Development of a snapshot image mapping spectropolarimeter

Snapshot imaging spectropolarimeters (ISPs) have been widely applied in the field of target detection due to their capability for real-time data acquisition. In this paper, we propose a snapshot image mapping spectropolarimeter (IMSP) based on a broadband liquid crystal polarization grating (LCPG). The system features a compact and concise optical design that enables the simultaneous acquisition of both spectral and polarization information represented by Stokes vector within a single exposure. The IMSP offers 20 spectral channels, covering a spectral range from 450 nm to 850 nm, and is capable of simultaneously measuring the $s_0$ and $s_1$ components of the Stokes vector. This paper presents experimental tests conducted using the IMSP system to evaluate its spectropolarimetric imaging capabilities, and provides the associated experimental results. Furthermore, a rapid calibration and image reconstruction method tailored for IMSP is developed, which effectively corrects spatial and spectral distortions while enhancing overall image quality.