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Proceedings Paper

Innovative polarization-holographic imaging Stokes spectropolarimeter for astronomy
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Paper Abstract

An innovative real-time imaging Stokes spectropolarimeter is presented. The main unit of the polarimeter is an integral polarization-holographic diffraction element, which enables the complete analysis of the polarization state of light to be carried out in real time. An element is recorded by a special holographic schema using circularly and linearly polarized beams. As a result it decomposes an incoming light into orthogonal circular and linear diffraction orders. Upon simultaneous CCD intensity measurements of the corresponding points or areas in the diffraction orders and further data reduction through the calibration parameters we get real-time Stokes images of a light source. The further reduction of Stokes images allows to determine detailed polarization state of a light coming from a point or extended space object in a narrow or a wide spectral range. The operating spectral range of the polarimeter is 500-1600 nm with diffraction efficiency equal to 20% at 532 nm, 16% at 635 nm and 2% at 1550 nm. The laboratory calibration tests were obtained with a quasi-monochromatic point size depolarized light source which further were circularly or linearly polarized with known polarization parameters and a degree of polarization near to 100%. The theoretical model of relations between measured intensities in different diffraction orders and Stokes parameters, earlier developed by the authors (Kilosanidze B., Kakauridze G. SPIE Proceedings, vol. 8082-126, 2011), were used to calibrate the polarimeter. The laboratory tests show that the resulting errors for single measure are near of 10-2 or less.

Paper Details

Date Published: 20 February 2017
PDF: 10 pages
Proc. SPIE 10110, Photonic Instrumentation Engineering IV, 101100S (20 February 2017); doi: 10.1117/12.2253749
Show Author Affiliations
Barbara Kilosanidze, Georgian Technical Univ. (Georgia)
George Kakauridze, Georgian Technical Univ. (Georgia)
Teimuraz Kvernadze, Abastumani Astrophysical Observatory (Georgia)
Ilia State Univ. (Georgia)
Georgi Kurkhuli, Abastumani Astrophysical Observatory (Georgia)
Ilia State Univ. (Georgia)

Published in SPIE Proceedings Vol. 10110:
Photonic Instrumentation Engineering IV
Yakov G. Soskind; Craig Olson, Editor(s)

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