ABSTRACT Expanding operational spectral bandwidth is a significant challenge in full‐Stokes polarimetric imaging. Most existing methods are either wavelength‐limited or suffer from time‐consuming, complex calibration procedures across different spectra. In this work, we propose a parallel uncoupled spatial frequency modulation structure for multi‐wavelength compatible, single‐shot full‐Stokes imaging. This is achieved by integrating a 2D orthogonal Ronchi grating and a custom uncoupled polarization mask into the 4F optical system, encoding four polarization components ( I 0 , I 90 , I 135 , and I LCP ) into a single‐shot intensity image. They can be efficiently decoded via the fast Fourier transform. And then full‐Stokes vector images ( S 0 , S 1 , S 2, and S 3 ) can be further obtained. The primary advantages are the bypass of conventional system‐level polarization measurement matrix calibration and its cost‐effectiveness. Our method enables simple calibration of the full‐Stokes response at each wavelength, requiring only a one‐time pre‐calibration of the mask's single‐point Stokes response. Experimental results demonstrate high reliability: four targets of varying polarization complexities are tested; linear polarization reconstruction errors are 0.26% ( S 1 ) and 0.45% ( S 2 ), and S 3 reconstruction errors are 1.25% (532 nm) and 0.83% (633 nm). With its concise forward model and simple modulation mask, this structure is highly reproducible and readily implementable for robust polarimetric imaging.
Lin et al. (Thu,) studied this question.