CN1547295A - Dual wavelength combination pumping method for batten-shaped laser gain medium and its gain module - Google Patents
Dual wavelength combination pumping method for batten-shaped laser gain medium and its gain module Download PDFInfo
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- CN1547295A CN1547295A CNA2003101171822A CN200310117182A CN1547295A CN 1547295 A CN1547295 A CN 1547295A CN A2003101171822 A CNA2003101171822 A CN A2003101171822A CN 200310117182 A CN200310117182 A CN 200310117182A CN 1547295 A CN1547295 A CN 1547295A
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Abstract
The invention is a kind of double-wavelength compound pump method of a kind of board laser gain media and the gain model, which belongs to high-power solid laser technology field. The character of the invention lies in: the pump lights with two different wavelengths are coupled from any two pairs of surface in the three pairs of surfaces of the laser gain media into the gain media laser gain media has double imbibition peaks or several imbibition peaks structure, it realizes the high power output of the solid laser. The invention overcomes the restrain that the single pump wavelength can only uses a single pump method, it also upgrades the injected pump power, improves the uniformity of the pump energy distribution, thus, it can acquires high power laser output, improves the beam quality of the output laser. The invention can be used as the gain model of the laser primary grade; it also can be used as the gain model of the laser amplified grade.
Description
Technical field
The present invention relates to a kind of method for pumping and gain module thereof of lath-shaped gain medium, belong to high power solid state laser
Technical field.
Background technology
Gain medium mainly contains geometric configurations such as lath-shaped, bar-shaped and thin disc shaped.The lath-shaped medium more helps obtaining high power output with respect to bar-shaped medium.The laser beam of the slab laser of (Zigzag) light path is inner owing to total reflection forms light path in a zigzag at lath in a zigzag.In a zigzag optical path compensation the optical heterogeneity of lath thickness direction, reduced the influence of thermal lensing effect, and eliminated the birefringence effect that stress causes output laser.
In the high-power strip shape laser gain module of diode pumping, prior art has adopted single pumping wavelength, single pump mode, mainly contains these several single pump modes of upper and lower surface pumping, end pumping and profile pump.In the upper and lower surface pump mode, the pump light that diode array sends is coupled to lath by upper and lower surface.Adopt the patent of this pump mode that 4,127,827,4,852,109,5 of the U.S. is arranged, 271,031,5,305,345,5,646,773 and 5,651,021 etc., because the restriction of the geometry of lath, the absorption light path of upper and lower surface pumping is generally less than several millimeters.This upper and lower surface pump mode only is applicable to the gain medium with high absorption coefficient.At United States Patent (USP) 6,134, in 258, adopted the profile pump mode, carried out pumping, absorbed light path and increase than upper and lower surface pump mode from the Width rather than the thickness direction of lath, but when the gain media absorption coefficient was low, this structure also can't obtain higher absorption efficiency.At United States Patent (USP) 6,094, in 297, a kind of novel end pumping slab laser of light path is in a zigzag disclosed, its absorption light path is long, approximates the length of lath, and pump light is fully absorbed, and pumping efficiency is higher, can reach more than 90%.But this end pumping mode also has its shortcoming: because face area is smaller, limited the input of pump energy, so just made the slab laser that adopts this pump mode expand comparatively difficulty to high power.
Summary of the invention
Adopt many deficiencies of single pumping wavelength, single pump mode at existing lath-shaped gain medium, the invention provides a kind of dual wavelength combination method for pumping and gain module thereof of the gain medium at lath-shaped.
Technical scheme of the present invention is as follows:
A kind of dual wavelength combination method for pumping of lath-shaped gain medium, it is characterized in that: this method for pumping is with the pump light of two kinds of different wave lengths two pairs of inside that gain media is coupled on the surface from three pairs of surfaces of lath-shaped gain medium respectively, the wherein a pair of injection of a kind of pump light of wavelength from three pairs of surfaces of lath, a pair of injection of the pump light of another kind of wavelength from two pairs of surfaces of remainder; Described gain medium adopts the gain medium with biabsorption peak or many absworption peaks structure.
Above-mentioned two kinds of different wave length pumping light wavelengths lay respectively on two different absworption peaks of gain medium absorption spectra.
Described pump light can send by wall scroll, face battle array diode or by the array that they are formed, or is directly coupled to gain medium inside, or is coupled to gain medium inside through optical fiber coupling, optical coupling system.
Technical characterictic of the present invention also is: when adopting end face and side dual wavelength combination pump mode, the end face plating is to output laser with from the anti-reflection film of the pump light of surface feeding sputtering, and the side plating is to the anti-reflection film of the pump light of incident from the side; When adopting end face and upper and lower surface dual wavelength combination pump mode, the end face plating is to output laser with from the anti-reflection film of the pump light of surface feeding sputtering, and the upper and lower surface plating is to the anti-reflection film from the pump light of upper and lower surface incident; When adopting side and upper and lower surface dual wavelength combination pump mode, the side plating is to the anti-reflection film of the pump light of incident from the side, and the upper and lower surface plating is from the anti-reflection film of the pump light of upper and lower surface incident, and the end face plating is to the anti-reflection film of output laser.
The laser gain module of a kind of above-mentioned method for pumping provided by the invention, the gain medium that contains pump light source and lath-shaped, it is characterized in that: the plating of the end face of described gain medium is to output laser with from the anti-reflection film of the pump light of surface feeding sputtering, and the side plating is to the anti-reflection film of the pump light of incident from the side; Or end face plating is to output laser with from the anti-reflection film of the pump light of surface feeding sputtering, and the upper and lower surface plating is to the anti-reflection film from the pump light of upper and lower surface incident; Or end face plating is to output laser anti-reflection film, and the side plating is to the anti-reflection film of the pump light of incident from the side, and the upper and lower surface plating is from the anti-reflection film of the pump light of upper and lower surface incident; Described pump light source is the light source of two kinds of different wave lengths, and its wavelength lays respectively on two different absworption peaks of gain medium absorption spectra.
Laser gain module of the present invention is characterized in that: the gain medium of described lath-shaped is the gain medium with biabsorption peak or many absworption peaks structure.
Lath-shaped of the present invention the end face of gain medium vertical with upper and lower surface or tilt.Can adopt the gain medium of single even doping; Perhaps adopt the gain medium of the compound lath-shaped that thermal bonding technology or growing method obtain, its slat center is the gain medium that mixes, and is non-doped dielectric all around, and non-doped dielectric all around is transparent to pump light.
The present invention compared with prior art, have the following advantages and the high-lighting effect: the dual wavelength combination method for pumping of lath-shaped gain medium provided by the invention is to adopt the different surfaces while pumping laser gain media of the pump light of two kinds of different wave lengths from lath, obtains a kind of novel laser gain module.The pump light that this method for pumping has overcome single wavelength can only adopt the restriction of single pump mode, can also improve the pump power of injection, improve the uniformity that pump energy distributes, thereby help obtaining high power laser light output, improve the beam quality of output laser.Adopt the lath-shaped gain medium of this method for pumping both can also can be used as the gain module of laser amplifying stage as the gain module of laser master-oscillator.
Description of drawings
Fig. 1 a, 1b, 1c represent existing end face, side and upper and lower surface single wavelength pump mode schematic diagram respectively.
Fig. 2 makes up the structural representation of the slab laser of pump mode for adopting end face and side dual wavelength.
Fig. 3 a is the straight-through light path schematic diagram of the lath-shaped gain medium of end face and side dual wavelength combination pumping.
Fig. 3 b is the zigzag light path schematic diagram of the lath-shaped gain medium of end face and side dual wavelength combination pumping.
Fig. 3 c is the zigzag light path schematic diagram of end face and side combination pumping composite slats shape gain medium.
Fig. 4 a is the end face and the side dual wavelength combination pump mode schematic diagram of lath-shaped gain medium.
Fig. 4 b is the end face and the upper and lower surface dual wavelength combination pump mode schematic diagram of lath-shaped gain medium.
Fig. 4 c is the side and the upper and lower surface dual wavelength combination pump mode schematic diagram of lath-shaped gain medium.
Embodiment
The main feature of dual wavelength combination method for pumping is that the pump light of two kinds of different wave lengths is coupled to gain medium inside from end face, side or the upper and lower surface of lath respectively, is fit to be applied to have the gain medium of the absorption spectra structure of biabsorption peak or many absworption peaks.Gain medium is bigger to the absorption coefficient difference of different wave length pump light, gain medium is called the high absorption coefficient pump light to the relatively large pump light of absorption coefficient in two kinds of different wave length pump lights, and the less relatively pump light of absorption coefficient is called low absorption coefficient pump light.The centre wavelength of two kinds of different wave length pump lights lays respectively on two absworption peaks of laser medium absorption spectra.The end face of lath-shaped gain medium or side are as the plane of incidence of low absorption coefficient pump light, low absorption coefficient pump light incides lath gain media inside from end face or side, because total reflection, most of pump light is constrained on the inside of lath gain media, and constantly absorbed, absorbed length or width that light path approximately equals gain media; The high absorption coefficient pump light from the side or upper and lower surface incide lath gain media inside, absorbing light path is the width or the thickness of gain media.For example crystal such as Nd:YAG, Nd:GGG, Nd:ED-2Glass have stronger absworption peak at 808nm and two central wavelength of 885nm respectively, but the absorption coefficient difference is bigger, can adopt wavelength is the side and the end face of the pump light difference pump bar of 808nm and 885nm, or upper and lower surface and side, or upper and lower surface and end face.
In addition, the lath-shaped gain medium can also be made up of compound material.Slat center is the gain medium that mixes, and is to utilize thermal bonding technology or growing method to obtain non-doped dielectric all around, and non-doped dielectric all around is transparent to pump light, pump light is constrained in the slat center part and is absorbed by the dopant material at center.This structure can further improve pump power density, improves the uniformity that pump energy distributes, and also helps the resisting laser damage ability that improves the end face rete.
Further specify principle of the present invention, structure and embodiment below in conjunction with accompanying drawing.
Existing method for pumping at the lath-shaped gain medium is shown in Fig. 1 a, Fig. 1 b and Fig. 1 c.Among each figure, 11 is the lath-shaped gain medium, 13 transmission directions of expression output laser in slab crystal, and pump mode is the method for pumping of single pumping wavelength, single pump mode.The lath-shaped gain medium has three pairs of surfaces facing each other, and a pair of surface shown in 15 among Fig. 1 a is called end face, and a pair of surface shown in 16 is called upper and lower surface, and a pair of surface shown in 17 is called the side.Two end faces can keep vertical with upper and lower surface, also can cut into the form with upper and lower surface angled (for example Brewster's angle).In Fig. 1 a, pump light 12 and 14 injects lath inside from two end faces one of (or two end faces), and the pumping injection direction is parallel with the laser outbound course, and promptly usually said end pumping mode, upper and lower surface can be installed heat sink reinforcement and be dispelled the heat; In Fig. 1 b, pump light is injected in the lath by the side of lath, promptly usually said profile pump mode, the pumping injection direction as show among the figure 18 and 19 shown in (or one of direction wherein, the another side plating pump light film that is all-trans), vertical with the laser outbound course, upper and lower surface also can be installed heat sink; In Fig. 1 c, pump light is injected in the lath by the upper and lower surface of lath, promptly usually said upper and lower surface pump mode, the pumping direction as show among the figure 20 and 21 shown in (or one of direction wherein, another surface plating pump light film that is all-trans), vertical with the laser outbound course.
The method for pumping of dual wavelength combination pumping lath-shaped gain medium provided by the invention can have three kinds of different pump modes: end face and side dual wavelength combination pump mode, end face and upper and lower surface dual wavelength combination pump mode and side and upper and lower surface dual wavelength combination pump mode.Two end faces of lath-shaped gain medium both can cut into and the form of two Surface Vertical up and down, also can cut into and the tilt form of (for example Brewster's angle) of upper and lower surface.The zigzag light path slab laser schematic diagram of employing end face and side dual wavelength combination pump mode as shown in Figure 2.Two of gain medium end faces cut into the form that becomes Brewster's angle with the laser transmission direction among the figure.This laser is made up of the gain medium 25 of laser resonant cavity mirror 22 and 26, lath-shaped, low absorption coefficient pump light 23 and 28 (the 885nm pump lights of for example corresponding Nd:YAG, gain medias such as Nd:GGG, Nd:ED-2Glass), high absorption coefficient pump light 24 and 29 parts such as (the 808nm pump lights of for example corresponding Nd:YAG, gain medias such as Nd:GGG, Nd:ED-2Glass), and the laser outbound course is shown in 27 among the figure.The side plating of lath-shaped gain medium improves the coupling efficiency of pump light to the anti-reflection optical thin film of high absorption coefficient pump light, and the end face plating reduces the loss of lath medium to output laser to the anti-reflection optical thin film of output laser.
In order to reduce the working temperature of gain module, improve the conversion efficiency of energy, increase the output laser power, improve beam quality, can install heat sink in the upper and lower surface of lath, the used heat that gain module is produced in conversion process of energy by heat conduction transfer to heat sink on, by cooling system used heat is taken away again.
The lath-shaped gain medium of dual wavelength combination pumping can adopt different different lath shapes and laser optical path form: the battened construction of the battened construction of the battened construction of the battened construction of even straight-through light path of mixing, even zigzag light path of mixing, the straight-through light path of complex media or the zigzag light path of complex media.Fig. 3 a is depicted as the lath-shaped gain medium of straight-through light path form and the light path schematic diagram of laser output thereof.Fig. 3 b is depicted as the lath-shaped gain medium of zigzag light path form and the light path schematic diagram of output laser thereof.Fig. 3 c is depicted as the composite plate strip gain medium of zigzag light path form and the light path schematic diagram of laser output thereof, 35 is composite plate strip medium (for example Nd:YAG/YAG) among the figure, by doped crystal 36 (as Nd:YAG) and the compound formation of non-doped crystal 37 (as YAG).
The method for pumping of dual wavelength combination pumping lath-shaped gain medium can have three kinds of different pump modes: end face shown in Fig. 4 a and side dual wavelength combination pump mode, end face shown in Fig. 4 b and upper and lower surface dual wavelength combination pump mode, the side shown in Fig. 4 c and upper and lower surface dual wavelength combination pump mode.Among each figure, 11 equal display plate strip gain mediums, its two end faces can cut into and two Surface Vertical up and down, also can cut into the laser transmission direction and become angled form, for example aforesaid Brewster's angle form, lath can also be compound gain media, and 30 all represent the laser outbound course.
The pump light that Fig. 4 a is depicted as two kinds of different wave lengths injects the novel pump mode of lath inside simultaneously by end face and side.Low absorption coefficient pump light is injected by end face, and shown in 31 among figure and 33 directions, the end face plating improves pumping efficiency to low absorption coefficient pump light and the high saturating anti-reflection film of output laser, reduces the loss of laser; The high absorption coefficient pump light is injected by the side, and shown in 32 among figure and 34 directions, two side platings improve pumping efficiency to the high saturating anti-reflection film of high absorption coefficient pump light.
The pump light that Fig. 4 b is depicted as two kinds of different wave lengths injects the novel pump mode of lath inside simultaneously by end face and upper and lower surface.Low absorption coefficient pump light is injected by end face, and shown in 31 among figure and 33 directions, the end face plating improves pumping efficiency to this wavelength pump light and the high saturating anti-reflection film of output laser, reduces the loss of laser; The high absorption coefficient pump light is by two surface injections (also can be injected by a surface, and another surface linking to each other with heat sink as cooling surface) up and down, shown in 38 among figure and 39 directions.
The pump light that Fig. 4 c is depicted as two kinds of different wave lengths injects the novel pump mode of lath inside simultaneously by side and upper and lower surface.Low absorption coefficient pump light is injected by the side, and shown in 32 among figure and 34 directions, two side surface platings improve pumping efficiency to the high saturating anti-reflection film of this wavelength pump light; The high absorption coefficient pump light injects (also can be injected by a surface, and another surface being as cooling surface, with heat sink tight the contact) by upper and lower surface, and shown in 38 among figure and 39 directions, the end face plating is to the anti-reflection film of output laser.
Claims (8)
1. the dual wavelength of lath-shaped gain medium makes up method for pumping, it is characterized in that: this method for pumping is with the pump light of two kinds of different wave lengths two pairs of inside that gain media is coupled on the surface from three pairs of surfaces of lath-shaped gain medium respectively, the wherein a pair of injection of a kind of pump light of wavelength from three pairs of surfaces of lath, a pair of injection of the pump light of another kind of wavelength from two pairs of surfaces of remainder; Described gain medium adopts the gain medium with biabsorption peak or many absworption peaks structure; The pumping light wavelength of described two kinds of different wave lengths lays respectively on two different absworption peaks of gain medium absorption spectra.
2. according to the described dual wavelength combination of claim 1 method for pumping, it is characterized in that: when adopting end face and side dual wavelength combination pump mode, end face is to output laser and anti-reflection from the pump light of surface feeding sputtering, and the side is anti-reflection to the pump light of incident from the side; When adopting end face and upper and lower surface dual wavelength combination pump mode, end face is to output laser and anti-reflection from the pump light of surface feeding sputtering, and upper and lower surface is to anti-reflection from the pump light of upper and lower surface incident; When adopting side and upper and lower surface dual wavelength combination pump mode, the side is anti-reflection to the pump light of incident from the side, and upper and lower surface is to anti-reflection from the pump light of upper and lower surface incident, and end face is anti-reflection to output laser.
3. according to claim 1 or 2 described dual wavelength combination method for pumping, it is characterized in that: described pump light can send by wall scroll, face battle array diode or by the array that they are formed, or be directly coupled to gain medium inside, or be coupled to gain medium inside through optical fiber coupling, optical coupling system.
4. the dual wavelength of a lath-shaped gain medium makes up the laser gain module of method for pumping, the gain medium that contains pump light source and lath-shaped, it is characterized in that: the plating of the end face of described gain medium is to output laser with from the anti-reflection film of the pump light of surface feeding sputtering, and the side plating is to the anti-reflection film of the pump light of incident from the side; Or end face plating is to output laser with from the anti-reflection film of the pump light of surface feeding sputtering, and the upper and lower surface plating is to the anti-reflection film from the pump light of upper and lower surface incident; Or end face plating is to output laser anti-reflection film, and the side plating is to the anti-reflection film of the pump light of incident from the side, and the upper and lower surface plating is to the anti-reflection film from the pump light of upper and lower surface incident; Described pump light source is the light source of two kinds of different wave lengths, and its wavelength lays respectively on two different absworption peaks of gain medium absorption spectra.
5. according to the described laser gain module of claim 4, it is characterized in that: the gain medium of described lath-shaped is the gain medium with biabsorption peak or many absworption peaks structure.
6. according to the described laser gain module of claim 5, it is characterized in that: or the inclination vertical of the end face of the gain medium of described lath-shaped with upper and lower surface.
7. according to claim 4,5 or 6 described laser gain modules, it is characterized in that: the gain medium of described lath-shaped adopts the gain medium of single even doping, perhaps adopt the gain medium of the compound lath-shaped that thermal bonding technology or growing method obtain, its slat center is the gain medium that mixes, be non-doped dielectric all around, non-doped dielectric all around is transparent to pump light.
8. according to the described laser gain module of claim 7, it is characterized in that: the array that described pump light source adopts wall scroll diode, face battle array diode or is made up of them.
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| CN102856785A (en) * | 2012-09-06 | 2013-01-02 | 中国电子科技集团公司第十一研究所 | End face and side face composite pumping device and laser |
| CN102882109A (en) * | 2011-07-14 | 2013-01-16 | 中国科学院理化技术研究所 | Laser head device for solid laser |
| CN104332807A (en) * | 2014-11-05 | 2015-02-04 | 中国工程物理研究院激光聚变研究中心 | Slab laser amplifier and laser output method |
| CN107104350A (en) * | 2017-05-25 | 2017-08-29 | 衢州学院 | A kind of laser amplifier |
| CN109378685A (en) * | 2018-12-19 | 2019-02-22 | 中国电子科技集团公司第十研究所 | Pump arrangement |
| CN112152055A (en) * | 2020-10-21 | 2020-12-29 | 中国科学院长春光学精密机械与物理研究所 | Solid laser |
| CN113161861A (en) * | 2021-04-19 | 2021-07-23 | 北京工业大学 | Multiple-pass pumping Yb-YAG double-cladding planar waveguide laser amplifier |
| CN115084982A (en) * | 2022-07-15 | 2022-09-20 | 中国工程物理研究院应用电子学研究所 | Lath laser amplification gain module for high peak power laser |
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| CN102882109A (en) * | 2011-07-14 | 2013-01-16 | 中国科学院理化技术研究所 | Laser head device for solid laser |
| CN102856785A (en) * | 2012-09-06 | 2013-01-02 | 中国电子科技集团公司第十一研究所 | End face and side face composite pumping device and laser |
| CN104332807A (en) * | 2014-11-05 | 2015-02-04 | 中国工程物理研究院激光聚变研究中心 | Slab laser amplifier and laser output method |
| CN107104350A (en) * | 2017-05-25 | 2017-08-29 | 衢州学院 | A kind of laser amplifier |
| CN107104350B (en) * | 2017-05-25 | 2023-07-28 | 衢州学院 | Laser amplifier |
| CN109378685A (en) * | 2018-12-19 | 2019-02-22 | 中国电子科技集团公司第十研究所 | Pump arrangement |
| EP4166845A4 (en) * | 2020-06-12 | 2023-11-29 | Panasonic Intellectual Property Management Co., Ltd. | Light emitting device and light emitting system |
| CN112152055A (en) * | 2020-10-21 | 2020-12-29 | 中国科学院长春光学精密机械与物理研究所 | Solid laser |
| CN113161861A (en) * | 2021-04-19 | 2021-07-23 | 北京工业大学 | Multiple-pass pumping Yb-YAG double-cladding planar waveguide laser amplifier |
| CN115084982A (en) * | 2022-07-15 | 2022-09-20 | 中国工程物理研究院应用电子学研究所 | Lath laser amplification gain module for high peak power laser |
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