红外与激光工程, 2020, 49 (7): 20190544, 网络出版: 2020-08-19  

应用于光栅光谱仪的消偏器研究 下载: 572次

Study on depolarizers applied for a grating spectrometer
作者单位
北京空间机电研究所,北京 100094
摘要
光栅光谱仪的像质会受到入射光偏振特性的影响,为解决这一问题,通常在系统中加入消偏器来减小仪器的偏振响应。晶体材料的双折射特性在光学原理上可产生消偏效果,常被用来加工成各种类型的消偏器。基于矩阵光学原理对H-V消偏器及双巴比涅消偏器的Muller矩阵及残余偏振度理论表达式做了分析,给出了残余偏振度与工作波长、消偏器楔角、入射光瞳面积及入射光偏振角等参量之间的关系,在此基础上研制了一款应用于某光栅光谱仪的双巴比涅消偏器,经过计算,当楔角0.6°,入射光瞳直径20.6 mm时,双巴比涅消偏器在0.4 ~0.9 μm波长范围内残余偏振度优于3%,并且像分离满足使用要求,具有很强的工程实践性。
Abstract
The image quality of the grating spectrometer is often affected by the polarization characteristics of the incident light. In order to solve this problem, a depolarizer is usually added to the spectrometer to reduce the polarization response of the instrument. The birefringence property of the crystalline material can produce a depolarization effect on the optical principle, therefore it is often used to process into various types of depolarizers. Based on the principle of the matrix optics, the Muller matrix and residual polarization theoretical expression of a H-V depolarizer and a double Barbinet depolarizer were deeply discussed. The relationship among residual polarization of a double Barbinet depolarizer and working wavelength, its wedge angle, entrance pupil diameter and incident light polarization angle was given respectively. Based on these theories, a double Barbinet depolarizer applied for a grating spectrometer was developed. It could be obtained by calculation that when the wedge angle and the pupil diameter of the double Barbinet depolarizer was 0.6° and 20.6 mm respectively, the residual polarization of the depolarizer was better than 3% in the wavelength range of 0.4-0.9 μm. What’s more, the double image distance met the application requirements, so it can be widely used in engineering practice.

谈婷, 吴同舟. 应用于光栅光谱仪的消偏器研究[J]. 红外与激光工程, 2020, 49(7): 20190544. Ting Tan, Tongzhou Wu. Study on depolarizers applied for a grating spectrometer[J]. Infrared and Laser Engineering, 2020, 49(7): 20190544.

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