激光相干合成中单元的相位和振幅波动对合成光束远场分布的影响  

Effect of phase and amplitude fluctuation of single laser element on far field characteristics of coherently combined beam

作　　者：李松柏[1,2] 陈建国[2] 窦汝海[2] 史晓刚[2] 

机构地区：[1]长江师范学院物理学与电子工程学院,重庆408100 [2]四川大学电子信息学院,成都610064

出　　处：《强激光与粒子束》2011年第1期39-44,共6页High Power Laser and Particle Beams

基　　金：国家自然科学基金项目(60578013);重庆市教委科技基金项目(KJ091307)

摘　　要：运用傅里叶光学分析法推导出系统抖动造成单个光源的相位和振幅发生波动时的远场光强表达式,以1维阵列为例分析了系统抖动对远场的影响。研究表明:随着参与合束的发光单元数目的增加,尖峰变锐,能量更集中;系统抖动引起了远场峰值光强的减少,出现了本底现象,破坏了远场的对称性和光束质量;激光阵列单个光源的相位随机抖动应该控制在3π/8范围内;相干合束发光单元数目越多,系统抖动对远场的影响越小。With Fourier optics,the general expression of far-field intensity of coherently combined beam has been derived,which is affected by single beam＇s phase and amplitude fluctuation due to jitters in the system.The analysis using one-dimensional laser array shows that,the intensity peak becomes sharper and the energy centers in a smaller angle as the number of combined beams increases.The maximum intensity of far field reduces due to the jitters and the background appears,deteriorating the symmetry and quality of far field.Therefore,the stochastic fluctuation of phase should be controlled within 3π/8 for single light source of the laser array;the more the beams are combined,the less the influence of the system jitters on far field characteristics is.

关 键 词：傅里叶光学 相干合束 相位波动 振幅波动 远场特性 

分 类 号：O438.2[机械工程—光学工程]