CN104064944A - Chemical laser device with seed injection amplification annular resonator - Google Patents
Chemical laser device with seed injection amplification annular resonator Download PDFInfo
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- CN104064944A CN104064944A CN201310095019.4A CN201310095019A CN104064944A CN 104064944 A CN104064944 A CN 104064944A CN 201310095019 A CN201310095019 A CN 201310095019A CN 104064944 A CN104064944 A CN 104064944A
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Abstract
The invention relates to chemical laser device with a seed injection amplification annular resonator, which is provided with the following component successively in the output direction of laser: a plane diffraction grating, a Brewster plate, a gain media region, a Brewster plate, a plano concave output mirror, a plane total reflector mirror, a polarizer, a quarter wave plate, a plano concave back-resonator mirror, an activated media gain region, a plane total reflection mirror, a plane total reflection mirror, a scraper mirror and a plano convex front-resonator mirror. According to the laser device of the invention, seed laser for line selection is coupled with and injected into an annular unstable-resonator chemical laser amplifier through the diffraction grating, and completion between a seed laser mode and an unstable-resonator amplifier resonator die is utilized for realizing controlling of seed laser to an annular unstable-resonator amplifier, and realizing line selection output of larger-power chemical laser. The chemical laser device has advantages of: high light beam quality, high energy, line selection output of the laser, etc. The chemical laser device can be widely applied for the fields of laser material processing, laser physics, laser tag, etc.
Description
Technical field
The invention belongs to chemical laser device field, be specifically related to a kind of seed injection amplification annular chamber chemical laser.
Background technology
Chemical laser is power output and the highest laser of output energy in all lasers up to now.There is the advantages such as high power, high efficiency, good, the good propagation in atmosphere window of amplification performance due to it, there is very wide and important application in fields such as laser physics, laser chemistry, materials processing, laser countermeasure (s)s.At present, many continuous wave chemical lasers, if HF/DF laser, HBr laser etc. are all multiline output, and often require laser with some specific wavelength running in real work, and the running of the singlet of laser becomes very meaningful in this case.
Balzed grating, can shift luminous energy focus on the first-order spectrum with extremely strong dispersive power, is conventionally used in the chamber of laser as route selection device, and the angle that incides balzed grating, glazing by adjustment realizes the output of the laser of required wavelength.Metallic substrates especially water-cooling type metallic substrates balzed grating, has higher anti-damage feature, can be applied in the laser that power is relatively high, but for the laser of high power chemical laser especially long-time continuous running, high power density in chamber still can cause to balzed grating, the damage of unrepairable, thereby cannot realize the route selection output of laser.Adopt the method for seed injection amplification can realize the route selection output of high power laser, but due in this wave-length coverage, there is no very effective smooth shielding system, the feedback light that the standing-wave cavity amplifier conventionally adopting forms still can cause damage to seed laser.And standing-wave cavity intensity noise is large, threshold value is higher, and be unfavorable for the operation of laser single line single mode.
Summary of the invention
The object of the invention is to overcome above-mentioned deficiency, provide a kind of seed to inject annular chamber and amplify chemical laser device, this device can amplify the route selection output that realize high power CW chemical laser by the row ripple by seed laser, have frequency characteristic that high power, noise are low, good and beam quality, can route selection output etc. feature.
For realizing object of the present invention, concrete technical solution is:
A kind of seed injection amplification annular chamber chemical laser device, comprise seed laser, injection amplification level and isolator, the light of exporting in described seed laser enters isolator through the reflection of plane completely reflecting mirror, enters and in described injection amplification level, amplify and the light after amplifying is exported after the unidirectional isolation of isolator;
Described isolator is made up of the polarizer and quarter wave plate; The described polarizer is positioned over adjacent plane completely reflecting mirror one side, and and optical axis between angle be 54.5 °; Described quarter wave plate is positioned over contiguous polarizer opposite side, and perpendicular to optical axis;
Described injection amplification level comprises: plano-concave back cavity speculum, and described plano-concave back cavity speculum center is provided with through hole; Enter active medium gain region for the light after the unidirectional isolation of isolator by through hole, and receive the light of plano-convex ante-chamber speculum output; Active medium gain region, for make through light amplification; Plane total reflective mirror I, amplifies the light of output for reflecting described active medium gain region; Plane total reflective mirror II, for the light of plane of reflection total reflective mirror I output; Scraper mirror, for converging the light of plane total reflective mirror II output, and output that the light amplifying in injection amplification level is coupled on scraper mirror; Plano-convex ante-chamber speculum, for reflexing to described plano-concave back cavity speculum by the light through described scraper mirror.
In technique scheme of the present invention, described seed laser is made up of the plane diffraction grating coaxially arranging, diaphragm, Brewster sheet I, gain medium zone, Brewster sheet II, plano-concave output coupling mirror; Between described plane diffraction grating and plano-concave output coupling mirror, form resonant cavity, both sides, gain medium zone arrange Brewster sheet I and Brewster sheet II, between plane diffraction grating and Brewster sheet I, diaphragm are set; The contiguous described plane completely reflecting mirror of described plano-concave output coupling mirror arranges.
The size of the centre bore of the scraper mirror in the present invention is identical with the size of plano-convex ante-chamber speculum.
The course of work of laser aid of the present invention is as follows: the plane diffraction grating in seed laser, for being placed on electrical turntable, is placed in Littrow mode, and its angle is the corresponding angle of diffraction of route selection wavelength, meets grating equation
(wherein
θ is respectively incidence angle and the angle of diffraction, d be ruling span from and the present invention in d be 1/420mm, m is the order of diffraction time).In the time of laser works, active medium in the seed light gain region being produced by chemical reaction produces excited radiation light, in the time that these radiant lights incide on plane diffraction grating, meeting grating first-order diffraction wavelength Guang Yanyuan road returns, the light of other wavelength diffracted go out outside resonant cavity, between the resonant cavity that the radiant light returning forms at plano-concave coupling mirror and plane diffraction grating, vibration is amplified, and by plano-concave coupling mirror coupling output.Brewster sheet in seed laser makes the oscillation light in chamber become the linearly polarized light that direction of vibration is parallel to the plane of incidence, is used for reducing the light loss in chamber, and it is basic mode that the diaphragm in chamber makes the pattern of the seed laser of output.The seed laser of output is after completely reflecting mirror reflection, after the unidirectional isolation of optical isolator, entered in injection amplification level and amplified by the circular hole in annular chamber amplifier plano-concave Effect of Back-Cavity Mirror, optical isolator plays oscillation light to reflecting in amplifier carries out the effect of unidirectional isolation.When the active medium gain region of the seed light that enters into injection amplification level by amplifier the, extract the active population in gain region, generation stimulated radiation is amplified, radiant light after amplification is reflected by the plane mirror in injection amplification level, plano-convex front cavity mirror, plano-concave Effect of Back-Cavity Mirror, again enter and in active medium gain region, carry out the amplification of row ripple with annular progression, so move in circles, and by scraper mirror coupling output.
Described diffraction grating is metallic substrates balzed grating,, and its groove number is 420 lines/mm, and first-order diffraction efficiency is greater than 97%.
Described plane diffraction grating is placed on electrical turntable.
Described seed laser midplane diffraction grating is placed in Littrow mode, and seed laser vibrates with first-order diffraction, is outputed on described plane completely reflecting mirror by the coupling of plano-concave output coupling mirror.
54.5 ° of angles between described Brewster sheet I and Brewster sheet II and optical axis
The polarizer described in the present invention refers to polarizer known to those of skill in the art.
The present invention has the following advantages:
1, use seed to inject the method for laser amplifier, the control by seed laser to injection amplification level, can obtain the route selection output of high-power chemical laser.
2, laser amplifier adopts annular chamber, has effectively avoided being fed back to and being injected damage and the impact that the too high power density of light path causes seed laser by injection amplification level.And compared with standing-wave cavity, travelling-wave cavity has the advantages such as quality for outputting laser beam is good, intensity noise is low, threshold value is low, be more conducive to the route selection operation of laser.
3, in seed laser, plane diffraction grating is placed in Littrow auto-collimation mode, uses the method for electrical turntable rotating grating to realize route selection output.Laser is with the vibration of grating one-level, and output coupling mirror is exported, and method is simple, easy operating, and it is convenient to inject optical path adjusting.
4, injection amplification level adopts unsteady cavity structure, can obtain good beam quality.
Brief description of the drawings
Fig. 1 is the structural representation that seed of the present invention injects annular chamber amplification chemical laser device.
Embodiment
As shown in drawings, seed injection amplification annular chamber chemical laser device of the present invention, comprise seed laser 1, injection amplification level 2 and isolator 3, in described seed laser 1, the light of output enters isolator 3 through 7 reflections of plane completely reflecting mirror, enters and in described injection amplification level 2, amplify and the light after amplifying is exported after the unidirectional isolation of isolator 3;
Seed laser comprises the plane diffraction grating 11, diaphragm 12, Brewster sheet I 13, seed light gain region 14, Brewster sheet II 15, the plano-concave output coupling mirror 16 that set gradually along Output of laser direction of advance;
Isolator 3 is made up of the polarizer 31 and quarter wave plate 32; The described polarizer 31 is positioned over adjacent plane completely reflecting mirror 7 one sides, and and optical axis a between angle be 54.5 °; Described quarter wave plate 32 is positioned over the contiguous polarizer 31 opposite sides, and perpendicular to optical axis a;
Described injection amplification level 2 comprises: plano-concave back cavity speculum 21, and described plano-concave back cavity speculum 21 centers are provided with through hole; Active medium gain region 22, plane total reflective mirror I 23, plane total reflective mirror II 24, scraper mirror 25, plano-convex ante-chamber speculum 26
Plane diffraction grating 11 in seed laser, for being placed on electrical turntable, is placed in Littrow mode.Making the angle of diffraction of plane diffraction grating 11 by rotating table is the corresponding angle of selected wavelength laser.In the time that seed laser is worked, the active medium of the seed light gain region 14 being produced by chemical reaction produces the excited radiation light of different wave length, while inciding on plane diffraction grating 11 after these radiant lights are by Brewster sheet I 13, diaphragm 12, the light that meets first-order diffraction wavelength is reflected back in chamber along incident direction, the light of other wavelength diffracted go out outside chamber.The radiant light being reflected back is by diaphragm 12, Brewster sheet I 13, seed light gain region 14, Brewster sheet II 15, reflect through plano-concave output coupling mirror 16, and vibration is amplified between the resonant cavity forming at plano-concave output coupling mirror 16 and plane diffraction grating 11, by the be coupled basic mode seed laser of 16 output line polarizations of plano-concave coupling mirror.Seed laser is after completely reflecting mirror 7 reflections, and the optical isolator forming through the polarizer 31, quarter wave plate 32, is entered in injection amplification level and amplified by the circular hole in injection amplification level plano-concave Effect of Back-Cavity Mirror 21.Optical isolator plays amplification light to feeding back in injection amplification level carries out the effect of unidirectional isolation.The seed light that enters into injection amplification level is during through the active medium gain region 22 of injection amplification level, and the active population in the gain region that while extracting injection amplification level work, chemical reaction produces, produces stimulated radiation and amplify.Radiant light after amplification is reflected by plane total reflective mirror I 23, plane total reflective mirror II 24, through scraper mirror 25, reflects and again enters active medium gain region 22 and amplify through plano-convex front cavity mirror 26, plano-concave back cavity speculum 21, so moves in circles.Seed laser vibration in by plano-concave Effect of Back-Cavity Mirror 21, plane total reflective mirror I 23, plane total reflective mirror II 24 reflects, plano-convex front cavity mirror 26 forms annular unsteady cavity is amplified, and finally, by scraper mirror 25 output that is coupled, obtains high-power route selection laser.
The present invention realizes the route selection output of high power CW chemical laser to the control of injection amplification level by seed laser, laser amplifier adopts annular unsteady cavity structure, have loss is little, power is high, good beam quality, can route selection output etc. feature, and can not cause damage to seed laser.The present invention can be applied to HF/DF laser, HBr laser and pneumatic CO
2the systems such as laser.
Claims (5)
1. a seed injection amplification annular chamber chemical laser device, it is characterized in that comprising seed laser (1), injection amplification level (2) and isolator (3), in described seed laser (1), the light of output enters isolator (3) through plane completely reflecting mirror (7) reflection, enters and in described injection amplification level (2), amplify and the light after amplifying is exported after the unidirectional isolation of isolator (3);
Described isolator (3) is made up of the polarizer (31) and quarter wave plate (32); The described polarizer (31) is positioned over adjacent plane completely reflecting mirror (7) one sides, and and optical axis (a) between angle be 54.5 °; The contiguous polarizer (31) opposite side of described quarter wave plate (32), and place perpendicular to optical axis (a) direction;
Described injection amplification level (2) comprising: plano-concave back cavity speculum (21), and described plano-concave back cavity speculum (21) center is provided with through hole; Enter active medium gain region (22) for the light after the unidirectional isolation of isolator (3) by through hole, and receive the light of plano-convex ante-chamber speculum (26) output; Active medium gain region (22), for make through light amplification; Plane total reflective mirror I (23), amplifies the light of output for reflecting described active medium gain region (22); Plane total reflective mirror II (24), for the light of plane of reflection total reflective mirror I (23) output; Scraper mirror (25), for converging the light of plane total reflective mirror II (24) output, and exports the light amplifying in injection amplification level in the upper coupling of scraper mirror (25); Plano-convex ante-chamber speculum (26), for reflexing to described plano-concave back cavity speculum (21) through the light of described scraper mirror (25).
2. seed injection amplification annular chamber chemical laser device according to claim 1, is characterized in that: described seed laser (1) is made up of the plane diffraction grating coaxially arranging (11), diaphragm (12), Brewster sheet I (13), gain medium zone (14), Brewster sheet II (15), plano-concave output coupling mirror (16); Between described plane diffraction grating (11) and plano-concave output coupling mirror (16), form resonant cavity, both sides, gain medium zone (14) arrange Brewster sheet I (13) and Brewster sheet II (15), between plane diffraction grating (11) and Brewster sheet (13), diaphragm (12) are set; The contiguous described plane completely reflecting mirror of described plano-concave output coupling mirror (16) (7) arranges.
3. seed injection amplification annular chamber chemical laser device according to claim 1, is characterized in that: described seed laser is single mode linearly polarized light.
4. seed injection amplification annular chamber chemical laser device according to claim 2, it is characterized in that: described seed laser (1) midplane diffraction grating (11) is placed in Littrow mode, seed laser vibrates with first-order diffraction, is outputed on described plane completely reflecting mirror (7) by plano-concave output coupling mirror (16) coupling.
5. seed injection amplification annular chamber chemical laser device according to claim 2, is characterized in that: described diffraction grating (11) is placed on electrical turntable.
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| CN201310095019.4A CN104064944B (en) | 2013-03-22 | 2013-03-22 | Chemical laser device with seed injection amplification annular resonator |
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| CN201310095019.4A CN104064944B (en) | 2013-03-22 | 2013-03-22 | Chemical laser device with seed injection amplification annular resonator |
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| CN104064944B CN104064944B (en) | 2017-02-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785854A (en) * | 2015-11-23 | 2017-05-31 | 中国科学院大连化学物理研究所 | A kind of hydrogen fluoride optical maser wavelength selection output Foldaway unstable resonator |
| CN106785855A (en) * | 2015-11-23 | 2017-05-31 | 中国科学院大连化学物理研究所 | A kind of high efficiency hydrogen fluoride laser grating unsteady cavity |
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| US3753147A (en) * | 1972-06-23 | 1973-08-14 | Union Carbide Corp | Laser oscillator-amplifier system |
| US3919663A (en) * | 1974-05-23 | 1975-11-11 | United Technologies Corp | Method and apparatus for aligning laser reflective surfaces |
| US4267524A (en) * | 1979-03-08 | 1981-05-12 | Paxton Alan H | Unstable optical resonator with self-imaging aperture |
| US4490823A (en) * | 1983-03-07 | 1984-12-25 | Northrop Corporation | Injection-locked unstable laser |
| EP1647075A1 (en) * | 2003-05-07 | 2006-04-19 | Federalnoye Gosudarstvennoye Unitarnoye Predpriyatiye Nauchno-Issledovateskiy Institut Lazernoy Fiziki | Laser with hybrid-unstable ring resonator |
| CN100536262C (en) * | 2005-09-29 | 2009-09-02 | 中国科学院光电技术研究所 | Automatic calibrating device for positive branch confocal unstable resonator mirror |
| CN102810810A (en) * | 2012-03-02 | 2012-12-05 | 中国科学院光电研究院 | Single-cavity dual-electrode discharging cavity and quasimolecule laser |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106785854A (en) * | 2015-11-23 | 2017-05-31 | 中国科学院大连化学物理研究所 | A kind of hydrogen fluoride optical maser wavelength selection output Foldaway unstable resonator |
| CN106785855A (en) * | 2015-11-23 | 2017-05-31 | 中国科学院大连化学物理研究所 | A kind of high efficiency hydrogen fluoride laser grating unsteady cavity |
| CN106785854B (en) * | 2015-11-23 | 2019-01-25 | 中国科学院大连化学物理研究所 | A kind of hydrogen fluoride optical maser wavelength selection output Foldaway unstable resonator |
| CN106785855B (en) * | 2015-11-23 | 2019-01-25 | 中国科学院大连化学物理研究所 | A kind of high efficiency hydrogen fluoride laser grating unsteady cavity |
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