摘要
基于光传输理论,获得了弱调制情况下光学元件"缺陷"分布功率谱密度(power spectral density,PSD)与光束近场强度分布PSD之间的定量关系;通过数值模拟的方法,针对高功率固体激光装置的基本单元(线性介质、非线性介质以及空间滤波器)对获得的理论关系进行了具体的验证和讨论.研究结果表明,弱调制下,只存在振幅型或位相型"缺陷"分布时,光学元件"缺陷"分布PSD与光束近场强度分布PSD通过近场强度分布PSD的系统传输因子联系,传输因子与系统的构型和运行状态有关.研究结果为光学元件"缺陷"分布指标的获得提供了理论基础,对高功率固体激光装置负载能力的提升起到了一定的指导作用.
Based on beam propagation theory,the quantitative relation between PSD （ power spectral density） of ＂defects＂ distribution on optics and that of near field intensity was studied. Its validity was discussed on linear medium,nonlinear medium and spatial filter. The results show that PSD of＂defects＂distribution on optics and PSD of near field intensity are connected by a system propagation factor when the modulation is weak,which is determined by system architecture and operation state. These results provide a theoretical basis for specifications of＂defects＂distribution on optics,and also a guidance to enhancing the power of high power solid-state laser system.
出处
《物理学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第2期253-259,共7页
Acta Physica Sinica
基金
国防科技重点实验室基金(批准号:9140C6803010904)资助的课题~~
