of crystal, need select the focal length of lens 17 and 18 to reach the distance of laser gain amplifier medium 09 according to the damage threshold of used laser gain amplifier medium, to guarantee to incide pump spot in the crystal in necessarily required scope, existing enough pumping density also realizes and the best pattern match of amplifying light, but do not damage crystal, promptly focus drops on after the amplification medium.
Concrete amplification process is: pump light 24,23 is focused into through lens 18,17 respectively and is mapped on the speculum 19,16, and reverberation incides on the laser medium 09, and laser medium absorptive pumping light reaches magnifying state; Seed laser 20 at first to be amplified incides on the concave mirror 15, and after concave mirror 11 reflects, incide in the amplification crystal 09 by its reflect focalization, incide on the concave mirror 12 through once amplifying the back, because the radius of curvature of concave mirror 12 is 0.8～0.9 times of concave mirror 11 radius of curvature and is confocal arrangement between the two, therefore the one way amplification light after concave mirror 12 reflections will be that diameter is reduced to 0.8～0.9 times collimated light, and can collimated light and the light path parallel ground that eyeglass 15 reflection backs arrive concave mirrors 11 be incided on the concave mirror 10 by regulating concave mirror 12, adjusting 10 makes laser focus on laser gain amplifier medium 09 once more to carry out the amplification second time.Compare with amplification for the first time, because the beam diameter before amplifying has reduced 0.8～0.9 times, so the focal beam spot that secondary is amplified in the crystal will be increased to 1.1～1.25 squares doubly.Same principle, the laser after round trip is amplified will be that diameter reduces 0.8～0.9 times collimated light and can pass through equally to regulate concave mirror 13 once more after concave mirror 13 reflections, make reverberation incide concave mirror 11 once more abreast, thereby form an amplification cycle.With amplify before compare, before the diameter boil down to of being not difficult to find out light beam not only amplifies 0.8～0.9 square doubly, and light beam spatially separately and to crystal is drawn close automatically, like this in the secondary that carries out new one-period amplifies, light will repeat the transmission course of one-period, because the continuous compression of beam diameter, each focal beam spot in crystal constantly enlarges with square multiplying power of radius of curvature inverse ratio, thereby the quick growth of energy density and the gain saturation effect that causes have thus been slowed down relatively, help amplifying the raising of efficient, just two cycles of drawing among Fig. 2, the situation that four-way amplifies, the collimate in parallel light of Fang Daing reflects pre-amplification system through a little eyeglass 14 at last, similarly, if realize that further 6 is logical, 8 is logical, even more amplify number of passes, only need be parallel to seed laser 20, moving little eyeglass 14 along laser gain amplifier medium direction gets final product.
The utility model is owing to adopt radius of curvature two groups of spherical mirrors slightly inequality, and therefore the light behind every Cheng Fangda spatially will one by one naturally separately have been avoided the problem that light path overlaps in the existing scheme.The spot size that focuses on the amplification light in the gain amplifier medium in the utility model is pursued Cheng Zengjia, thereby has weakened the quick raising of energy density, has suppressed the gain saturation efficient of medium, and amplifying for high efficiency provides possibility.The utility model adopts a pair of spherical mirror to replace single spherical mirror, thereby has reduced the requirement of lens dimension greatly and avoided the technical problem of plating Double-color film or perforate, and cost is low, and is easy to adjust.
Below in conjunction with drawings and Examples the utility model is described in detail:
The General Principle figure that Fig. 1 amplifies for chirped pulse,
Fig. 2 is the schematic diagram of the utility model implementation method,
Fig. 3 is one of embodiment of the present utility model,
Fig. 4 schematic diagram of actual hot spot on the end mirror sheet during to be that the utility model eight is logical amplify.
Embodiment 1:
As shown in Figure 3, the concrete parameter and the installation requirement of each element are as follows:
09 is laser gain amplifier medium, adopts the ti sapphire laser crystal of 5 * 5 * 9mm, is the Brewster angle cutting in horizontal plane, places on the adjusting bracket and translation stage of the scalable pitching and the anglec of rotation.10,11 is the spherical reflector of radius of curvature 1039mm, and reflecting surface is coated with the broadband 0 of 700～900nm wave band and spends the film that is all-trans, and material is the K9 glass of bore φ 30mm, thickness 5mm, and centre-to-centre spacing is 70mm.Place respectively on adjustable micropositioning stage of bidimensional and the translation guide rail, be about 520mm with the distance at ti sapphire crystal center.12,13 is the spherical reflector of radius of curvature 931mm, be about 0.9: 1 with the ratio of 10,11 radius of curvature, reflecting surface is coated with the broadband 0 of 700～900nm wave band and spends the film that is all-trans, bore is φ 30mm, centre-to-centre spacing is 70mm, and thickness is 5mm, and material is a K9 glass, place respectively on the adjustable micropositioning stage of bidimensional, with the distance at ti sapphire crystal center be 465mm.14 is the strip broadband level crossing that under the 45 degree incidence angles 700～900nm is all-trans, and is of a size of 20 * 5mm, thickness 2mm, and material is a K9 glass, is fixed on the bidimensional adjustable little micropositioning stage and transversely movable guide rail.15 is the square broadband level crossing that under the 45 degree incidence angles 700～900nm is all-trans, and is of a size of 20 * 20mm, thickness 5mm, and material is a K9 glass, places on the adjustable micropositioning stage of bidimensional.16 is the circular flat mirror that under the 45 degree incidence angles 532nm is all-trans, and bore is φ 25.4mm, and material selects K9 glass, places on the adjustable micropositioning stage of bidimensional.17 for to be coated with the convergent lens that 532nm is all-trans, and focal length is 1200mm, and bore is φ 25.4mm, and material selects K9 glass, is 700mm apart from the distance at laser crystal center.
Concrete amplification process is: seed laser 20 at first to be amplified through eyeglass 15 reflection after concave mirror 11 reflect focalizations to amplifying in the crystal 09, under the effect of assembling pumping laser 23, the laser experience is once amplified and is incided on the concave mirror 12, because the radius of curvature of concave mirror 12 is less than concave mirror 11, therefore the one way amplification light beam 24 after concave mirror 12 reflections will be that diameter has reduced 0.9 times collimated light, and can light beam 24 and light beam 21 be incided on the concave mirror 10 abreast by regulating concave mirror 12, regulate concave mirror 10 make laser once more reflect focalization carry out the amplification second time to crystal 09.Compare with amplification for the first time, because the beam diameter before amplifying has reduced 0.9 times, therefore secondary be amplified in focal beam spot in the crystal will increase by 0.9 square times, and become equally diameter and reduce 0.9 times collimated light beam 25 once more and incide abreast on the concave mirror 11 by regulating concave mirror 13 and light beam 21 equally through concave mirror 13 reflection backs, and on minute surface, separate automatically with light beam 21, form an amplification cycle.Similarly, to increase 0.9 times and obtain amplification for the third time once more through the concave mirror 11 reflection back gathering hot spot of light in crystal, if confocal between two arrangements of mirrors transferred enough accurately by translation stage, after concave mirror 12 reflection, will become parallel so automatically but diameter has reduced 0.9 times collimated light beam 26 with light beam 24, so constantly amplify, every amplification one journey, collimated beam diameter reduces 0.9 times, the spot diameter of assembling in the crystal increase 0.9 square doubly.Amplify light beam and pass through light path 27,28,29,30 successively, after 8 logical backs become light beams 31 and reflect system by rectangular mirror 14, thereby finish pre-amplification process.
Adopt the frequency multiplication Nd:YAG laser of energy 35mJ, pulsewidth 7ns, repetition rate 10Hz to do pumping, the about 2nJ of the single pulse energy of incident seed light 20, obtained the highest output that pulse energy reaches 8mJ behind 8 logical the amplifications, corresponding amplification efficient is about 23%, and gain reaches 4 * 10
6This result is not only far above the how logical amplification result (document 6～8) of present finding report, and near the best level (document 5) of regenerative amplification, confirmed validity of the present utility model.
Claims (2)
1, a kind of femtosecond laser leads to prime amplifier more, it is characterized in that: by laser gain amplifier medium (09), two pairs of confocal concave mirror (10), (11) and (12), (13) that radius of curvature is different, two level crossing (14), (15) that pump light 45 degree are all-trans, two block length focal length condenser lenses (17), (18), two level crossing (16), (19) that amplifying laser 45 degree are all-trans are formed;
Laser gain amplifier medium (09) is placed on the adjusting bracket and translation stage of the scalable pitching and the anglec of rotation; (10), (11) be the identical a pair of concave mirror of curvature, (12), (13) are that identical but slightly different with (10), (11) another of radius of curvature is to concave mirror; Total reflective mirror (10), (11) are placed respectively on adjustable micropositioning stage of bidimensional and the translation guide rail; Total reflective mirror (12), (13) are placed respectively on the adjustable micropositioning stage of bidimensional, and they are 0.8～0.9: 1 with the ratio of the radius of curvature of (10), (11), and the phase mutual edge distance is half of two radius of curvature sums; Strip broadband level crossing (14) is fixed on the bidimensional adjustable little micropositioning stage and transversely movable guide rail; Square broadband level crossing (15) is placed on the adjustable micropositioning stage of bidimensional; Circular flat mirror (16) is placed on the adjustable micropositioning stage of bidimensional; Level crossing (19) is 700mm apart from the distance at laser crystal (09) center, can select two directional pump or unidirectional pumping as required; Select the focal length of lens (17) and (18) to reach the distance of laser gain amplifier medium (09) according to the damage threshold of used laser gain amplifier medium, drop on amplification medium (09) afterwards to guarantee focus;
Concrete amplification process is: pump light (24), (23) are focused into through lens (18), (17) respectively and are mapped on speculum (19), (16), and reverberation incides on the laser medium (9), and laser medium absorptive pumping light reaches magnifying state; At first seed laser (20) incides on the concave mirror (15), and after concave mirror (11) reflects, incide in the amplification crystal (09) by its reflect focalization, after once amplifying, incide on the concave mirror (12), regulate concave mirror (12) collimated light and the light path parallel ground that level crossing (15) reflection back arrives concave mirror (11) are incided on the concave mirror (10), adjusting (10) makes laser focus on laser gain amplifier medium (09) once more to carry out the amplification second time; After round trip is amplified, same by regulating concave mirror (13), make reverberation incide concave mirror (11) once more abreast and form an amplification cycle; Carry out an amplification cycle again by above-mentioned amplification process, the collimate in parallel light of Fang Daing reflects pre-amplification system through a facet mirror (14) at last.
2, lead to prime amplifier by the described femtosecond laser of claim 1 more, it is characterized in that: further realize 6 logically, 8 logical even more amplify number of passes, only need be parallel to seed laser (20), move facet mirror (14) along laser gain amplifier medium (09) direction and get final product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01229194 CN2498770Y (en) | 2001-06-27 | 2001-06-27 | Laser multi-channel pre-amplifier |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01229194 CN2498770Y (en) | 2001-06-27 | 2001-06-27 | Laser multi-channel pre-amplifier |
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| CN2498770Y true CN2498770Y (en) | 2002-07-03 |
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| CN 01229194 Expired - Fee Related CN2498770Y (en) | 2001-06-27 | 2001-06-27 | Laser multi-channel pre-amplifier |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100364184C (en) * | 2004-12-31 | 2008-01-23 | 中国科学院西安光学精密机械研究所 | Laser impulse amplification system |
| CN102882117A (en) * | 2012-09-24 | 2013-01-16 | 中国科学院物理研究所 | All-solid-state picosecond laser multipass amplifier |
| CN103066488A (en) * | 2012-12-29 | 2013-04-24 | 深圳大学 | Multipass amplification system of ultrashort pulse laser |
| CN103972777A (en) * | 2014-04-23 | 2014-08-06 | 中国科学院物理研究所 | Laser multi-pass amplifier |
| CN109256666A (en) * | 2017-07-12 | 2019-01-22 | 中国科学院电子学研究所 | The Fe of non-chain pulsed HF laser pump (ing)2+: ZnSe laser |
| CN110034485A (en) * | 2019-05-21 | 2019-07-19 | 南京钻石激光科技有限公司 | A kind of the multi-way image intensifer and method of multiple gain medias |
| CN110556697A (en) * | 2019-09-12 | 2019-12-10 | 河南省启封新源光电科技有限公司 | High-efficiency laser multi-pass amplifying device |
-
2001
- 2001-06-27 CN CN 01229194 patent/CN2498770Y/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100364184C (en) * | 2004-12-31 | 2008-01-23 | 中国科学院西安光学精密机械研究所 | Laser impulse amplification system |
| CN102882117A (en) * | 2012-09-24 | 2013-01-16 | 中国科学院物理研究所 | All-solid-state picosecond laser multipass amplifier |
| CN102882117B (en) * | 2012-09-24 | 2014-11-05 | 中国科学院物理研究所 | All-solid-state picosecond laser multipass amplifier |
| CN103066488A (en) * | 2012-12-29 | 2013-04-24 | 深圳大学 | Multipass amplification system of ultrashort pulse laser |
| CN103066488B (en) * | 2012-12-29 | 2014-10-22 | 深圳大学 | Multipass amplification system of ultrashort pulse laser |
| CN103972777A (en) * | 2014-04-23 | 2014-08-06 | 中国科学院物理研究所 | Laser multi-pass amplifier |
| CN103972777B (en) * | 2014-04-23 | 2017-12-26 | 中国科学院物理研究所 | Laser multi-pass amplifier |
| CN109256666A (en) * | 2017-07-12 | 2019-01-22 | 中国科学院电子学研究所 | The Fe of non-chain pulsed HF laser pump (ing)2+: ZnSe laser |
| CN110034485A (en) * | 2019-05-21 | 2019-07-19 | 南京钻石激光科技有限公司 | A kind of the multi-way image intensifer and method of multiple gain medias |
| CN110556697A (en) * | 2019-09-12 | 2019-12-10 | 河南省启封新源光电科技有限公司 | High-efficiency laser multi-pass amplifying device |
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |