高功率激光束的远场特性研究  

Far-field characteristics of high-power laser beams

作　　者：季小玲[1] 陶向阳 吕百达[1] 

机构地区：[1]四川大学激光物理与化学研究所,成都610064 [2]四川师范大学电子工程学院

出　　处：《激光技术》2004年第3期251-254,共4页Laser Technology

基　　金：国家高技术发展计划资助项目 (A82 30 72 ) ;四川省教育厅自然科学基金资助项目 (2 0 0 2A0 89)

摘　　要：采用场振幅沿x方向呈线性变化的非均匀光束模型 ,研究了非均匀场分布和内光路非线性热效应对远场特性的影响。研究表明 ,初始光束的非均匀分布会影响可聚焦能力 ,并引起像散。内光路的热效应会进一步减小可聚焦能力和加剧像散。此外 ,由于热效应 ,远场峰值光强要降低 ,且位置发生移动。By using a beam model with linear non-uniform field profile in the x direction,the effect of beam non-uniformity and nonlinear thermal blooming in the optical beam control system on the far-field characteristics of high-power laser beams is studied.It is found that the non-uniformity of the initial beam affects the focusability and results in the astigmatism.The thermal blooming gives rise to a further decrease of the focusability and a further increase of the astigmatism.In addition,the peak intensity in the far-field is reduced and its position shifts away owing to the thermal blooming.

关 键 词：高功率激光 非均匀性 内光路 热效应 远场特性 

分 类 号：TN012[电子电信—物理电子学]