CN103117505B - 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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- CN103117505B CN103117505B CN201310026303.6A CN201310026303A CN103117505B CN 103117505 B CN103117505 B CN 103117505B CN 201310026303 A CN201310026303 A CN 201310026303A CN 103117505 B CN103117505 B CN 103117505B
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- 239000013078 crystal Substances 0.000 claims description 26
- 238000002310 reflectometry Methods 0.000 claims description 6
- 230000008878 coupling Effects 0.000 description 3
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- 238000005859 coupling reaction Methods 0.000 description 3
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- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
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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 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 that application oscillator stage-amplifier forms is a kind of good method, in this method, can determine its beam characteristics by oscillator stage, 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 between oscillator stage-amplifier, adds beam expanding telescope system to realize two inter-stage beam diameter couplings, as shown in Figure 1, the less light beam of beam radius that oscillator stage is sent, after beam expanding telescope, enter in amplifier and amplify again, can obtain high power output like this.
There are two weak points in such structure, and the one, between oscillator stage-amplifier, need to add beam expanding telescope system, increased the length of light path, make whole system volume ratio huger; The 2nd, the in the situation that of high power pump, because the thermal effect existing in gain media in amplifier can cause the light beam by amplifier gain medium, produce distortion, severe exacerbation the beam quality of Output of laser.
Recently, we find that the beam quality difference of resonant cavity two ends output beam is larger in " a kind of device of the asymmetric laserresonator of basic mode dynamic stability of two-rod series connection " described in patent CN 100495836 C.The distance of definition from laser crystal to resonant cavity mirror is 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 longer one end output beam of brachium, and poor from the beam quality of the shorter one end output beam of brachium.To laser generation level-amplifier system, make oscillator stage from the 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
For thermal effect long due to light path in prior art or gain medium, make by the present situation of beam quality variation after laser amplifier, 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 setting 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, 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 poor, but by adjusting the position of amplifying stage, when the light beam that outgoing mirror is exported enters amplifying stage again after dispersing, will obviously improve beam quality.
For guaranteeing the quality of output beam, as preferably, described total reflective mirror is greater than 95% to the reflectivity of laser beam, and described outgoing mirror is 1%～98% to the reflectivity of laser beam.
Find after deliberation, when the distance of the first gain medium and total reflective mirror is greater than the distance (being L1 > L2) between outgoing mirror and the first gain medium, the outgoing beam of outgoing mirror second-rate, but this light beam enters amplifying stage to be amplified, from the beam quality of amplifying stage output, become better, as preferably, L1 is L2 3～5 times.
As preferably, the first described 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 the second described 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 the second described gain medium is 10mm-2000mm, according to the thermal focal length of this second gain medium, determines the distance between amplifying stage and outgoing mirror, is beneficial to the Laser output that obtains high light beam quality.
The present invention also provides a kind of method that improves beam quality based on above-mentioned laser amplifier, makes to have good beam quality through the light beam of amplifying stage output.
A method for 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 setting 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 after by 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, poor from the beam quality of oscillator stage output, by beam quality after amplifying stage, obtained raising, thereby made the high power laser light output of whole device excellent.
Accompanying drawing explanation
Fig. 1 is that in prior art, light beam enters the spot radius distribution map in amplifying stage after beam expanding telescope system;
Fig. 2 improves in the present invention by device and the index path thereof of laser amplifier beam quality;
Fig. 3 is by the surface of intensity distribution of oscillator stage output beam in embodiment 1;
Fig. 4 measures the curve chart of the beam quality factor of output beam after amplifying stage in embodiment 1;
Fig. 5 be in embodiment 1 after amplifying stage the surface of intensity distribution of output beam.
Embodiment
Embodiment 1
As shown in Figure 2, along optical axis, 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.
Oscillator stage gain media adopts the Nd:YVO of both-end pumping
4crystal, crystal is a-cut cutting, doping content is 0.3%, Nd:YVO
4laser crystal is of a size of 3mm * 3mm * 11mm, wherein two ends bonding the thick not doping YVO of 2mm
4crystal, mainly for the crystal end-face deformation that reduces to cause because of thermal effect.Utilize Lens Coupling system by after the pump light coupling of 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, by regulating Temperature-controlled appliance, be mated to reach with the effective of 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 1064nm high-reflecting film, and the reflectivity of 1064nm laser is greater than to 99.5%, and the reflectivity of outgoing mirror 3 at 1064nm place is 60%.When pump power is 80W, Output of laser power is 33W, and the beam quality measuring 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.
Stage gain medium also adopts the Nd:YVO of both-end pumping
4crystal, crystal is a-cut cutting, doping content is 0.3%, Nd:YVO
4laser crystal is of a size of 3mm * 3mm * 11mm, wherein 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 stage gain medium is 75mm, adjusts stage gain medium to the distance of outgoing mirror, makes L3=75mm.Experiment measuring after amplifying stage power and the beam quality of light beam.When amplifying stage pump power is 85W, the power stage that is finally amplified rear light beam is 65W, and beam quality factor is M
x 2=1.7, M
y 2=1.6, the curve of measuring beam quality factor is as Fig. 4.Fig. 5 is the far-field intensity distribution figure of 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 that the present invention is made, all fall into protection scope of the present invention.
Claims (6)
1. a 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 setting 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 is L2 3～5 times;
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, described total reflective mirror is greater than 95% to the reflectivity of laser beam, and described outgoing mirror is 1%～98% to the reflectivity of laser beam.
3. the laser amplifier of raising beam quality according to claim 1, is characterized in that, the first described gain medium is Nd:YAG crystal, Nd:YVO
4crystal or Yb:YAG crystal.
4. the laser amplifier of raising beam quality according to claim 1, is characterized in that, described amplifying stage comprises the second gain medium, and the second described gain medium is Nd:YAG crystal, Nd:YVO
4crystal or Yb:YAG crystal.
5. the laser amplifier of raising beam quality according to claim 4, is characterized in that, the thermal focal length of the second described gain medium is 10mm-2000mm.
6. a method for 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 setting 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 is L2 3～5 times;
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 after by amplifying stage.
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| CN201310026303.6A CN103117505B (en) | 2013-01-23 | 2013-01-23 | Laser amplifier and method for improving light beam quality |
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| CN103117505B true CN103117505B (en) | 2014-12-17 |
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| 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 |
Citations (6)
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|---|---|---|---|---|
| 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 |
| CN202495673U (en) * | 2011-11-09 | 2012-10-17 | 董玉芬 | Laser rod thermal lens effect compensation device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8320056B2 (en) * | 2009-08-20 | 2012-11-27 | Lawrence Livermore National Security, Llc | Spatial filters for high average power lasers |
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Patent Citations (6)
| 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 |
| CN202495673U (en) * | 2011-11-09 | 2012-10-17 | 董玉芬 | Laser rod thermal lens effect compensation device |
Non-Patent Citations (4)
| Title |
|---|
| Amplifying laser pulses to the terawatt level at a 1-kilohertz repetition rate;V Bagnoud, F Salin;《Applied Physics B》;20000524;第70卷(第7期);165-170 * |
| Chong Liu,et al.Asymmetric TEM00-Mode Cavity for Birefringence-Compensated Two-Rod Solid-State Lasers.《IEEE journal of Quantum Electronics》.2008,第44卷(第11期),1107-1115. * |
| 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》.2007,第34卷(第11期),1483-1487. * |
| 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》.2007,第56卷(第6期),20070630. * |
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