Design and Analysis of a Depolarizer for the Space-Borne Grating Imaging Spectrometer
ZHAO Fa-cai1,2, WANG Shu-rong1*, QU Yi1, LIN Guan-yu1
1. Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China 2. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
Abstract：The main portion of the space-borne grating imaging spectrometer-grating has intense polarization response. The objective of spectrometer is to measure the intensity accurately without bias as to the incident polarization state. One common method to overcome polarization bias in optical systems is the insertion of a depolarizer. The theory of horizontal-vertical (H-V) quartz depolarizer operation is described. A single H-V depolarizer was met the spectrometer polarization requirement according to its polarization character. Both the degree of depolarization and image degradation (especially the image doubling) were analyzed for the depolarizer design. The analysis results show that it satisfies the design requirements of the spectrometer, the polarization sensitivity is within the specification of 1% and the decrease in MTF due to the depolarizer is less than 1.5%.
赵发财1,2, 王淑荣1*, 曲 艺1，林冠宇1 . 星载光栅成像光谱仪的退偏器设计与分析[J]. 光谱学与光谱分析, 2011, 31(07): 1991-1994.
ZHAO Fa-cai1,2, WANG Shu-rong1*, QU Yi1, LIN Guan-yu1 . Design and Analysis of a Depolarizer for the Space-Borne Grating Imaging Spectrometer . SPECTROSCOPY AND SPECTRAL ANALYSIS, 2011, 31(07): 1991-1994.
