Design and simulation analysis of the AOTF full-Stokes imaging spectropolarimeter

Chang, Lingying; Xi, Peng; Qiu, Yuehong; Wang, Yitian; Wang, Guanru; Wang, Xinyou

doi:10.1364/josaa.461961

Cited by 2 publications

(1 citation statement)

References 19 publications

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“…They have played a significant role in pathology diagnosis, identification of camouflaged targets and missile guidance in the military, earth resource survey, crop pest survey, flood disaster monitoring, marine resource development, environmental monitoring, atmospheric sounding, astronomical observation, etc. [1] .…”

Section: Introductionmentioning

confidence: 99%

LCVR-based Stokes polarimeter: principles and evaluation

Chang,

Wang,

Wang

et al. 2023

Third International Computing Imaging Conference (CITA 2023)

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The polarimetric imaging system can acquire not only the target's two-dimensional light intensity distribution information but also the Stokes polarization vector information corresponding to the target light intensity distribution. The Stokes vector information can enhance the target's contrast, highlighting the target from the complex background information. The LCVR-based Stokes polarimeter uses a Liquid Crystal Variable Retardation (LCVR) instead of the rotating waveplate in conventional measurement techniques, which enables polarization measurements without moving parts. This paper first introduces the measurement principle of the Stokes vector method, the working principle of LCVR, and the parameters of commonly used evaluation indicators in polarimetric measurement systems. Then, a two-channel single LCVR-type polarimeter measurement scheme is proposed, which uses a split beam element (prism PBS, Savart plate, or Wollaston prism) and a single LCVR to obtain the full Stokes parameters of the target. Then the measurement matrix and light intensity calculation formulas for the polarimeter and polarization spectrometer were derived, and the evaluation parameters of the system (CN, RAD, EWV) were calculated. The study and evaluation analysis provide some theoretical references for studying the LCVR-based Stokes polarimeter.

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Section: Introductionmentioning

confidence: 99%

LCVR-based Stokes polarimeter: principles and evaluation

Chang,

Wang,

Wang

et al. 2023

Third International Computing Imaging Conference (CITA 2023)

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Optimization of polarization parameters for an LCVR polarization spectrometer under non-oversampling

Chang¹,

Wang²,

Wang³

et al. 2023

Appl. Opt.

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The spectral polarization measurement can obtain not only the spectral information of the target but also its polarization information, which can improve the detection and identification of the measured target. In the polarization spectrometer based on a liquid crystal variable retarder (LCVR) and acousto-optic tunable filter (AOTF), the LCVR is a core device for achieving fast and high-precision polarization detection. The AOTF is a new, to the best of our knowledge, filter device for spectral tuning. To reduce the sensitivity of an LCVR-based Stokes polarization spectrometer system to errors and Gaussian noise, and to maintain the advantage of fast electrical tuning of the system for spectral polarization detection, the phase retardation and azimuth angle of the polarization device LCVR is calculated and analyzed optimally under the minimum number of samples N=4 of the Stokes vector measurement method in this paper. The optimization algorithm considers the constraints, such as the number of types of LCVR phase retardation and the number of adjustments, and the azimuth and phase retardation to be optimized are searched for optimality step by step. The simulation results show that the number of adjustments of the phase retardation δ of LCVRs is only three times when four Stokes parameters are obtained. The LCVRs’ number of species is four kinds (2×2). The condition number of the optimized measurement matrix is 1.742, which converges to the ideal condition number, the optimal azimuth angle (θ1,θ2) is (18.9°, 41.9°), and the optimal phase retardation δ is (179.9°, 156.6°, 0.4°, 46.3°). Its corresponding tetrahedral volume is closer to the ideal value. The optimized system is less sensitive to errors and Gaussian noise.

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Design and simulation analysis of the AOTF full-Stokes imaging spectropolarimeter

Cited by 2 publications

References 19 publications

LCVR-based Stokes polarimeter: principles and evaluation

LCVR-based Stokes polarimeter: principles and evaluation

Optimization of polarization parameters for an LCVR polarization spectrometer under non-oversampling

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