摘要
为深入研究Lyot改进型退偏器的性能,首次利用多光束叠加方法,分析其退偏性能的偏振相关性。理论分析发现:在楔角足够大的情况下,线偏振光振动方向与入射端晶体光轴夹角,即振动方位角为0°或90°时,退偏效果理想,夹角为45°时一般最差,但当退偏器对入射波长相当于1/4波片时,任意方位角的入射光都有同样好的退偏效果。实验较好验证了理论分析结果,并通过改变入射角使样品的总延迟量达到1/4波片效果,此时退偏度在99%以上。该研究为退偏器的理论分析和设计提供了新的参考依据。
In order to further study on the performance of improved Lyot depolarizer, the method of superposition of multiple beam is proposed to analyse the polarization dependence of depolarizing performance. It is showed by theoretical analysis that the degree of depolarization（D） is ideal when vibration azimuth angle（VAA） of linearly polarized light is 0° or 90° on the basis of large enough wedge angle. In general, the D is the worst when VAA is 45°. However, when the depolarizer is equivalent to a 1/ 4 wave plate for incidence wavelength, the D of any VAA is ideal. The theoretical results are well verified by experiments. The D is over 99% when total retadation is as same as a 1/4 wave plate by changing incidence angle. The study provide a new reference for the theoretical analysis and design of depolarizer.
出处
《光学技术》
CAS
CSCD
北大核心
2013年第1期14-18,共5页
Optical Technique
基金
国家科学基金青年科学基金(11104161)
关键词
光学器件
Lyot改进型退偏器
多光束叠加
1
4波片
optical device
improved Lyot depolarizer
superposition of multiple beam
1/4 wave plate
