Efficient fifth harmonic generation of Nd:glass laser in ADP crystals  

作　　者：Fang Wang Xuewei Deng Liquan Wang Fuquan Li Wei Han Wei Zhou Xiaoxia Huang Huaiwen Guo Qihua Zhu 王芳;邓学伟;王礼权;李富全;韩伟;周维;黄小霞;郭怀文;朱启华(Research Center of Laser Fusion, China Academy of Engineering Physics)

机构地区：[1]Research Center of Laser Fusion,China Academy of Engineering Physics,Mianyang 621999,China

出　　处：《Chinese Optics Letters》2019年第12期53-58,共6页中国光学快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.11704352,61805223,and 61775199)

摘　　要：Fifth harmonic generation(5th HG) of a Nd:glass laser is an effective way to acquire high-energy coherent deepultraviolet radiation near 200 nm. In this work, cascade generation of the fifth harmonic of a Nd:glass laser in a 5 mm ammonium dihydrogen phosphate(ADP) crystal was investigated, and maximum conversion efficiency of 14% and large angular acceptance of 45 mrad were demonstrated at a noncritical phase-matching temperature of-75.1°C. However, as the results reveal, the temperature sensitivity and nonlinear absorption would hinder its high-energy application. As for that, based on the complementary relationship of the angle and temperature in the phase-matching condition, an upgraded focusing 5th HG design coupled with the cylindrical temperature distribution scheme was proposed. By this upgraded focusing design, more than the improvement of the conversion efficiency, the output 5ω near-field intensity distribution turns out to be insensitive to the temperature gradient. Potentially, this idea can be applied for many other frequency conversion schemes such as high-repetition frequency lasers, which have similar temperature gradient problems.Fifth harmonic generation(5th HG)of a Nd:glass laser is an effective way to acquire high-energy coherent deepultraviolet radiation near 200 nm.In this work,cascade generation of the fifth harmonic of a Nd:glass laser in a 5mm ammonium dihydrogen phosphate(ADP)crystal was investigated,and maximum conversion efficiency of 14%and large angular acceptance of 45 mrad were demonstrated at a noncritical phase-matching temperature of-75.1℃.However,as the results reveal,the temperature sensitivity and nonlinear absorption would hinder its high-energy application.As for that,based on the complementary relationship of the angle and temperature in the phase-matching condition,an upgraded focusing 5th HG design coupled with the cylindrical temperature distribution scheme was proposed.By this upgraded focusing design,more than the improvement of the conversion efficiency,the output 5ω near-field intensity distribution turns out to be insensitive to the temperature gradient.Potentially,this idea can be applied for many other frequency conversion schemes such as high-repetition frequency lasers,which have similar temperature gradient problems.

关 键 词：HARMONIC GLASS MATCHING 

分 类 号：TN248[电子电信—物理电子学]