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| Paper: |
Polarization-Holographic Imaging Stokes Polarimeter for Observational Study of the Sun |
| Volume: |
526, Solar Polarization Workshop 8 |
| Page: |
357 |
| Authors: |
Kvernadze, T.; Kurkhuli, G.; Kilosanidze, B.; Kakauridze, G.; Kulijanishvili, V.; Khutsishvili, E.; Khutsishvili, D. |
| Abstract: |
We present an innovative polarization-holographic imaging Stokes polarimeter based on a
polarization-holographic diffraction element, which enables the complete real
time analysis of the polarization state of the incoming light. An element
decomposes the incoming light into diffraction orders, the intensities of which vary
depending on the polarization state of the light source. After the CCD intensity
measurements of the corresponding points or areas in the diffraction orders, and further
data reduction through the calibration parameters, we get the real-time Stokes images
of the light source, which allows determining the full polarization state of a point
or extended space object in either a narrow or 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 theoretical model of
the relation between measured intensities in different diffraction orders and Stokes
parameters, developed by Kilosanidze & Kakauridze (2007), was used to calibrate the polarimeter. The tests
show that the resulting errors are better than 1%. First polarimetric test images
were obtained for stars and solar spicules. The polarimeter is compact, lightweight,
and could be installed on ground-based, airborne, or space telescopes. |
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