LD双端面泵浦Nd:YAG激光器实验研究
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摘要
【目的】对双端面泵浦的Nd:YAG激光器进行实验研究。【方法】设计了一种对激光晶体YAG进行双端面泵浦的结构方式,提出对激光晶体介质进行传导冷却与水冷冷却相结合的散热方法,并进一步分析在双端面泵浦下晶体内部的热功率分布,并对晶体内的温度场分布进行了数值模拟计算。【结果】采用U型平行平面腔结构,在注入总泵浦光为33.8W时,得到最高输出功率22.30 W,光-光转换斜效率为71.2%,出光阈值功率为6.68 W,输出光束为基模,M2为1.4。【结论】双端面泵浦YAG激光器比单端面泵浦具有更高的转换效率、更好的光束质量,具有很强的实用价值。
[Purposes]Experimental study on the Nd:YAG laser of double end pump is conducted.[Methods]Innovative proposed to the YAG laser crystal structure of the double pump,the conduction cooling and water cooling both been used in YAG crystal and the thermal dissipation structure been designed.The distribution inside of crystal thermal under the double pumping been analyzed,and within the crystals on the numerical simulation on temperature field distribution.The laser gain dielectric Nd:YAG was cooled by a U-type parallel flat cavity structure.[Findings]The maximum output power is 22.30 W when the total pump was 33.8 W.Lightlight conversion efficiency of oblique was 71.2%,and the threshold power is 6.68 W.The output beam was the base model and the M2 was 1.4.[Conclusions]Experiments show that double end-pumped YAG laser has a strong practical value with its higher conversion and better beam quality.
[Purposes]Experimental study on the Nd:YAG laser of double end pump is conducted.[Methods]Innovative proposed to the YAG laser crystal structure of the double pump,the conduction cooling and water cooling both been used in YAG crystal and the thermal dissipation structure been designed.The distribution inside of crystal thermal under the double pumping been analyzed,and within the crystals on the numerical simulation on temperature field distribution.The laser gain dielectric Nd:YAG was cooled by a U-type parallel flat cavity structure.[Findings]The maximum output power is 22.30 W when the total pump was 33.8 W.Lightlight conversion efficiency of oblique was 71.2%,and the threshold power is 6.68 W.The output beam was the base model and the M2 was 1.4.[Conclusions]Experiments show that double end-pumped YAG laser has a strong practical value with its higher conversion and better beam quality.
引文
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[3]商继敏,任宇芬.侧面紧耦合泵浦微型激光器研究[J].红外与激光工程,2013,42(5):1174-1178.SHANG J M,REN Y F.Tightly coupled side-pumping technology ofminiature solid state laser[J].Infrared and Laser Engineering,2013,42(5):1174-1178.
[4]王茜,王勇刚,段利娜,等.LD侧面泵浦半导体可饱和吸收镜被动锁模激光器[J].光子学报,2015,44(7):120-124.WANG X,WANG Y G,DUAN L N,et al.LD sidepumped passive mode-locked Nd:YAG laser with semiconductor saturable absorption mirror[J].Acta Photonica Sinica,2015,44(7):120-124.
[5]王喆,刘洋,刘磊,等.LD侧泵Nd:YAG薄板条MOPA激光器[J].激光与红外,2015,45(4):364-368.WANG Z,LIU Y,LIU L,et al.Laser diode side-pumped Nd:YAG thin slab laser based on MOPA[J].Laser&Infrared,2015,45(4):364-368.
[6]王志勇,李晓青,焦月春,等.激光二极管端面纵向泵浦Nd:YVO4激光器的热效应研究[J].量子光学学报,2011,17(2):158-162.WANG Z Y,LI X Q,JIAO Y C,et al.Investigation of thermal lensing effect in Nd:YVO4laser end-pumped by laserdiode[J].Acta Sinica Quantum Optica,2011,17(2):158-162.
[7]侯立群,樊仲维,王培峰,等.LD端面泵浦Nd:YVO4激光器热管理结构的研究[J].红外与激光工程,2011,40(3):424-428.HOU L Q,FAN Z W,WANG P F,et al.Thermal management configuration of laser diode end-pumped d:YVO4laser[J].Infrared and Laser Engineering,2011,40(3):424-428.
[8]刘宗华,郑义.LD泵浦被动调Q-Yb3+:YAG微晶片激光器的优化设计[J].发光学报,2013,34(9):1219-1226.LIU Z H,ZHENG Y.Design and optimization of LDpumpedpassively Q-switched Yb3+:YAG microchip laser[J].Journal of Luminescence,2013,34(9):1219-1226.
[9]郑加安,赵圣之,王青圃,等.晶体热效应对LD端面泵浦固体激光器优化设计的影响[J].光子学报,200,30(6):724-729.ZHENG J A,ZHAO S Z,WANG Q P,et al.Influence of thermal effect in gain-media on optimum design of LD end-pumped sold state laser[J].Acta Photonica Sinica,2001,30(6):724-729.
[10]郑义,高明义,姚建铨.LD端面泵浦各向异性激光介质的热效应研究[J].光电子激光,2003,14(10):1094-1098.ZHENG Y,GAO M Y,YAO J Q.Study on thermal effect of anisotropic laser medium by LD end-pumped[J].Journal of Optoelectronics·Laser,2003,14(10):1094-1098.
[11]李隆,聂建萍,史彭,等.端面泵浦热传导各向异性激光棒的温度场[J].光学精密工程,2009,17(12):2931-2938.LI L,NIE J P,SHI P,et al.Temperature field characteristics of thermal conductiveanisotropic laser rods by LD end-pumped[J].Opt Precision Eng,2009,17(12):2931-2938.
[12]李隆,耿鹰鸽,余庚华,等.脉冲激光二极管端面泵浦Nd:YAG圆棒晶体热效应[J].应用激光,2015,35(5):597-602.LI L,GENG Y G,YU G H,et al.Thermaleffect of Nd:YAGrod crystal end pumped by pulse LD[J].Applied Laser,2015,35(5):597-602.
[13]王旭,程光华,孙哲.LD泵浦的被动调QYb:YAG薄片激光器实验研究[J].光子学报,2016,45(3):51-55.WANG X,CHENG G H,SUN Z.Research of LDpumped passively Q-switched Yb:YAGthin disk laser[J].Acta Photonica Sinica,2016,45(3):51-55.
[14]江炜,何青,陈振强,等.基于Nd:YAG/Cr:YAG/YAG键合晶体LD侧面泵浦激光器[J].光子学报,2014,43(4):139-142.JIANG W,HE Q,CHEN Z Q,et al.LD side-pumped laser based on Nd:YAG/Cr:YAG compositecrystal[J].Acta Photonica Sinica,2014,43(4):139-142.
[15]耿鹰鸽,李隆,潘晓瑞,等.LD端面泵浦变热导率圆片Yb:YAG激光器的热效应[J].光学技术,2017,43(2):103-107.GENG Y G,LI L,PAN X R,et al.Thermal effect of variable thermal-conductivity circular Yb:YAG crystal end pumped by pluse LD[J].Optical Technique,2017,43(2):103-107.
[16]李义民,檀慧明,付喜宏,等.LD泵浦腔内倍频Nd:YAG/LBO蓝光473nm激光器的低噪声运转[J].光学精密工程,2008,16(1):11-15.LI Y M,TAN H M,FU X H,et al.LD pumped intracavity frequency doubling473nmNd:YAG/LBO laser with low noise operation[J].Opt Precision Eng,2008,16(1):11-15.
[17]齐兵,李隆,甘安生,等.LD端面泵浦变热传导系数Nd:YAG晶棒温场特性[J].红外与激光工程,2012,41(5):1174-1179.QI B,LI L,GAN A S,et al.Temperature field characteristics analysis of Nd:YAG rod withvariable thermal-conductivity coefficient by LD end-pump[J].Infrared and Laser Engineering,2012,41(5):1174-1179.
[2]李斌,姚矣,李永大,等.LD泵浦Nd:YAG全固态蓝光激光器[J].应用激光,2008,28(4):306-309.LI B,YAO Y,LI Y D,et al.LD-pumped Nd:YAG all solid-state blue laser[J].Applied Laser,2008,28(4):306-309.
[3]商继敏,任宇芬.侧面紧耦合泵浦微型激光器研究[J].红外与激光工程,2013,42(5):1174-1178.SHANG J M,REN Y F.Tightly coupled side-pumping technology ofminiature solid state laser[J].Infrared and Laser Engineering,2013,42(5):1174-1178.
[4]王茜,王勇刚,段利娜,等.LD侧面泵浦半导体可饱和吸收镜被动锁模激光器[J].光子学报,2015,44(7):120-124.WANG X,WANG Y G,DUAN L N,et al.LD sidepumped passive mode-locked Nd:YAG laser with semiconductor saturable absorption mirror[J].Acta Photonica Sinica,2015,44(7):120-124.
[5]王喆,刘洋,刘磊,等.LD侧泵Nd:YAG薄板条MOPA激光器[J].激光与红外,2015,45(4):364-368.WANG Z,LIU Y,LIU L,et al.Laser diode side-pumped Nd:YAG thin slab laser based on MOPA[J].Laser&Infrared,2015,45(4):364-368.
[6]王志勇,李晓青,焦月春,等.激光二极管端面纵向泵浦Nd:YVO4激光器的热效应研究[J].量子光学学报,2011,17(2):158-162.WANG Z Y,LI X Q,JIAO Y C,et al.Investigation of thermal lensing effect in Nd:YVO4laser end-pumped by laserdiode[J].Acta Sinica Quantum Optica,2011,17(2):158-162.
[7]侯立群,樊仲维,王培峰,等.LD端面泵浦Nd:YVO4激光器热管理结构的研究[J].红外与激光工程,2011,40(3):424-428.HOU L Q,FAN Z W,WANG P F,et al.Thermal management configuration of laser diode end-pumped d:YVO4laser[J].Infrared and Laser Engineering,2011,40(3):424-428.
[8]刘宗华,郑义.LD泵浦被动调Q-Yb3+:YAG微晶片激光器的优化设计[J].发光学报,2013,34(9):1219-1226.LIU Z H,ZHENG Y.Design and optimization of LDpumpedpassively Q-switched Yb3+:YAG microchip laser[J].Journal of Luminescence,2013,34(9):1219-1226.
[9]郑加安,赵圣之,王青圃,等.晶体热效应对LD端面泵浦固体激光器优化设计的影响[J].光子学报,200,30(6):724-729.ZHENG J A,ZHAO S Z,WANG Q P,et al.Influence of thermal effect in gain-media on optimum design of LD end-pumped sold state laser[J].Acta Photonica Sinica,2001,30(6):724-729.
[10]郑义,高明义,姚建铨.LD端面泵浦各向异性激光介质的热效应研究[J].光电子激光,2003,14(10):1094-1098.ZHENG Y,GAO M Y,YAO J Q.Study on thermal effect of anisotropic laser medium by LD end-pumped[J].Journal of Optoelectronics·Laser,2003,14(10):1094-1098.
[11]李隆,聂建萍,史彭,等.端面泵浦热传导各向异性激光棒的温度场[J].光学精密工程,2009,17(12):2931-2938.LI L,NIE J P,SHI P,et al.Temperature field characteristics of thermal conductiveanisotropic laser rods by LD end-pumped[J].Opt Precision Eng,2009,17(12):2931-2938.
[12]李隆,耿鹰鸽,余庚华,等.脉冲激光二极管端面泵浦Nd:YAG圆棒晶体热效应[J].应用激光,2015,35(5):597-602.LI L,GENG Y G,YU G H,et al.Thermaleffect of Nd:YAGrod crystal end pumped by pulse LD[J].Applied Laser,2015,35(5):597-602.
[13]王旭,程光华,孙哲.LD泵浦的被动调QYb:YAG薄片激光器实验研究[J].光子学报,2016,45(3):51-55.WANG X,CHENG G H,SUN Z.Research of LDpumped passively Q-switched Yb:YAGthin disk laser[J].Acta Photonica Sinica,2016,45(3):51-55.
[14]江炜,何青,陈振强,等.基于Nd:YAG/Cr:YAG/YAG键合晶体LD侧面泵浦激光器[J].光子学报,2014,43(4):139-142.JIANG W,HE Q,CHEN Z Q,et al.LD side-pumped laser based on Nd:YAG/Cr:YAG compositecrystal[J].Acta Photonica Sinica,2014,43(4):139-142.
[15]耿鹰鸽,李隆,潘晓瑞,等.LD端面泵浦变热导率圆片Yb:YAG激光器的热效应[J].光学技术,2017,43(2):103-107.GENG Y G,LI L,PAN X R,et al.Thermal effect of variable thermal-conductivity circular Yb:YAG crystal end pumped by pluse LD[J].Optical Technique,2017,43(2):103-107.
[16]李义民,檀慧明,付喜宏,等.LD泵浦腔内倍频Nd:YAG/LBO蓝光473nm激光器的低噪声运转[J].光学精密工程,2008,16(1):11-15.LI Y M,TAN H M,FU X H,et al.LD pumped intracavity frequency doubling473nmNd:YAG/LBO laser with low noise operation[J].Opt Precision Eng,2008,16(1):11-15.
[17]齐兵,李隆,甘安生,等.LD端面泵浦变热传导系数Nd:YAG晶棒温场特性[J].红外与激光工程,2012,41(5):1174-1179.QI B,LI L,GAN A S,et al.Temperature field characteristics analysis of Nd:YAG rod withvariable thermal-conductivity coefficient by LD end-pump[J].Infrared and Laser Engineering,2012,41(5):1174-1179.