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24 May 2018 Design and calibration for a Full-Stokes imaging polarimeter.
Iván Montes González, Neil C. Bruce
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Proceedings Volume 10677, Unconventional Optical Imaging; 106772M (2018) https://doi.org/10.1117/12.2306477
Event: SPIE Photonics Europe, 2018, Strasbourg, France
Abstract
The design and construction of a Full-Stokes Imaging polarimeter is presented. The device uses a telescope optical system and a polarization state analyzer (PSA) to obtain polarimetric images on a CCD. The PSA employs two liquid crystal variable retarders (LCVR) and a linear polarizer to measure the four Stokes parameters. The Stokes polarimetry method used in this paper is based on the application of six combinations of retardance values on the LCVRs. A well-known method is used to extract all the Stokes vector parameters from this intensity data. Due to experimental errors, a calibration is necessary. The calibration method used in this paper, also calculates the errors in the experimental set-up by fitting the experimental intensity measurements for the calibration samples to a theoretical polarimeter with errors. In this case, we used incident 45° polarized light to control the output polarization, and six calibration samples. The errors calculated in the method include the axes alignment errors and the errors in the retardance values of both LCVRs. The acquisition of Stokes images used a telescope optical system with a CCD camera.
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Iván Montes González and Neil C. Bruce "Design and calibration for a Full-Stokes imaging polarimeter.", Proc. SPIE 10677, Unconventional Optical Imaging, 106772M (24 May 2018); https://doi.org/10.1117/12.2306477
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KEYWORDS
Calibration
Polarimetry
Polarization
Polarizers
Wave plates
Liquid crystals
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