CN100470968C - Pulse laser for improving the output beam quality - Google Patents
Pulse laser for improving the output beam quality Download PDFInfo
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- CN100470968C CN100470968C CNB2007100803876A CN200710080387A CN100470968C CN 100470968 C CN100470968 C CN 100470968C CN B2007100803876 A CNB2007100803876 A CN B2007100803876A CN 200710080387 A CN200710080387 A CN 200710080387A CN 100470968 C CN100470968 C CN 100470968C
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- saturable absorption
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Abstract
The invention is a pulse laser for improving output light beam quality, belonging to the field of laser technique, and characterized in that it comprises pumping source, laser gain medium, saturable absorbing device, and mirror, and it changes the radial losses of the saturable absorbing device to be able to effectively prohibit high-order transverse mode and obtain laser output of high light beam quality. Concretely, this can be implemented by changing the radial absorption factor of the saturable absorber or by coating variable-reflectivity film on the light transmitting surface of the saturable absorbing device, etc. and the invention has advantages of: simple and effective, and stable and reliable to operate, and solves the problem that the traditional techniques increase system complexity and reduce system stability.
Description
Technical field
The present invention relates to a kind of laser, particularly a kind of pulse laser of high light beam quality belongs to the laser technique field.
Background technology
Pulse laser has been brought into play important effect in fields such as industrial processes, message transmission, remote sensings.At present, generally adopt Q-regulating technique to obtain high-peak power and very short laser pulse of duration.In a lot of industry and Military Application, require laser output beam to have higher beam quality.Generally adopt measures such as diaphragm modeling, special stable cavity or unsteady cavity at present, and these measures or reduction efficiency of laser perhaps increase the resonant cavity complexity, perhaps reduce the stability of a system.And passive Q-regulaitng laser is under same laser works parameter, and its output beam quality is better than initiatively Q-switched laser, and this mainly has benefited from the dynamic diaphragm characteristic of saturable absorption device.
To improving the effect of laser output beam quality, in the works of a lot of optics specialties, argumentation (as: Lan Xinju, laser technology, Science Press, second edition, 2005,125 pages) is all arranged about the dynamic diaphragm characteristic of saturable absorption device.As far back as nineteen sixty-five, the model selection characteristic that W.R.Sooy has just analyzed the saturable absorption device in theory (sees W.R.Sooy for details, The natural selection of modes in a passive q-switched laser, Applied Physics Letters, v 7, p36-37).2002, the transverse mode selection when people such as Zheng Quan have reported Cr:YAG as passive Q-adjusted element and the effect of longitudinal mode selection (saw Zheng Quan for details, Chen Yingxin, Zhao Ling, millipede gives birth to, the modeling effect when saturable absorption material C r:YAG makees passive Q-adjusted element, the photon journal, the 31st volume, 550-552 page or leaf).2006, when people such as Junewen Chen have reported various saturable absorption materials and have used as slow Q switching, the transverse mode selection characteristic that is showed (sees Junewen Chen for details, Jun-Ting Linand Ou-Yang Mang, Smaller output beam divergence in the slowly opened Q-switch operation, Optical Review, v13, p69-76).
In addition, adopt variable reflectivity mirror also to have the effect that improves output beam quality as output coupling mirror, about this point argumentation (as: W. Ke Xinaier work is arranged also in the works of a lot of optics specialties, Sun Wen, Jiang Zewen, Cheng Guoxiang translate, the Solid State Laser engineering, Science Press, 2002,243 pages).
In order further to improve the transverse mode selectivity characteristic of passive Q-regulaitng laser, the present invention proposes a kind of pulse laser that is used to improve output beam quality.
Summary of the invention
The purpose of this invention is to provide a kind of pulse laser apparatus that is used to improve output beam quality, this laser has the output beam quality height, and is simple in structure, and working stability is reliable, practical advantage.
The invention is characterized in: a kind of pulse laser that is used to improve output beam quality, contain: pumping source, gain medium, saturable absorption device, chamber mirror, described chamber mirror comprise an Effect of Back-Cavity Mirror and an outgoing mirror at least; Effect of Back-Cavity Mirror is to the high reflection of laser; The emission spectra of pumping source and the absorption spectra of gain medium coupling; Gain medium is to produce laser output, and described saturable absorption device has the solid laser working substance of saturable absorption characteristic to the emission wavelength of this gain medium; The pump light that pumping source sends can be direct, or by incident laser gain media behind the coupling device, the logical light face of this saturable absorption device is processed into concave surface or convex surface, and perhaps the doping content of saturable absorption ion radially changes, its center doping content is low, edge doping content height; The plated film of outgoing mirror is set the transmitance of optical maser wavelength.
Described Effect of Back-Cavity Mirror can be plated in gain medium on the end face of pumping source with the form of optical medium film, anti-reflection to pump light, the pump light that pumping source is launched can be coupled by optical fiber, incide after the lens focus on the gain medium, the plated film of this gain medium on the logical light face of output is anti-reflection to optical maser wavelength.
Described outgoing mirror can be the optical thin film that a kind of reflectivity that is plated on the logical light face of saturable absorption device radially changes.
The optical thin film that the plating reflectivity radially changes on the logical light face of described saturable absorption device.
Described pumping source is the various pumping sources that comprise semiconductor laser, photoflash lamp, and pump mode is the various pump modes that comprise end pumping, profile pump.
Described laser adopts the various cavity structures that comprise straight chamber, folding chamber, annular chamber.
Described gain medium can be combined into a kind of complex media with the saturable absorption device.
In described gain medium, can mix laser gain element and saturable absorption element simultaneously, constitute the laser medium that self-saturation absorbs.
Described Effect of Back-Cavity Mirror can be discrete Effect of Back-Cavity Mirror.
The present invention compared with prior art, have the following advantages and the high-lighting effect: the present invention proposes pass through change saturable absorption device absorption factor radially, perhaps modes such as plating reflectivity-variable film on the logical light face of saturable absorption device, improve the method for output beam quality, have simple effective, stable and reliable operation advantage, solved conventional art and brought the problem that system complexity increases and stability reduces.
Description of drawings
Fig. 1 is the structural representation that is used to improve first embodiment of pulse laser of output beam quality provided by the invention.
Fig. 2 is the structural representation that is used to improve second embodiment of pulse laser of output beam quality provided by the invention.
Fig. 3 is the structural representation that is used to improve the 3rd embodiment of pulse laser of output beam quality provided by the invention.
Fig. 4 is the structural representation that is used to improve the 4th embodiment of pulse laser of output beam quality provided by the invention.
Fig. 5 is the structural representation that is used to improve the 5th embodiment of pulse laser of output beam quality provided by the invention.
Among Fig. 1～Fig. 5,1-semiconductor laser, 2-coupled fiber, 3-coupled lens, 4-be plated in Effect of Back-Cavity Mirror on the gain media with the optical medium form membrane, 5-gain medium, 6-logical light face is processed into the saturable absorption device of concave surface, 7-outgoing mirror, the saturable absorption device that 8-saturable absorption element doping concentration radially changes, 9-being plated in outgoing mirror on the saturable absorption device with the reflectivity-variable form membrane, 10-logical light face is processed into the laser medium that the self-saturation of concave surface absorbs
Embodiment
Fig. 1 is first embodiment that is used to improve the pulse laser of output beam quality provided by the invention.Thought of the present invention can be applied to the laser of various chambeies type, as straight chamber, folding chamber, annular chamber etc., can adopt various pumping sources and various pump modes such as semiconductor laser, photoflash lamp.Here select for use straight chamber and semiconductor laser end pumping mode just as a convenient embodiment who illustrates of the present invention.
Logical light face with saturable absorption device 6 among first embodiment is processed into concave surface, and two logical light end face plating is to the anti-reflection film of optical maser wavelength.The pump light that semiconductor laser 1 is launched focuses on back incident laser gain media 5 by optical fiber 2 couplings and lens 3.The absorption spectra coupling of the emission spectra of semiconductor laser 1 and gain media 5.4 pairs of pump lights of Effect of Back-Cavity Mirror are anti-reflection, and are high anti-to laser.Effect of Back-Cavity Mirror 4 is plated in gain media 5 on the end face of pumping with the form of optical medium film in this embodiment, can certainly adopt discrete Effect of Back-Cavity Mirror.Gain medium 5 is for producing output and the solid-state laser operation material that saturable absorption device 6 has the saturable absorption characteristic to its emission wavelength of laser, as Nd:YAG, Yb:YAG, Nd:YVO
4, Nd:glass etc.The plated film of gain medium 5 on the logical light face of output is anti-reflection to optical maser wavelength.The plated film of front cavity mirror 7 has certain transmitance to optical maser wavelength.
In first embodiment, saturable absorption device 6 itself has dynamic diaphragm characteristic, mainly be because the vibration light beam has maximum intensity near central axis, thereby bleach near the position of saturable absorption device 6 axis centre reaches at first, to from axis position far away then because of its incident optical power density is low, be difficult for bleaching, thereby loss is bigger, cause the high-order transverse mode to be difficult for forming vibration, thereby improved output beam quality.By saturable absorption device 6 logical light faces are processed into concave surface or convex surface, make that the edge absorbs strong a little less than its center absorption.Because the pattern radius of high-order transverse mode is generally big than fundamental transverse mode, makes that the absorptance fundamental transverse mode of high-order transverse mode is strong.Thereby the high-order transverse mode more is difficult for starting of oscillation, further strengthened the dynamic diaphragm characteristic of saturable absorption device 6, thereby further improved output beam quality.
Fig. 2 is second embodiment that is used to improve the pulse laser of output beam quality provided by the invention, wherein, the doping content of saturable absorption element radially changes in saturable absorption device 8, and it plates reflectivity-variable film 9 as outgoing mirror on the logical light face of output simultaneously.It is high that the doping content of saturable absorption element is set to the center doping, and the edge mixes low.Reflectivity-variable film 9 is the variable optical thin film of a kind of radially reflectivity, is generally foveal reflex rate height, and the edge is low.The pattern radius of considering the high-order transverse mode is generally big than fundamental transverse mode, makes the round trip loss ratio fundamental transverse mode height of high-order transverse mode.Thereby the high-order transverse mode is difficult for starting of oscillation, thereby improves the output high light beam quality.
Fig. 3 is the 3rd embodiment that is used to improve the pulse laser of output beam quality provided by the invention, it is characterized in that, the end face of saturable absorption device 6 is processed into concave surface, and plates reflectivity-variable film 9 as outgoing mirror on the surface of output at the saturable absorption device.Thereby the modeling effect of saturable absorption device is further enhanced, thereby improves the output high light beam quality.
Fig. 4 is the 4th embodiment that is used to improve the pulse laser of output beam quality provided by the invention, it is characterized in that, gain medium 5 and saturable absorption device 6 are combined into a kind of complex media, and its enforcement principle and the first embodiment of the present invention are basic identical.
Fig. 5 is the 5th embodiment that is used to improve the pulse laser of output beam quality provided by the invention, it is characterized in that, in gain medium, mix laser gain element and saturable absorption element simultaneously, constitute the laser medium 10 that self-saturation absorbs, its enforcement principle and the first embodiment of the present invention are basic identical.
Claims (9)
1. be used to improve the pulse laser of output beam quality, it is characterized in that, at least contain: pumping source (1), gain medium (5), saturable absorption device (6,8), chamber mirror (4,7,9), described chamber mirror comprise an Effect of Back-Cavity Mirror (4) and an outgoing mirror (7,9) at least; Effect of Back-Cavity Mirror (4) is to the high reflection of laser; The absorption spectra coupling of the emission spectra of pumping source (1) and gain medium (5); Gain medium (5) is to produce laser output, and described saturable absorption device (6,8) solid laser working substance that the emission wavelength of this gain medium (5) is had the saturable absorption characteristic; The pump light that pumping source (1) sends is direct, or by coupling device (2,3) back incident laser gain media (5), the logical light face of this saturable absorption device (6,8) is processed into concave surface or convex surface, perhaps the doping content of saturable absorption ion radially changes, its center doping content is low, edge doping content height; Outgoing mirror (7,9) is set the transmitance of optical maser wavelength.
2. the pulse laser that is used to improve output beam quality according to claim 1, it is characterized in that, described Effect of Back-Cavity Mirror (4) is plated in gain medium (5) on the end face of pumping source (1) with the form of optical medium film, anti-reflection to pump light, the pump light that pumping source (1) is launched is by optical fiber (2) coupling, lens (3) incide on the gain medium (5) after focusing on, and the plated film of this gain medium (5) on the logical light face of output is anti-reflection to optical maser wavelength.
3. the pulse laser that is used to improve output beam quality according to claim 1, it is characterized in that, described outgoing mirror (7,9) is the optical thin film (9) that a kind of reflectivity that is plated on the logical light face of saturable absorption device (6,8) radially changes, its foveal reflex rate height, the edge reflections rate is low.
4. the pulse laser that is used to improve output beam quality according to claim 1, it is characterized in that, the optical thin film (9) that the plating reflectivity radially changes on the logical light face of described saturable absorption device (6,8), its foveal reflex rate height, the edge reflections rate is low.
5. the pulse laser that is used to improve output beam quality according to claim 1 is characterized in that, described pumping source (1) is laser or photoflash lamp, and pump mode is a kind of in end pumping, the profile pump.
6. the pulse laser that is used to improve output beam quality according to claim 1 is characterized in that, described laser adopts a kind of in straight chamber, folding chamber, the ring cavity structure.
7. the pulse laser that is used to improve output beam quality according to claim 1 is characterized in that, described gain medium (5) and saturable absorption device (6) are combined into a kind of complex media.
8. the pulse laser that is used to improve output beam quality according to claim 1 is characterized in that, mixes laser gain element and saturable absorption element in described gain medium (5) simultaneously, constitutes the laser medium (10) that self-saturation absorbs.
9. the pulse laser that is used to improve output beam quality according to claim 1 is characterized in that, described Effect of Back-Cavity Mirror (4) is discrete Effect of Back-Cavity Mirror.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100803876A CN100470968C (en) | 2007-02-02 | 2007-03-09 | Pulse laser for improving the output beam quality |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710063503 | 2007-02-02 | ||
| CN200710063503.3 | 2007-02-02 | ||
| CNB2007100803876A CN100470968C (en) | 2007-02-02 | 2007-03-09 | Pulse laser for improving the output beam quality |
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| CN101034787A CN101034787A (en) | 2007-09-12 |
| CN100470968C true CN100470968C (en) | 2009-03-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109962402A (en) * | 2017-12-25 | 2019-07-02 | 中国建筑材料科学研究总院有限公司 | A kind of laser medium and laser |
| CN108075346A (en) * | 2018-01-11 | 2018-05-25 | 苏州紫光伟业激光科技有限公司 | A kind of microlaser of ultrashort pulse high-peak power |
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2007
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Non-Patent Citations (4)
| Title |
|---|
| 激光二极管抽运的GaAs被动Q开关Nd:YVO4激光器. 柳强，巩马理，闫平，郭云霄，谢涛，王东生.光学学报，第23卷第3期. 2003 |
| 激光二极管抽运的GaAs被动Q开关Nd:YVO4激光器. 柳强，巩马理，闫平，郭云霄，谢涛，王东生.光学学报，第23卷第3期. 2003 * |
| 被动Q开关材料的研究进展. 段秀兰，袁多荣，许东，吕孟凯，姜雪宁，王新强，宋春风，王增梅.激光与红外，第31卷第5期. 2001 |
| 被动Q开关材料的研究进展. 段秀兰，袁多荣，许东，吕孟凯，姜雪宁，王新强，宋春风，王增梅.激光与红外，第31卷第5期. 2001 * |
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