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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 the optical transmission theory, the quantitative relationship between the power spectral density (PSD) of the optical element and the near-field intensity distribution PSD of the optical element under weak modulation is obtained. By means of numerical simulation, The theoretical relationship between the power solid-state laser device and the basic unit (linear medium, nonlinear medium and spatial filter) is verified and discussed in detail.The results show that there are only weak amplitude or phase type defects “Distribution, the PSD of the optical element ” defect “is related to the beam near-field intensity distribution PSD by the system transmission factor of the near-field intensity distribution PSD, and the transmission factor is related to the system configuration and operation state. The research result is that the optical element ”Defects " distribution index provides a theoretical basis for the high power solid-state laser device to enhance the load capacity has played a guiding role.