CN103117505A - Laser amplifier and method for improving light beam quality - Google Patents
Laser amplifier and method for improving light beam quality Download PDFInfo
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- CN103117505A CN103117505A CN2013100263036A CN201310026303A CN103117505A CN 103117505 A CN103117505 A CN 103117505A CN 2013100263036 A CN2013100263036 A CN 2013100263036A CN 201310026303 A CN201310026303 A CN 201310026303A CN 103117505 A CN103117505 A CN 103117505A
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Abstract
The invention discloses a laser amplifier for improving light beam quality, and so that the light beam quality of the laser amplifier can be improved obviously. The invention further discloses a method for improving the light beam quality based on the laser amplifier. The adjustment of the position of an amplifier stage can effectively control the light beam quality of amplifier stage output. Not only can experimental apparatus be simplified, light path length is greatly shortened, laser power is guaranteed to be amplified, and meanwhile, the improvement of the light beam quality can be achieved. Namely, light beam quality which is output from an oscillator stage is poor, the light beam quality after the amplifier stage is improved, and therefore the whole device can obtain high power laser output with good performance.
Description
Technical field
The present invention relates to the Solid State Laser technology, be specifically related to a kind of raising by the devices and methods therefor of laser amplifier beam quality.
Background technology
High power laser light output for excellent, the laser amplifier system of using oscillator stage-amplifier composition is a kind of good method, can determine its beam characteristics by oscillator stage in this method, and determine its power output by amplifier, therefore can take into account good laser characteristics and higher power output.Existing laser amplification technique generally adopts and adds the beam expanding telescope system to realize two inter-stage beam diameters couplings between oscillator stage-amplifier, as shown in Figure 1, the light beam that the beam radius that oscillator stage is sent is less, amplify through entering in amplifier again after beam expanding telescope, can obtain high power output like this.
There are two weak points in such structure, and the one, need to add the beam expanding telescope system between oscillator stage-amplifier, increased the length of light path, make the whole system volume ratio huger; The 2nd, in the situation that high power pump, because the thermal effect that exists in gain media in amplifier can cause producing distortion by the light beam of amplifier gain medium, severe exacerbation the beam quality of Output of laser.
Recently, we find in patent CN 100495836 C described " a kind of device of the asymmetric laserresonator of basic mode dynamic stability of two-rod series connection ", and the beam quality difference of resonant cavity two ends output beam is larger.The distance of definition from the laser crystal to the resonant cavity mirror is the resonant cavity brachium, in the asymmetric laserresonator of basic mode dynamic stability, two brachium difference of resonant cavity are larger, fine from the beam quality of the long end output beam of brachium, and relatively poor from the beam quality of the shorter end output beam of brachium.To laser generation level-amplifier system, make oscillator stage from the relatively poor light beam of beam quality of galianconism output this application of principle, disperse by amplifying stage, can when guaranteeing larger power output, obtain good beam quality.
Summary of the invention
Make present situation by beam quality variation after laser amplifier for thermal effect long due to light path in prior art or gain medium, the invention provides a kind of raising by the device of laser amplifier beam quality.
A kind of laser amplifier that improves beam quality, comprise oscillator stage and amplifying stage, described oscillator stage comprises total reflective mirror, the first gain medium and the outgoing mirror that sets gradually, distance between described total reflective mirror and the first gain medium is L1, the distance of the first gain medium and outgoing mirror is L2, and L1＞L2;
The distance of described amplifying stage and outgoing mirror is L3, and L3 equals the thermal focal length of amplifying stage.
The present invention's laserresonator is set to asymmetric manner, namely the distance of the first gain medium and total reflective mirror is greater than the distance between the first gain medium and outgoing mirror, make from the laser beam quality of outgoing mirror output relatively poor, but by adjusting the position of amplifying stage, when the light beam that makes outgoing mirror export enters amplifying stage again after dispersing, will obviously improve beam quality.
Be to guarantee the quality of output beam, as preferably, greater than 95%, described outgoing mirror is 1%～98% to the reflectivity of laser beam to described total reflective mirror to the reflectivity of laser beam.
Find after deliberation, when the distance of the first gain medium and total reflective mirror greater than the distance between outgoing mirror and the first gain medium (when being L1＞L2), the outgoing beam of outgoing mirror second-rate, but this light beam enters amplifying stage to be amplified, become better from the beam quality of amplifying stage output, as preferably, L1 is 3～5 times of L2.
As preferably, described the first gain medium is Nd:YAG crystal, Nd:YVO
4Crystal or Yb:YAG crystal.
In like manner, described amplifying stage comprises the second gain medium, and described the second gain medium is Nd:YAG crystal, Nd:YVO
4Crystal or Yb:YAG crystal.This second gain medium can be identical with the first gain medium, also can be different.
As preferably, the thermal focal length of described the second gain medium is 10mm-2000mm, determines distance between amplifying stage and outgoing mirror to be beneficial to the Laser output that obtains high light beam quality according to the thermal focal length of this second gain medium.
The present invention also provides a kind of method that improves beam quality based on above-mentioned laser amplifier, makes the light beam through amplifying stage output have beam quality preferably.
A kind of method of the raising beam quality based on laser amplifier, described laser amplifier comprises oscillator stage and amplifying stage, described oscillator stage comprises total reflective mirror, the first gain medium and the outgoing mirror that sets gradually; Distance in described oscillator stage between total reflective mirror and the first gain medium is L1, and the distance between the first gain medium and outgoing mirror is L2, and L1＞L2;
Described method comprises:
1) according to the thermal focal length of the operating point determination amplifying stage of amplifying stage;
2) adjust the position of amplifying stage, make the distance L 3 of amplifying stage and outgoing mirror equal the thermal focal length of amplifying stage;
3) emergent ray of outgoing mirror is exported as laser beam by after amplifying stage.
Compared with prior art, the present invention has following beneficial effect:
(1) simplified experimental provision, greatly shortened optical path length, the volume of whole device is greatly reduced.
(2) not only can realize the amplification of laser power, can also realize the improvement to beam quality, namely relatively poor from the beam quality of oscillator stage output, obtained raising by beam quality after amplifying stage, thereby made the high power laser light output of whole device excellent.
Description of drawings
Fig. 1 be in prior art light beam through entering the spot radius distribution map in amplifying stage after the beam expanding telescope system;
Fig. 2 is device and the index path thereof that improves in the present invention by the laser amplifier beam quality;
Fig. 3 is by the surface of intensity distribution of oscillator stage output beam in embodiment 1;
Fig. 4 is the curve chart of measuring in embodiment 1 through the beam quality factor of output beam after amplifying stage;
Fig. 5 is through the surface of intensity distribution of output beam after amplifying stage in embodiment 1.
Embodiment
Embodiment 1
As shown in Figure 2, be placed with successively total reflective mirror 1, oscillator stage gain media (the first gain medium) 2, outgoing mirror 3, stage gain medium (the second gain medium) 5 along optical axis.
The oscillator stage gain media adopts the Nd:YVO of both-end pumping
4Crystal, crystal are the a-cut cutting, and doping content is 0.3%, Nd:YVO
4Laser crystal is of a size of 3mm * 3mm * 11mm, wherein the two ends bonding the thick not doping YVO of 2mm
4Crystal, main crystal end-face deformation in order to reduce to cause because of thermal effect.After utilizing the pump light coupling of Lens Coupling system with 808nm, from the incident of crystal both ends of the surface, pump light is at Nd:YVO
4The beam diameter of laser crystal end face is 0.8mm, and the centre wavelength of pump light can be by regulating Temperature-controlled appliance, to reach the effective coupling with the absorption of crystal peak.
Oscillator stage adopts the asymmetric laserresonator of basic mode dynamic stability.Distance between total reflective mirror 1 and the first gain medium 2 is L1=310mm, the distance L 2=85mm of the first gain medium 2 and outgoing mirror 3.Total reflective mirror 1 is coated with the 1064nm high-reflecting film, and greater than 99.5%, outgoing mirror 3 is 60% at the reflectivity at 1064nm place to the reflectivity of 1064nm laser.When pump power was 80W, Output of laser power was 33W, and the beam quality that measures after outgoing mirror 3 is M
x 2=2.8, M
y 2=2.7.Fig. 3 is the far-field intensity distribution figure of oscillator stage output beam.
The stage gain medium also adopts the Nd:YVO of both-end pumping
4Crystal, crystal are the a-cut cutting, and doping content is 0.3%, Nd:YVO
4Laser crystal is of a size of 3mm * 3mm * 11mm, wherein the two ends bonding the thick not doping YVO of 2mm
4Crystal.Pump light is at Nd:YVO
4The beam diameter of laser crystal end face is 0.8mm.
The thermal focal length of measuring the stage gain medium is 75mm, adjusts the stage gain medium to the distance of outgoing mirror, makes L3=75mm.Experiment measuring through power and the beam quality of light beam after amplifying stage.When the amplifying stage pump power was 85W, the power stage that finally is amplified rear light beam was 65W, and beam quality factor is M
x 2=1.7, M
y 2=1.6, the curve of measuring beam quality factor such as Fig. 4.Fig. 5 is the far-field intensity distribution figure through output beam after amplifying stage.Experiment shows, raising can be in the situation that output beam has higher-wattage by the device of laser amplifier beam quality, obtain good beam quality, overcome laser amplifier system beam quality in the past can be along with the increase of power output the phenomenon of severe exacerbation.
Above-described embodiment is used for the present invention that explains, rather than limits the invention, and in the protection range of spirit of the present invention and claim, any modification and change to the present invention makes all fall into protection scope of the present invention.
Claims (7)
1. laser amplifier that improves beam quality, comprise oscillator stage and amplifying stage, described oscillator stage comprises total reflective mirror, the first gain medium and the outgoing mirror that sets gradually, it is characterized in that, distance between described total reflective mirror and the first gain medium is L1, the distance of the first gain medium and outgoing mirror is L2, and L1＞L2;
The distance of described amplifying stage and outgoing mirror is L3, and L3 equals the thermal focal length of amplifying stage.
2. the laser amplifier of raising beam quality according to claim 1, is characterized in that, greater than 95%, described outgoing mirror is 1%～98% to the reflectivity of laser beam to described total reflective mirror to the reflectivity of laser beam.
3. the laser amplifier of raising beam quality according to claim 1, is characterized in that, L1 is 3～5 times of L2.
4. the laser amplifier of raising beam quality according to claim 1, is characterized in that, described the first gain medium is Nd:YAG crystal, Nd:YVO
4Crystal or Yb:YAG crystal.
5. the laser amplifier of raising beam quality according to claim 1, is characterized in that, described amplifying stage comprises the second gain medium, and described the second gain medium is Nd:YAG crystal, Nd:YVO
4Crystal or Yb:YAG crystal.
6. the laser amplifier of raising beam quality according to claim 5, is characterized in that, the thermal focal length of described the second gain medium is 10mm-2000mm.
7. method based on the raising beam quality of laser amplifier, described laser amplifier comprises oscillator stage and amplifying stage, described oscillator stage comprises total reflective mirror, the first gain medium and the outgoing mirror that sets gradually; Distance in described oscillator stage between total reflective mirror and the first gain medium is L1, and the distance between the first gain medium and outgoing mirror is L2, and L1＞L2;
It is characterized in that, described method comprises:
1) according to the thermal focal length of the operating point determination amplifying stage of amplifying stage;
2) adjust the position of amplifying stage, make the distance L 3 of amplifying stage and outgoing mirror equal the thermal focal length of amplifying stage;
3) emergent ray of outgoing mirror is exported as laser beam by after amplifying stage.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807363A (en) * | 2017-12-13 | 2018-03-16 | 中国科学院上海天文台 | The laser echo signal signal to noise ratio intensifier and Enhancement Method of a kind of laser ranging |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990016100A1 (en) * | 1989-06-16 | 1990-12-27 | Leningradsky Gosudarstvenny Universitet | Method for obtaining laser generation and a laser therefor |
| JP2006156677A (en) * | 2004-11-29 | 2006-06-15 | Laserfront Technologies Inc | Solid state laser oscillator |
| CN101071930A (en) * | 2007-05-24 | 2007-11-14 | 浙江大学 | Two-rod fundamental mode dynamic stable asymmetric laser resonant cavity and its designing method |
| JP2009099951A (en) * | 2007-09-28 | 2009-05-07 | Fujifilm Corp | Mode-locked solid-state laser apparatus |
| CN101527423A (en) * | 2009-04-20 | 2009-09-09 | 清华大学 | High-mean-power high-repetition-rate solid laser |
| US20110043899A1 (en) * | 2009-08-20 | 2011-02-24 | Lawrence Livermore National Security, Llc | Spatial filters for high average power lasers |
| CN202495673U (en) * | 2011-11-09 | 2012-10-17 | 董玉芬 | Laser rod thermal lens effect compensation device |
-
2013
- 2013-01-23 CN CN201310026303.6A patent/CN103117505B/en not_active Expired - Fee Related
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1990016100A1 (en) * | 1989-06-16 | 1990-12-27 | Leningradsky Gosudarstvenny Universitet | Method for obtaining laser generation and a laser therefor |
| JP2006156677A (en) * | 2004-11-29 | 2006-06-15 | Laserfront Technologies Inc | Solid state laser oscillator |
| CN101071930A (en) * | 2007-05-24 | 2007-11-14 | 浙江大学 | Two-rod fundamental mode dynamic stable asymmetric laser resonant cavity and its designing method |
| JP2009099951A (en) * | 2007-09-28 | 2009-05-07 | Fujifilm Corp | Mode-locked solid-state laser apparatus |
| CN101527423A (en) * | 2009-04-20 | 2009-09-09 | 清华大学 | High-mean-power high-repetition-rate solid laser |
| US20110043899A1 (en) * | 2009-08-20 | 2011-02-24 | Lawrence Livermore National Security, Llc | Spatial filters for high average power lasers |
| CN202495673U (en) * | 2011-11-09 | 2012-10-17 | 董玉芬 | Laser rod thermal lens effect compensation device |
Non-Patent Citations (4)
| Title |
|---|
| CHONG LIU ,ET AL: "Asymmetric TEM00-Mode Cavity for Birefringence-Compensated Two-Rod Solid-State Lasers", 《IEEE JOURNAL OF QUANTUM ELECTRONICS》 * |
| V BAGNOUD, F SALIN: "Amplifying laser pulses to the terawatt level at a 1-kilohertz repetition rate", 《APPLIED PHYSICS B》 * |
| 刘崇， 葛剑虹， 项震， 陈军: "双棒串接补偿热致双折射效应激光谐振腔", 《中国激光》 * |
| 贺万骏， 姚宝权， 王月珠， 鞠有伦: "二极管端面抽运的固体激光放大器自身热透镜焦距测量", 《物理学报》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107807363A (en) * | 2017-12-13 | 2018-03-16 | 中国科学院上海天文台 | The laser echo signal signal to noise ratio intensifier and Enhancement Method of a kind of laser ranging |
| CN107807363B (en) * | 2017-12-13 | 2021-01-01 | 中国科学院上海天文台 | Laser echo signal-to-noise ratio enhancing device and enhancing method for laser ranging |
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