高功率激光系统中近场滤波设计与理论模拟  

Design and simulation of near-field filtering for high power laser system

作　　者：吴登生[1,2] 张翔[1,3,4] 熊宝星[1,3,4] 庄振武[1,3,4] 高帆[1,3,4] 袁孝[1,3,4] 

机构地区：[1]苏州大学现代光学技术研究所,江苏苏州215006 [2]中国工程物理研究院激光聚变研究中心,四川绵阳621900 [3]教育部/江苏省现代光学技术重点实验室,江苏苏州215006 [4]江苏省先进光学制造技术重点实验室,江苏苏州215006

出　　处：《强激光与粒子束》2014年第8期34-38,共5页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(91023009;61275140);江苏省研究生创新计划(CX2211_0095)

摘　　要：基于经典耦合波理论,分析了透射型体Bragg光栅的衍射特性,建立了透射型体Bragg光栅的设计体系。采用带有调制的超高斯光束,对高功率激光系统的近场滤波进行了理论模拟,采用软化因子、近场调制度、近场对比度分析了输出光束的近场质量,采用功率谱密度函数分析了近场滤波对不同空间频率的滤除能力。研究结果表明,近场滤波对0.3～2.0mm-1的中、高频调制具有显著的滤除作用。Diffraction characteristic of transmitting volume Bragg grating is analyzed with classical coupled wave theory, and the design method of transmitting volume Bragg grating is built. The near-field filtering effect is simulated with modulated super- Gaussian beam. The softening factor, near-field modulation and near-field contrast are used to analyze the beam quality. The power spectral density is used to describe the evolution of spatial frequency. The results show that the spatial frequencies from 0.3 mm 1 to 2.0 mm-1 are clean out with the near-field filtering, but the filtering effect is limited by the beam diffraction side- lobes of transmitting volume Bragg grating.

关 键 词：高功率激光系统 近场滤波 设计 理论模拟 

分 类 号：O436.1[机械工程—光学工程]