Snapshot miniature optically replicating and remapping imaging spectropolarimeter (MINI-ORRISp): Design, calibration and performance

A high-performance snapshot Miniature Optically Replicating and Remapping Imaging Spectropolarimeter (MINI-ORRISp) for the acquisition of 3D data cubes (x, y, λ) for each of four Stokes parameters (S₀, S₁, S₂, S₃) is developed. It uses the simplest passive polarization modulator (PM) consisting of only a single multi-order retarder followed by a linear polarizer to encode the 3D data cubes into our single-2D-detector-based snapshot imaging spectrometer, and employs an untrained-network-based self-calibrating reconstruction algorithm to decode the data cubes. The developed MINI-ORRISp prototype provides video-rate acquisition of 3D data cubes (400 × 400 × 72) for each Stokes parameter over a wide spectral range of 400–850 nm. The portable prototype has a miniature size of 60 × 66 × 53 mm³ and a light weight of 410 g. Essential details of the opto-mechanical design as well as the calibration and performance characterization are presented. Extensive experimental results are provided to demonstrate the ability of the MINI-ORRISp to obtain high-quality spectropolarimetric images from both static and dynamic scenes.