高重频双波长复合干扰激光器设计
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摘要
为解决基频光高重频与倍频光高平均功率之间的矛盾,设计了一台干扰用高重频双波长复合输出激光器。静态仿真了泵浦源效率、激光晶体受热和受力分布、激光高斯模式特征,得到了该激光器的复合输出特性。动态仿真调Q频率、倍频晶体长度对复合输出的影响以及分析倍频晶体热效应,发现在泵浦功率和谐振腔结构不变的前提下,需先满足基频光高重频工作,再优化倍频晶体长度和控制倍频晶体温度可提高倍频光的输出功率。按上述仿真结论开展的验证实验结果表明:当磷酸氧钛钾晶体长度为12 mm、输出镜透过率为10%、重复频率为50 k Hz时,设计的激光器基频光平均功率为18. 98 W,倍频光平均功率为2. 22 W,与仿真结论一致。
In order to solve the contradiction between high repetition rate of fundamental wave and high average power of second-harmonic wave,a new 1064 nm/532 nm dual-wavelength composite jamming laser with high-repetitive frequency was designed. The composite output characteristics of the laser were obtained by the static analysis of the pump source' s efficiency,heat and force distribution of crystal,and by the Gauss mode of laser. The influence on the dual-wavelength composite output was analyzed by changing the Q-switching frequency,the length of the second harmonic generation crystal and by simulating the thermal effect of second harmonic generation crystal. It is found that the high frequency of fundamental wave should be satisfied first,and the output power of second-harmonic wave can be improved by optimizing the length of the second harmonic generation crystal and by controlling the temperature of second harmonic generation crystal under the condition of the constant pumping power and the structure of the resonator. The simulation conclusion was verified by an experiment. The experimental results show that when the length of KTi OPO4 crystal is chosen as 12 mm,the transmissivity of the output mirror is fixed to 10%,and the Q-switching frequency is selected as50 kHz,the average output power of the fundamental wave is 18. 98 W,and the average power of the output of second-harmonic wave is 2. 22 W.
In order to solve the contradiction between high repetition rate of fundamental wave and high average power of second-harmonic wave,a new 1064 nm/532 nm dual-wavelength composite jamming laser with high-repetitive frequency was designed. The composite output characteristics of the laser were obtained by the static analysis of the pump source' s efficiency,heat and force distribution of crystal,and by the Gauss mode of laser. The influence on the dual-wavelength composite output was analyzed by changing the Q-switching frequency,the length of the second harmonic generation crystal and by simulating the thermal effect of second harmonic generation crystal. It is found that the high frequency of fundamental wave should be satisfied first,and the output power of second-harmonic wave can be improved by optimizing the length of the second harmonic generation crystal and by controlling the temperature of second harmonic generation crystal under the condition of the constant pumping power and the structure of the resonator. The simulation conclusion was verified by an experiment. The experimental results show that when the length of KTi OPO4 crystal is chosen as 12 mm,the transmissivity of the output mirror is fixed to 10%,and the Q-switching frequency is selected as50 kHz,the average output power of the fundamental wave is 18. 98 W,and the average power of the output of second-harmonic wave is 2. 22 W.
引文
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[12]沈兆国,王建洲,董涛,等.水下探测用高重频双波段激光器[J].应用光学,2017,38(4):670-673.SHEN Zhaoguo,WANG Jianzhou,DONG Tao,et al. High repetition rate dual-wavelength laser for under water detection[J]. Journal of Applied Optics,2017,38(4):670-673.(in Chinese)
[13]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.WANG Lei,NIE Jinsong,WANG Jingnan,et al. Parameter optimization of all solid state laser dual wavelength composite output cavity[J]. Laser&Infrared,2016,46(11):1353-1357.(in Chinese)
[14]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):0406003-1-0406003-7.WANG Lei,NIE Jinsong,YE Qing,et al. Study on thermal effect and compensation technology of 0. 53μm all-solid-state laser[J]. Infrared and Laser Engineering,2017,46(4):0406003-1-0406003-7.(in Chinese)
[15] Sabaeian M, Jalil-Abadi F S, Rezaee M M, 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.
[2]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.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)
[3]延新杰,李磊. 1064 nm/532 nm双波长自由切换输出激光器[J].光电技术应用,2015,30(6):37-39.YAN Xinjie,LI Lei. 1064 nm and 532 nm dual-wavelength switchable solid state laser[J]. Electro-Optic Technology Application,2015,30(6):37-39.(in Chinese)
[4]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.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):256-262.(in Chinese)
[5]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.ZHOU Ming,ZHAO Yuanan,LI Dawei,et al. Laser damage of optical film with the combined irradiation of 1064 nm and532 nm pulse[J]. Chinese Journal of Lasers, 2009,36(11):3050-3054.(in Chinese)
[6]吕跃广,孙晓泉.激光对抗原理与应用[M].北京:国防工业出版社,2015.LYU Yueguang,SUN Xiaoquan. Fundamentals and applications of laser countermeasures[M]. Beijing:National Defense Industry Press,2015.(in Chinese)
[7] Li G,Li L,Shen H B,et al. Quantitative evaluation of high repetition rate laser jamming effect on the pulsed laser rangefinder[J]. Optik-International Journal for Light and Electron Optics,2014,125(10):2450-2453.
[8]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.CHENG Yong, LU Changyong, LIU Xu, et al. Dualwavelength switchable soild state laser[J]. Chinese Journal of lasers,2010,37(9):2299-2302.(in Chinese)
[9]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.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)
[10] Ye P P,Zhu S Q,Li Z,et al. Passively Q-switched dualwavelength green laser with an Yb:YAG/Cr4+:YAG/YAG composite crystal[J]. Optics Express, 2017, 25(5):5179-5185.
[11] Wang Y Y,Xu D G,Liu C M,et al. A high-power highstability 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.
[12]沈兆国,王建洲,董涛,等.水下探测用高重频双波段激光器[J].应用光学,2017,38(4):670-673.SHEN Zhaoguo,WANG Jianzhou,DONG Tao,et al. High repetition rate dual-wavelength laser for under water detection[J]. Journal of Applied Optics,2017,38(4):670-673.(in Chinese)
[13]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.WANG Lei,NIE Jinsong,WANG Jingnan,et al. Parameter optimization of all solid state laser dual wavelength composite output cavity[J]. Laser&Infrared,2016,46(11):1353-1357.(in Chinese)
[14]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):0406003-1-0406003-7.WANG Lei,NIE Jinsong,YE Qing,et al. Study on thermal effect and compensation technology of 0. 53μm all-solid-state laser[J]. Infrared and Laser Engineering,2017,46(4):0406003-1-0406003-7.(in Chinese)
[15] Sabaeian M, Jalil-Abadi F S, Rezaee M M, 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.
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