基于晶体旋光效应的近场光学空间滤波

 在激光传输与放大系统中，激光束的空间滤波是光束质量控制的重要环节。利用各向同性晶体的旋光性，采用偏振光检偏法选择不同空间频率光束的通过与阻挡，实现激光光束的近场空间滤波。用多个滤波器串接构成滤波器组，可提高光束空间窄带滤波性能。该方法有利于克服激光工程中采用4f滤波带来的空间滤波器体积庞大与抽空耗能的缺点。

Spatial filtering in near field based on rotating and polarizing property of crystal

In transfer and amplification system of laser,spatial filtering is a key to improving the quality of output light.Based on rotation effects of polarized light in an isotropic crystal,the polarized light with spatial variation components might pass through or be cut off by polarization selectivity,spatial filtering of light in near-field is feasible.Furthermore,combined filters can improve narrow-band filtering.The proposed method is able to reduce the system space and energy consumption in the spatial filtering system.