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.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
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)
关键词
傅里叶光学
相干合束
相位波动
振幅波动
远场特性
Fourier optics
coherent combination
phase fluctuation
swing fluctuation
far field characteristics
