由四分之一波片和偏振分束立方组成
设计波长：532 nm、633 nm、780 nm、1064 nm、1550 nm
将入射的非偏振或P偏振光变为圆偏振光、椭圆偏振光或线偏振光
405 nm-1600 nm范围内多种设计波长可选
由半波片和偏振分束立方组成
应用：连续改变线偏振光束的透射强度
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