热近非稳腔高重频双波长复合输出激光器研究
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摘要
1064 nm/532 nm双波长固态激光器在多个领域应用广泛。针对目前该类激光器分光路可切换输出研究较多,而复合输出研究缺乏的现状,通过建立含热透镜的等价谐振腔模型,结合谐振腔稳定性和"热近非稳谐振腔"理论确定了最佳腔长,利用软件仿真分析了倍频晶体的长度、输出镜基频透过率、调Q频率的大小对复合输出的影响,根据双路激光干扰的实际需求,确定了最佳复合输出参数,从而完成了一台1064 nm/532 nm高重频双波长复合输出激光器的设计。实验表明,KTP晶体长度选为12 mm,输出镜基频透过率选为15%,调Q频率选为50 k Hz时,在最大泵浦功率下,基频光输出的平均功率为28.82 W,倍频光的输出的平均功率为2.23 W。测量得到的激光近场发散角与光斑半径的乘积近似等于同样位置处基模高斯光束发散角与光斑半径的乘积,这说明所设计的激光器在最大泵浦功率条件下是以近似基模的方式运转,具有较好的光束质量。
With its wide-spread application in various fields,1064 nm/532 nm dual-wavelength solid-state laser has given rise to a bunch of studies upon its optical path switching output. In contrast,there is still a lack of study of composite output. A new dual-wavelength composite output laser with high-repetitive frequency was designed. Firstly,an equivalent resonator model with thermal lens was established,and then the optimum cavity length was determined by combining the stability of resonator and the theory of"near thermal unstable resonator",then the influence of the frequency doubling crystal length,the fundamental wave( FW) transmissivity of the output mirror,and the Q-switch frequency on the composite output was analyzed by means of software simulation,finally,the optimum composite output parameters ware determined according to the actual requirements of the double channel laser jamming. The experimental results show that when the length of KTP crystal is chosen as 12 mm,the FW transmissivity of the output mirror is fixed to 15%,and the Q frequency is selected as 50 k Hz,the average output power of the FW is 28. 82 W,and the average power of the output of second-harmonic wave( SHW) is 2. 23 W under maximum pumping power. The product of the laser near field divergence angle and the laser spot radius is close to the product of the divergence angle of the fundamental model Gauss beam and the radius of the spot in the same position. The results show that the designed laser works in approximate fundamental mode under the maximum pumping power,and it has better beam quality.
With its wide-spread application in various fields,1064 nm/532 nm dual-wavelength solid-state laser has given rise to a bunch of studies upon its optical path switching output. In contrast,there is still a lack of study of composite output. A new dual-wavelength composite output laser with high-repetitive frequency was designed. Firstly,an equivalent resonator model with thermal lens was established,and then the optimum cavity length was determined by combining the stability of resonator and the theory of"near thermal unstable resonator",then the influence of the frequency doubling crystal length,the fundamental wave( FW) transmissivity of the output mirror,and the Q-switch frequency on the composite output was analyzed by means of software simulation,finally,the optimum composite output parameters ware determined according to the actual requirements of the double channel laser jamming. The experimental results show that when the length of KTP crystal is chosen as 12 mm,the FW transmissivity of the output mirror is fixed to 15%,and the Q frequency is selected as 50 k Hz,the average output power of the FW is 28. 82 W,and the average power of the output of second-harmonic wave( SHW) is 2. 23 W under maximum pumping power. The product of the laser near field divergence angle and the laser spot radius is close to the product of the divergence angle of the fundamental model Gauss beam and the radius of the spot in the same position. The results show that the designed laser works in approximate fundamental mode under the maximum pumping power,and it has better beam quality.
引文
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[10]LIU Chang.Research of LD pump high-power soild laser with plano-convex resonator[D].Shenyang:Shenyang Normal University,2012:23-33.(in Chinese)刘畅.LD泵浦高功率固体激光器平凸谐振腔的研究[D].沈阳:沈阳师范大学,2012:23-33.
[11]WANG Lei,NIE Jinsong,YE Qing,et al.Study on thermal effect and compensation technology of 0.53μm allsolid-state laser[J].Infrared and Laser Engineering,2017,46(4):0406003-1-0406003-7.(in Chinese)王磊,聂劲松,叶庆,等.0.53μm全固态激光器热效应及其补偿技术研究[J].红外与激光工程,2017,46(4):0406003-1-0406003-5.
[12]Wang,Yuye,Xu Degang,Liu Changming,et al.A highpower high-stability Q-switched green laser with intracavity frequency doubling using a diode-pumped composite ceramic Nd∶YAG laser[J].Chinese Physics B,2012,21(9):0942121-0942126.
[13]GAO Hongwei,PENG Qinjun,CUI Qianjin,et al.Double focus thermally-near-unstable resonator laser[J].Chines Journal of lasers,2009,36(1):56-58.(in Chinese)高宏伟,彭钦军,崔前进,等.双热焦距激光热近非稳腔系统[J].中国激光,2009,36(1):56-58.
[14]WANG Lei,NIE Jinsong,WANG Jinnan,et al.Parameter optimization of all solid state laser dual wavelength composite output cavity[J].Laser&Infrared,2016,46(11):1353-1357.(in Chinese)王磊,聂劲松,王景楠,等.全固态激光双波长复合输出腔参数优化[J].激光与红外,2016,46(11):1353-1357.
[15]GENG Aicong,ZHAO Ci,BO Yong,et al.A method for measuring thermal focal length of LD-side-pumped laser crystal[J].Acta Physica Sinica,2008,57(11):6987-6991.(in Chinese)耿爱丛,赵慈,薄勇,等.一种测量二极管侧面抽运固体激光器热焦距的方法[J].物理学报,2008,57(11):6987-6991.
[2]ZHANG Hongbo,LI Zhengjia,ZHU Changhong.The characteristic research for long-pulse double-wavelength Nd∶YAG medical laser system[J].Laser Journal,2003,24(6):68-69.(in Chinese)张红波,李正佳,朱长虹.长脉冲双波长Nd∶YAG医用激光器的设计研究[J].激光杂志,2003,24(6):68-69.
[3]YAN Xinjie,LI lei.1064 am and 532 am Dual—wavelength Switchable Solid State Laser[J].Optoelectronic Technology Application,2015,30(6):37-39.(in Chinese)延新杰,李磊.1064nm/532nm双波长自由切换输出激光器[J].光电技术应用,2015,30(6):37-39.
[4]CHENG Yong,LU Changyong,LIU Xu,et al.Dual-wavelength switchable soild state laser[J].Chines Journal of Lasers,2010,37(9):2299-2302.(in Chinese)程勇,卢常勇,刘旭,等.双波长自由切换输出固体激光器[J].中国激光,2010,37(9):2299-2302.
[5]GENG Aicong,XU Denghui,LI Xiong,et al.Reviews and prospects of all sold sate green laser technology[J].Laser&Infrared,2011,41(1):3-7.(in Chinese)耿爱丛,徐登辉,李熊,等.全固态绿光激光技术的评述与展望[J].激光与红外,2011,41(1):3-7.
[6]ZHOU Ming,ZHAO Yuan'an,LI Dawei,et al.Laser damage of optical film with the combined irradiation of 1064am and 532 am Pulse[J].Chinese Journal of Lasers,2009,36(11):3050-3054.(in Chinese)周明,赵元安,李大伟,等.1064 nm和532 nm激光共同辐照薄膜的损伤[J].中国激光,2009,36(11):3050-3054.
[7]WANG Lei,ZHAO Minghui,NIE Jinsong,et al.Experimental study on 0.53μm and 1.06μm composite laser jamming military optoelectronic devices[J].Journal of Optoelectronics·Laser,2017,(3):256-26.(in Chinese)王磊,赵明辉,聂劲松,等.0.53μm和1.06μm双波长复合激光干扰光电器件的实验研究[J].光电子·激光,2017,(3):256-262.
[8]Pingping Ye,Siqi Zhu,Zhen Li,et al.Passively Qswitched dual-wavelength green laser with an Yb∶YAG/Cr4+∶YAG/YAG composite crystal[J].Optics Express,2017,25(5):5179.
[9]M Sabaeian,FS Jalil-Abadi,MM Rezaee,et al.Temperature Distribution in a Gaussian End-Pumped Nonlinear KTP Crystal:the Temperature Dependence of Thermal Conductivity and Radiation Boundary Condition[J].Brazilian Journal of Physics,2015,45(1):1-9.
[10]LIU Chang.Research of LD pump high-power soild laser with plano-convex resonator[D].Shenyang:Shenyang Normal University,2012:23-33.(in Chinese)刘畅.LD泵浦高功率固体激光器平凸谐振腔的研究[D].沈阳:沈阳师范大学,2012:23-33.
[11]WANG Lei,NIE Jinsong,YE Qing,et al.Study on thermal effect and compensation technology of 0.53μm allsolid-state laser[J].Infrared and Laser Engineering,2017,46(4):0406003-1-0406003-7.(in Chinese)王磊,聂劲松,叶庆,等.0.53μm全固态激光器热效应及其补偿技术研究[J].红外与激光工程,2017,46(4):0406003-1-0406003-5.
[12]Wang,Yuye,Xu Degang,Liu Changming,et al.A highpower high-stability Q-switched green laser with intracavity frequency doubling using a diode-pumped composite ceramic Nd∶YAG laser[J].Chinese Physics B,2012,21(9):0942121-0942126.
[13]GAO Hongwei,PENG Qinjun,CUI Qianjin,et al.Double focus thermally-near-unstable resonator laser[J].Chines Journal of lasers,2009,36(1):56-58.(in Chinese)高宏伟,彭钦军,崔前进,等.双热焦距激光热近非稳腔系统[J].中国激光,2009,36(1):56-58.
[14]WANG Lei,NIE Jinsong,WANG Jinnan,et al.Parameter optimization of all solid state laser dual wavelength composite output cavity[J].Laser&Infrared,2016,46(11):1353-1357.(in Chinese)王磊,聂劲松,王景楠,等.全固态激光双波长复合输出腔参数优化[J].激光与红外,2016,46(11):1353-1357.
[15]GENG Aicong,ZHAO Ci,BO Yong,et al.A method for measuring thermal focal length of LD-side-pumped laser crystal[J].Acta Physica Sinica,2008,57(11):6987-6991.(in Chinese)耿爱丛,赵慈,薄勇,等.一种测量二极管侧面抽运固体激光器热焦距的方法[J].物理学报,2008,57(11):6987-6991.