CN102570281A - Amplifier and method for increasing multipass amplifying output power of bar-like Nd: YAG (yttrium aluminum garnet) laser - Google Patents
Amplifier and method for increasing multipass amplifying output power of bar-like Nd: YAG (yttrium aluminum garnet) laser Download PDFInfo
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- CN102570281A CN102570281A CN2012100065007A CN201210006500A CN102570281A CN 102570281 A CN102570281 A CN 102570281A CN 2012100065007 A CN2012100065007 A CN 2012100065007A CN 201210006500 A CN201210006500 A CN 201210006500A CN 102570281 A CN102570281 A CN 102570281A
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Abstract
The invention relates to an amplifier and a method for increasing multipass amplifying output power of bar-like Nd: YAG (yttrium aluminum garnet) laser, belonging to the technical field of a laser device. A 1/2 wave plate, a polarized beam splitter a, a 45-degree faraday rotator, a 45-degree quartz rotator and a polarized beam splitter b are placed in sequence to form an opto-isolator, and a laser medium is installed in a semiconductor laser module. After seed light is injected, the seed light enters into the laser medium through the opto-isolator. The laser medium is an Nd: YAG crystal bar in a [100] cutting direction. After output, one-pass amplification is realized. The one-pass amplifying laser passes through a 1/4 wave plate and a total-reflecting mirror and then enters into the laser medium again, and two-pass amplifying laser is output through the polarized beam splitter b. When the laser enters into the laser medium, a direction in which the output power of linearly polarized light is a maximum value is selected as the direction of the crystal bar in the rotation range of 360 degrees. According to the amplifier and the method, the heat depolarization effect is obviously reduced, and additional loss brought by inserting a heat depolarization compensation device is avoided.
Description
Technical field
The present invention relates to the how logical laser amplifier of a kind of use [100] direction cutting Nd:YAG crystal bar, seek the method for maximum linearly polarized light power output, belong to the laser technique field through rotating the Nd:YAG crystal bar.
Background technology
Along with the development of laser amplifier, in order to realize high-output power, must adopt many logical structure for amplifying, laser must be linearly polarized light.Along with the increase through the laser medium number of times of pump power and laser, the hot fevering sodium effect that is caused by thermally induced birefringence will obviously increase, and have a strong impact on the power output of solid state laser.In order to reduce hot fevering sodium effect to laser amplifier and seed source laser Effect on Performance, mainly take optical isolator at present, make and move back polarisation and can't get back to seed source laser, but this method can't reduce the hot fevering sodium effect of laser amplifier.
Bar-shaped Nd:YAG laser multi-pass amplifier uses [111] direction cutting Nd:YAG crystal bar as gain media in the middle of the prior art, and in many logical amplification process, its hot depolarization loss is bigger.
Summary of the invention
The objective of the invention is to overcome common bar-shaped Nd:YAG laser amplifier heat and move back inclined to one side influence, propose a kind of device and method that improves bar-shaped Nd:YAG laser multi-pass amplifier power output power output.Key of the present invention is to use the gain media of [100] direction cutting Nd:YAG crystal bar as laser amplifier, and combines optical isolator, and research is to the value of laser amplifier practical application.Just can find heat to move back the direction of inclined to one side minimum through rotation Nd:YAG crystal bar; Can obtain maximum linearly polarized light power output; Than single passive use optical isolator, the Nd:YAG crystal bar of [100] direction cutting is as the gain media of laser amplifier, and the combination optical isolator; Promptly can effectively improve the power output of bar-shaped Nd:YAG laser amplifier, can prevent unavoidable influence of moving back polarisation again seed source laser.
A kind of amplifier that bar-shaped Nd:YAG laser bilateral is amplified power output that improves of the present invention; It is characterized in that, place the formation optical isolator by 1/2 wave plate (1), polarization splitting prism a (2), 45 degree Faraday rotators (3), 45 degree quartzy circulators (4) and polarization splitting prism b (5) order; Laser medium (6) is installed in the diode-end-pumped module (7); Laser medium (6) is to use the Nd:YAG crystal bar of [100] cut direction; Semiconductor laser is placed on after the optical isolator; Quarter wave plate (8) places after the pump module, and total reflective mirror (9) is positioned over quarter wave plate (8) afterwards, constitutes Nd:YAG laser bilateral amplifier.
Utilize above-mentioned bar-shaped Nd:YAG laser bilateral amplifier to improve the method that bar-shaped Nd:YAG laser bilateral is amplified power output, it is characterized in that, may further comprise the steps:
After seed light (10) is injected, get into laser medium (6) through optical isolator, logical an amplification realized in the output back; One logical amplifying laser gets into laser medium (6) after through quarter wave plate (8) and total reflective mirror (9) once more, exports two from polarization splitting prism b (5) and leads to amplifying lasers (11).
When linearly polarized light got into laser medium (6), in the rotation adjusting scope of 360 degree, there was the period of change of four linearly polarized light power outputs in rotary laser medium (6), and four linearly polarized light power output maximum are arranged respectively; Choose the direction of the direction of wherein any linearly polarized light power output maximum, can make the heat of laser move back inclined to one side minimum, realize the raising of bar-shaped Nd:YAG laser bilateral amplifier power output as crystal bar.
It is the key factor that influences linearly polarized light power output size partially that the heat of laser is moved back, and heat is moved back partially more little, and the linearly polarized light power output is big more.Lead to amplification owing to realize Nd:YAG laser more; Seed light also must be a linearly polarized light; Use the Nd:YAG crystal bar of [100] cut direction to be used for multi-pass amplifier, can realize the raising of bar-shaped Nd:YAG laser multi-pass amplifier linear polarization power output equally as laser medium.
The present invention has realized the raising of bar-shaped Nd:YAG laser multi-pass amplifier power output with new way, and moving back inclined to one side method than tradition compensation heat has following advantage:
(1) hot fevering sodium effect obviously reduces;
(2) avoid inserting compensation heat and moved back the inclined to one side excess loss that device brought;
(3) greatly reduce the laser cost;
(4) operation is more simple, is easy to realize practical applications.
The present invention has substantial characteristics and marked improvement, and method of the present invention can be widely used in can obviously improving efficient, stability and the power output of laser in the bar-shaped Nd:YAG laser multi-pass amplifier.
Description of drawings
Fig. 1 is a system schematic of the present invention;
Fig. 2 is a polarisation Amici prism work sketch map;
Fig. 3 is perpendicular to the graph of a relation at θ angle and
angle in [111] the direction Nd:YAG rod cross section;
Fig. 4 is perpendicular to the graph of a relation at θ angle and
angle in [100] the direction Nd:YAG rod cross section;
Fig. 5 is to use any direction of rotation [111] cut direction Nd:YAG rod, [100] cut direction Nd:YAG rod as laser medium, and the laser single-pass amplifies the theory relation figure that little and pump power bigger than normal are moved back in after heat.
Embodiment
As shown in Figure 1, present embodiment is to be placed by 1/2 wave plate (1), polarization splitting prism a (2), 45 degree Faraday rotators (3), 45 degree quartzy circulators (4) and polarization splitting prism b (5) order to constitute optical isolator.Laser medium (6) is installed in the semiconductor laser module (7); Laser medium (6) is to use the Nd:YAG crystal bar of [100] cut direction, after seed light (10) is injected, gets into laser medium (6) through optical isolator; Add that quarter wave plate (8) and total reflective mirror (9) constitute laser bilateral amplifier; Below in conjunction with the thermal stress birefringence effect of [111] and [100] direction cutting Nd:YAG crystal, and the hot fevering sodium effect that is produced, present embodiment is further specified.
Seed light (10) is the p linearly polarized laser, revolves through 1/2 wave plate (1) back phase place to turn 90 degrees the linearly polarized laser into s, through still being the s linearly polarized laser behind the polarization splitting prism a (2); Spending quartzy circulator (4) phase places through 45 degree Faraday rotators (3) and 45 revolves and turn 90 degrees the linearly polarized laser into p; Through still being the p linearly polarized laser behind the polarization splitting prism b (5), get into laser medium (6), through quarter wave plate (8) after total reflective mirror (9) reflection; Once more through quarter wave plate (8); Phase place is revolved and is turn 90 degrees the linearly polarized laser into s, once more through laser medium (6), from two logical amplifying lasers of polarization splitting prism b (5) output s linear polarization.Polarization splitting prism s linearly polarized laser and p linearly polarized laser sketch map are as shown in Figure 2.For [100] direction cutting Nd:YAG crystal, heat is moved back folk prescription to existing certain relation, rotating crystal direction just can find heat to move back the direction of inclined to one side minimum with the crystal-cut orientation, and the heat on this direction is moved back the heat in [111] direction Nd:YAG rod less than normal and moved back partially.
Operation principle is following: the refractive index of operation material can be used up the rate body surface and shown that the minor variations of its shape, size and direction can characterize with the variations in refractive index that strain causes, i.e. index ellipsoid.[111] and [100] direction cutting Nd:YAG have cubic crystal structure, thereby optical isotropy, its indicatrix is a ball, but under the effect of thermal stress, becomes ellipsoid.In bar-shaped Nd:YAG crystal, laterally thermal stress is radially and tangential distribution, with local indicatrix identical direction axially arranged.I.e. every bit in excellent cross section, the main shaft of thermally induced birefringence all is radially and tangential distribution, square being directly proportional of birefringence size and radius.Therefore, the very big polarization that moves back can appear in the linearly polarized light beam through the Nd:YAG rod.In the plane of vertical bars axle a bit
The radial refractive index component of this point is n
r, n
rBecome with the y axle
Angle and perpendicular to the tangential refractive index component
That supposes incident light a bit resolves into two components, is parallel to n respectively
rWith
Because
So between two components, have phase difference, elliptical polarization will take place in light.
As shown in Figure 3; Nd:YAG crystal for [111] cut direction; The x axle in the rod cross section angle theta with the characteristic vector of one of birefringence direction respectively is identical with angle
size of moving back the polarization direction; Be that lattice structure is axially symmetrical along rod;
its size is irrelevant with bullet light tensor size, and the direction that changes linear polarization can not change heat and move back inclined to one side size.But Nd:YAG crystal for [100] cut direction; As shown in Figure 4; These two angles are unequal; Promptly
its size is relevant with bullet light tensor size, moves back inclined to one side size so the direction of rotating crystal rod will change heat.
The heat of two laser bars of theoretical contrast identical parameters is moved back bigger than normal little, and identical parameters refers to: the doping content of [100] and [111] cut direction Nd:YAG rod is identical 1.1%, identical, the excellent long 80mm of excellent diameter 3mm is identical, pump cavity is identical.Use any direction of rotation [111] cut direction Nd:YAG rod, [100] cut direction Nd:YAG rod as laser medium, the laser single-pass amplifies after heat and moves back bigger than normal little as shown in Figure 5 with relational theory figure pump power.When use minimum thermal move back folk prescription to [100] cut direction Nd:YAG rod as the laser medium of laser amplifier, hot fevering sodium effect obviously reduces.
Claims (3)
1. one kind is improved the amplifier that bar-shaped Nd:YAG laser bilateral is amplified power output; It is characterized in that, place the formation optical isolator by 1/2 wave plate (1), polarization splitting prism a (2), 45 degree Faraday rotators (3), 45 degree quartzy circulators (4) and polarization splitting prism b (5) order; Laser medium (6) is installed in the diode-end-pumped module (7); Laser medium (6) is to use the Nd:YAG crystal bar of [100] cut direction; Semiconductor laser is placed on after the optical isolator; Quarter wave plate (8) places after the pump module, and total reflective mirror (9) is positioned over quarter wave plate (8) afterwards, constitutes Nd:YAG laser bilateral amplifier.
2. utilize the described Nd:YAG laser of claim 1 bilateral amplifier to improve the method that bar-shaped Nd:YAG laser bilateral is amplified power output; It is characterized in that; May further comprise the steps: after seed light (10) is injected, get into laser medium (6) through optical isolator, logical an amplification realized in the output back; One logical amplifying laser gets into laser medium (6) after through quarter wave plate (8) and total reflective mirror (9) once more, exports two from polarization splitting prism b (5) and leads to amplifying lasers (11); When laser gets into laser medium (6); Rotary laser medium (6); In the rotation adjusting scope of 360 degree, there is the period of change of four linearly polarized light power outputs, choose the direction of the direction of wherein any linearly polarized light power output maximum as crystal bar; Make the heat of laser move back inclined to one side minimum, realize the raising of bar-shaped Nd:YAG laser bilateral amplifier power output.
3. the bar-shaped Nd:YAG laser of raising leads to the amplifier that amplifies power output more, it is characterized in that, uses the Nd:YAG crystal bar of [100] cut direction to be used for multi-pass amplifier as laser medium.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348073A (en) * | 2013-08-09 | 2015-02-11 | 中国科学院物理研究所 | Tunable narrow-linewidth DUV (Deep Ultra Violet) laser |
| CN105140773A (en) * | 2014-05-30 | 2015-12-09 | 李激光公司 | External diffusion amplifier |
| CN106451054A (en) * | 2016-11-29 | 2017-02-22 | 中国工程物理研究院激光聚变研究中心 | Thermal depolarization complete compensation device in multi-pass laser amplifier and use method of device |
| CN107482432A (en) * | 2017-08-16 | 2017-12-15 | 中国科学院上海光学精密机械研究所 | Annular multi-pass laser amplification device |
| CN108923231A (en) * | 2018-07-30 | 2018-11-30 | 中国工程物理研究院应用电子学研究所 | A kind of direct liquid cooling distributed gain laser based on polarization bilateral side pump |
| 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 |
| CN110161516A (en) * | 2019-05-21 | 2019-08-23 | 深圳市速腾聚创科技有限公司 | Laser radar range device and laser scanning control method |
| CN112799185A (en) * | 2021-04-14 | 2021-05-14 | 武汉恩达通科技有限公司 | Four-port circulator for single-fiber bidirectional communication and optical module |
| CN112930470A (en) * | 2018-09-04 | 2021-06-08 | 省卫生服务局 | Image guided micro-raman spectroscopy |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104348073A (en) * | 2013-08-09 | 2015-02-11 | 中国科学院物理研究所 | Tunable narrow-linewidth DUV (Deep Ultra Violet) laser |
| CN105140773A (en) * | 2014-05-30 | 2015-12-09 | 李激光公司 | External diffusion amplifier |
| CN106451054A (en) * | 2016-11-29 | 2017-02-22 | 中国工程物理研究院激光聚变研究中心 | Thermal depolarization complete compensation device in multi-pass laser amplifier and use method of device |
| CN106451054B (en) * | 2016-11-29 | 2023-07-21 | 中国工程物理研究院激光聚变研究中心 | Thermal depolarization complete compensation device of multi-pass laser amplifier and application method thereof |
| CN107482432A (en) * | 2017-08-16 | 2017-12-15 | 中国科学院上海光学精密机械研究所 | Annular multi-pass laser amplification device |
| CN108923231A (en) * | 2018-07-30 | 2018-11-30 | 中国工程物理研究院应用电子学研究所 | A kind of direct liquid cooling distributed gain laser based on polarization bilateral side pump |
| CN112930470A (en) * | 2018-09-04 | 2021-06-08 | 省卫生服务局 | Image guided micro-raman spectroscopy |
| 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 |
| CN110161516A (en) * | 2019-05-21 | 2019-08-23 | 深圳市速腾聚创科技有限公司 | Laser radar range device and laser scanning control method |
| CN110161516B (en) * | 2019-05-21 | 2021-04-02 | 深圳市速腾聚创科技有限公司 | Laser radar ranging device and laser scanning control method |
| CN112799185A (en) * | 2021-04-14 | 2021-05-14 | 武汉恩达通科技有限公司 | Four-port circulator for single-fiber bidirectional communication and optical module |
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Application publication date: 20120711 |