Interferometric Imaging Spectropolarimeter Using Dual-Channel Lateral Shearing Beam Splitter
(2.MIIT Key Laboratory of Advanced Solid Laser, Nanjing University of Science and Technology, Nanjing, Jiangsu, China 210094)
(3.Nanjing Institute of Astronomical Optics & Technology, National Astronomical Observatories, Chinese Academy of Sciences, Nanjing, Jiangsu, China 210042)
【Abstract】Imaging spectropolarimeter can concurrently obtain the spatial information, spectral characteristics and polarization information of the target, it is a well-recognized technique and widely used in scientific applications, such as astrophysics, detection of atmospheric composition, biomedicine and other areas. The polarization information is generally acquired with the tradeoff of the decrease of the spectral imaging spatial resolution in imaging spectropolarimeters. An interferometric imaging spectropolarimeter using dual-channel lateral shearing beam splitter is proposed to avoid the decrease of spatial resolution. A dual-rectangle lateral shearing beam splitter is used in imaging spectropolarimeter, which makes it a dual-channel imaging spectropolarimeter. The two channels are used for high spatial resolution interferometric imaging and polarization spectral imaging based on micro-polarization array, respectively. The principle of the dual-rectangle lateral shearing beam splitter and the Fourier transform polarization spectral imaging based on micro-polarization array modulation are analyzed. The spectrum recovery method and extraction mode of polarization information are discussed. High spatial resolution spectral images and polarization images of a scene in the visible region are acquired by the experimental apparatus, which proves that the proposed imaging spectropolarimeter can concurrently be used for polarization imaging measurement and high spatial resolution spectral imaging measurement.
【Keywords】 imaging systems; interferometric imaging; polarimetric imaging; dual-channel lateral shearing; micro-polarization array;
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