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【答案】应助回帖
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piao_19850: 金币+50, 翻译EPI+1, ★★★★★最佳答案, 非常感谢你 2012-06-26 12:43:30
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the major and minor axis of this ellipse are always in the x,y directions,which are exactly the fast and slow directions of a quarter of wave plate,consequently,emergent light from a quarter of wave plate is linearly polarized light,the included angle between its polarization direction and y axis is 口。Hence，turning analyzer 口 form orthogonal position can minimize the output, this angle is extinction angle,which can be detected by analyzer,birefringence gradient ΔR is calculated by following equation: |
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