Effect of crystal dichroism on the capability of wave-plates
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摘要: 为了更好地在晶体具有二向色性的波段使用波片,采用矩阵光学的方法,分析了晶体的二向色性对λ/4波片产生圆偏光、λ/2波片使偏振面产生旋转以及出射光振幅的影响,当线偏光光矢量与波片快轴成45°入射时,由于晶体的二向吸收,通过波片后的光不是圆偏光而是椭偏光,只有在满足条件时才能得到圆偏光,而且振幅变小;对于波片,考虑二向吸收后,线偏光光矢量的旋转不再是入射光矢量与波片快轴夹角的2倍关系,光矢量的旋转角度和振幅的变化是二向吸收系数及入射光矢量与晶体光轴夹角的函数。结果表明,晶体的二向色性对波片性能的影响是不容忽视的,在器件使用中应该引起人们的注意。Abstract: In order to use the wave-plate better within the band with crystal dichroism,the effect of the dichroism on the circular polarized light induced by a λ/4 wave-plate, the plane of polarization rotated by a λ/2 wave-plate and the output amplitude was analyzed respectively based on matrix optics.Because of dichroic absorption of the crystal, the transmitted ray becomes elliptical polarized light instead of circular polarized light when the optical vector of the linear polarized light inputs at 45° with respect to the fast axis of the λ/4 wave-plate.For a λ/4 wave-plate,only when tan θ=exp(-△ad), the transmitted ray is circular polarized light with lower amplitude.As to a λ/2 wave-plate,with dichroism taken into account,the rotation angle of the optical vector of the linear polarized light is not twice as the angle between the optical vector of the incident light and the fast axis of the wave-plate.The rotation angle and amplitude are the function of the dichroic absorption coefficient and the angle between the vector of the incident light and the optical axis of the crystal.The results show that the crystal dichroism of the wave-plate cannot be ignored,it should be paid more attention.
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