光学参数对激光阵列相干合束远场特性的影响  

Effects of optical paramerters on the coherent combination of laser array in the far field

作　　者：李松柏[1] 

机构地区：[1]长江师范学院物理学及电子信息工程系,重庆408100

出　　处：《光学技术》2010年第2期256-259,共4页Optical Technique

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

摘　　要：利用傅里叶光学方法,获得了相干合束远场光强的解析表达式,讨论了相位、振幅和发光单元数目等光学参数对远场光束质量的影响。研究结果表明：随着参与合束的发光单元数目的增加,尖峰变锐;同相模的光能集中在更小的立体角内,使得相干合束的亮度增加;异相模的光束能量较为分散,其峰值光强有所降低;随着振幅比β的减少,相干合束远场光强的峰值相对变化率增加,远场光强分布出现了本底现象,远场干涉条纹对比度降低。Using the expression of the far-field of coherent combination beams deduced by Fourier method,the influnce of beam qulity with phase or swing and emitter in the far-field is discussed.Results show that the peak becoms sharp with the increases of combination beams numbers;the luminous energy of phase mode is centralized in the smallest three-dimensional angle,and the illumination of coherent combination beams is increased;the luminous energy of out phase mode becomes disperser,the peak strength is reduced;with the reduces of ratio of swing（β） reduces,ratio of relative peak of the far-field of coherent combined beams is increased,the distribution of optical strength in far field appears the phenomenon of background,the contrast ratio of the far-field interference stripe is reduced.

关 键 词：傅里叶光学 相干合束 光学参数 远场光束特性 

分 类 号：TN24[电子电信—物理电子学]