La2CaB10O19晶体高效紫外激光输出研究  

Highly Efficient UV Laser Output of La2CaB10O19 Crystal

作　　者：王丽荣[1] 张国春[1] 冯景程 白磊 刘丽娟[1] 王晓洋[1] WANG Li-rong;ZHANG Guo-chun;FENG Jing-cheng;BAI Lei;LIU Li-juan;WANG Xiao-yang(Beijing Center for Crystal Research and Development,Technical Institute of Physics and Chemistry,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院理化技术研究所北京人工晶体研究与发展中心,北京100190 [2]中国科学院大学,北京100049

出　　处：《发光学报》2020年第2期140-145,共6页Chinese Journal of Luminescence

基　　金：国家自然科学基金(51890864,51972314)资助项目~~

摘　　要：La2CaB10O19(LCB)为可通过Nd∶YAG激光三倍频产生355 nm紫外激光的非线性光学晶体,其光学性能可与商用化的LiB 3O 5(LBO)晶体媲美,但抗潮解特性优势明显。本文对用LCB晶体实现355 nm紫外激光输出的三倍频产生过程进行了优化设计,利用走离补偿方法来提高激光输出转换效率。通过在光路中加入沿θ=45°方向切割、厚度为1.2 mm的方解石晶体走离补偿片,在脉冲宽度为60 ns、重复频率10 kHz的激光参数下实现355 nm输出功率由12 W提升至20 W;在脉冲宽度为25 ps、重复频率为10 Hz的激光参数下355 nm转换效率由28.3%提升至35.2%。La 2CaB 10 O 19(LCB)is a nonlinear crystal which can produce 355 nm ultraviolet(UV)laser output through the third harmonic generation(THG)of Nd∶YAG laser,its optical property is comparable to that of commercial LiB 3O 5(LBO)crystal,with an obvious advantage in its moisture resistance.In this paper,the THG process of 355 nm UV laser output with LCB crystal was optimized,and the walk-off compensating method was used to improve the conversion efficiency of laser output.By adding a calcite crystal compensator cut atθ=45°to the optical axis with a thickness of 1.2 mm,the output power of 355 nm can be increased from 12 W to 20 W under the laser parameters of 60 ns pulse width and 10 kHz repetition rate.When the pulse width is 25 ps and the repetition rate is 10 Hz,the conversion efficiency from 1064 nm to 355 nm is improved from 28.3%to 35.2%.

关 键 词：LCB 非线性光学晶体 紫外激光 三倍频 走离补偿 

分 类 号：TP394.1[自动化与计算机技术—计算机应用技术] TH691.9[自动化与计算机技术—计算机科学与技术]