Abstract
With advantages of high-resolution, high-precise and wide spectral band, grating spectrograph imager was widely applied in aerospace remote field. In this paper, a kind of depolarizer is designed based on Muller matrix in front of the optical system to satisfy the requirement of grating spectrograph. The polarization sensitivity of depolarizer and grating spectrograph (with depolarizer) at 0 Fov, ±0.5 Fov in 4 bands between 0.4–0.95 μm are measured. The polarization measurement model is independent developed to achieve full-aperture testing. Through analyzing, test precision is better 0.5%. All polarization sensitivity results show two-cycle variation as expected. The polarization sensitivity of depolarizer is better than 10%, and that of the whole grating spectrograph is better than 2%. The experimental results are consistent with theoretical analyses. It is validated that the proposed depolarizer has obvious depolarization effect and restrained the polarization sensitivity of grating spectrograph effectively.
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