Astropolarimetry with a polarization-holographic imaging Stokes polarimeter

Kakauridze, George; Kilosanidze, Barbara; Kvernadze, Teimuraz; Kurkhuli, Georgi

doi:10.1117/1.jatis.5.1.015002

Cited by 1 publication

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“…Based on such element we have developed the Polarization-Holographic Imaging Stokes Spectro-Polarimeter (PHISSP) for astronomy to determine an instant polarization state of a point source object and the distribution of a polarization on an extended objects image for different spectral ranges. [21][22][23] A schematic picture of diffraction on the polarizationholographic element, a photo of the PHISSP and its principal schema are shown on The input part of the polarimeter is equipped with two controllable apertures of variable size, the width of which varies from 0 to 3 mm. Thus, through them, it is possible to obtain a combined aperture in the form of a rectangular aperture (height up to 3 mm and a width of up to 0.01 mm), as well as in a square form up to 3 x 3 mm in size.…”

Section: Polarization-holographic Stokes Imaging Astropolarimetermentioning

confidence: 99%

Application of the polarization-holographic imaging Stokes spectropolarimeter in astronomy

Kilosanidze,

Kakauridze,

Chaganava

et al. 2023

Astronomical Optics: Design, Manufacture, and Test of Space and Ground Systems IV

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An innovative polarization-holographic imaging Stokes spectropolarimeter is presented. The main analyzing unit of such a polarimeter is the integral polarization-holographic diffraction element, which enables the complete analysis of the polarization state of incoming light to be carried out in real-time. It decomposes the incoming light into diffraction orders, the intensities of which vary depending on the polarization state of the light source. After the simultaneous diffraction order intensity measurements of the corresponding points or areas in the diffraction orders, we get the realtime Stokes images of the light source, which allows determining the entire polarization state of a point or extended space object for different spectral regions and variable polarization. A working aperture can be from 0.5 cm up to 5 cm in diameter. The results of studies on improving the stability and diffraction efficiency of the element are presented. Measurements of the polarization state by the standard star were carried out to calibrate the spectropolarimeter. Polarimetric measurements of some astronomical objects have been carried out. The resulting errors are better than 10 -2 . The polarization-holographic imaging Stokes spectropolarimeter has no mechanically moving or electrically tunable optical elements, has no internal reflections, and is universal, compact, cost-effective, and lightweight.

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Section: Polarization-holographic Stokes Imaging Astropolarimetermentioning

confidence: 99%