高重频双波长复合干扰激光器设计

第４０卷第４期国防科技大学学报Vol．４０No．４２０１８年８月JOURNAL OF NATIONAL UNIVERSITY OF DEFENSE TECHNOLOGY Aug．２０１８doi：１０．１１８８７／j．cn．２０１８０４００４http：／／journal．nudt．edu．cn 高重频双波长复合干扰激光器设计*

叶庆１，范一松１，２，王磊１，卞进田１

（１．国防科技大学脉冲功率激光技术国家重点实验室，安徽合肥 ２３００３７；

２．中国科学院安徽光学精密机械研究所安徽光子器件与材料省级实验室，安徽合肥 ２３００３１）

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１２mm、输出镜透过率为１０％、重复频率为５０kHz时，设计的激光器基频光平均功率为１８.９８W，倍频光平均功率为２.２２W，与仿真结论一致。

关键词：固体激光器；双波长复合输出；高重频；仿真与实验

中图分类号：TN２４２ 文献标志码：A文章编号：１００１－２４８６（２０１８）０４－０２２－０６

Ｄｅｓｉｇｎｏｆｄｕａｌ-ｗａｖｅｌｅｎｇｔｈｃｏｍｐｏｓｉｔｅｊａｍｍｉｎｇ

ｌａｓｅｒｗｉｔｈｈｉｇｈ-ｒｅｐｅｔｉｔｉｖｅｆｒｅｑｕｅｎｃｙ

YE Qing１，FAN Yisong１，２，WANG Lei１，BIAN Jintian１

（１．State Key Laboratory of Pulsed Power Laser Technology，National University of Defense Technology，Hefei２３００３７，China；

２．Anhui Provincial Laboratory of Photonic Devices and Materials，Anhui Institute of

Optics and Fine Mechanics，Chinese Academy of Sciences，Hefei２３００３１，China）

Ａｂｓｔｒａｃｔ：In order to solve the contradiction between high repetition rate of fundamental wave and high average power of second-harmonic wave，a new１０６４nm／５３２nm 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 KTiOPO４crystal is chosen as１２mm，the transmissivity of the output mirror is fixed to１０％，and the Q-switching frequency is selected as ５０kHz，the average output power of the fundamental wave is１８．９８W，and the average power of the output of second-harmonic wave is２．２２W．Ｋｅｙｗｏｒｄｓ：solid-state laser；dual-wavelength composite output；high-repetitive frequency；simulation and experiment

１０６４nm和５３２nm的双波长全固态激光器在激光清洗、激光医疗、激光探测等领域具有重要的应用价值［１－３］。不同的应用领域对激光器的性能指标要求不同，在激光对抗领域首先需要两路激光同时输出，从而减少干扰激光器的数量以提高设备的紧凑性［４］，其次需要５３２nm倍频激光平均功率尽可能大，以饱和干扰电视成像侦察与制导系统，１０６４nm基频激光频率应尽可能高，以对抗基于波门识别原理的激光测距或半主动制导系统［５－７］。

目前，国内外关于双波长激光技术的研究多集中在单波长可切换输出方面，追求同一时刻某一波长的激光高性能指标［８－１１］。例如，对于基频光（Fundamental Wave，FW）重复频率可以做到１００kHz以上，对于倍频光（Second-Harmonic

Wave，SHW）平均输出功率可以做到百瓦以上，

*收稿日期：２０１８－０１－１４

基金项目：脉冲功率激光技术国家重点实验室主任基金资助项目（SKL２０１５ZR０１）

作者简介：叶庆（１９８１—），男，四川泸州人，助理研究员，博士，E-mail：yeqing０５１８＠sina．com 万方数据