基于锥面衍射实现高效率双光栅光谱合成  

Realizing high efficiency spectral beam combining with dual-gratings based on conical diffraction

作　　者：吴娟[1] 李建民[1] 尹新启[1] 曾理江[2] 邱克强[3] 李朝明 颜宏[1] Wu Juan;Li Jianmin;Yin Xinqi;Zeng Lijiang;Qiu Keqiang;Li Chaoming;Yan Hong(Institute of Applied Electronics,CAEP,Mianyang,China;Department of Precision Instrument,State Key Laboratory of Precision Measurement Technology and Instruments,Tsinghua University,Beijing 100084,China;National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China;School of Optoelectronic Science and Engineering,Soochow University,Suzhou 215006,China)

机构地区：[1]中国工程物理研究院应用电子学研究所,四川绵阳621900 [2]清华大学精密仪器系精密测试技术及仪器国家重点实验室,北京100084 [3]中国科学技术大学国家同步辐射实验室,合肥230029 [4]苏州大学光电科学与工程学院,江苏苏州215006

出　　处：《强激光与粒子束》2020年第12期83-87,共5页High Power Laser and Particle Beams

摘　　要：分析了基于锥面衍射的双光栅光谱合成系统的可行性,设计了激光入射角为Littrow角附近的双多层介质膜(MLD)光栅光谱合成系统,开展了两路合成实验。当入射极角等于自准直入射角,入射方位角为6°时,光栅衍射效率近似等于光束自准直入射时的衍射效率。基于锥面衍射原理,对中心波长为1050.24 nm和1064.33 nm的两束光纤激光子束进行合成,入射极角为43.99°,测得合成效率为92.9%,较基于非锥面衍射的双光栅光谱合成系统的合成效率提高了8.8%;测得合成光斑光束质量Mx 2=1.204,My 2=1.467,与基于非锥面衍射的双光栅光谱合成系统输出光斑光束质量基本一致。The feasibility of realizing high efficiency spectral beam combining with multilayer dielectric(MLD)gratings based on conical diffraction was analyzed.The spectral beam combining approach was designed with the incident polar angle nearly equals to the Littrow angle based on the conical diffraction theory and two unit beams were experimentally combined.The experimental results indicate that,the diffraction efficiency nearly did not change in the case of conical diffraction whenθwas constant and=6°.The combining efficiency of the output beam which was composited by two unit beams(wavelength equals to 1050.24 nm and 1064.33 nm respectively)with incident polar angleθof 43.99°was 92.9%,8.8%higher than that of approach based on non-conical diffraction.The beam quality factor after combining were Mx^2=1.204 and My^2=1.467,which were almost equivalent to that of approach based on non-conical diffraction.

关 键 词：锥面衍射 非锥面衍射 双MLD光栅 光谱合成 合成效率 

分 类 号：TN248.1[电子电信—物理电子学]