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DOI: 10.17586/1023-5086-2018-85-10-50-55
Optical compensation of the Chinese Large Solar Telescope instrumental polarization
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Publication in Journal of Optical Technology
Yao B. X., N. Gu T., Rao C. H. Optical compensation of the Chinese Large Solar Telescope instrumental polarization (Оптическая компенсация инструментальной поляризации в Большом китайском солнечном телескопе (Chinese Large Solar Telescope)) [на англ. яз.] // Оптический журнал. 2018. Т. 85. № 10. С. 50–55. http://doi.org/10.17586/1023-5086-2018-85-10-50-55
Yao B. X., N. Gu T., Rao C. H. Optical compensation of the Chinese Large Solar Telescope instrumental polarization (Оптическая компенсация инструментальной поляризации в Большом китайском солнечном телескопе (Chinese Large Solar Telescope)) [in English] // Opticheskii Zhurnal. 2018. V. 85. № 10. P. 50–55. http://doi.org/10.17586/1023-5086-2018-85-10-50-55
B. X. Yao, N. T. Gu, and C. H. Rao, "Optical compensation of the Chinese Large Solar Telescope instrumental polarization," Journal of Optical Technology. 85(10), 639-643 (2018). https://doi.org/10.1364/JOT.85.000639
One of the main tasks for the Chinese Large Solar Telescope (CLST) is to measure the solar polarization with a high accuracy and sensitivity. However, as a classic Gregorian configuration telescope with an altazimuth mount, the telescope system itself will introduce instrumental polarization. Even though there will be a calibration unit on the second focus, it is still hard to calibrate the instrumental polarization all the time because it will change constantly with the rotating of the telescope. In this paper, we proposed a project to compensate the CLST instrumental polarization with an optical compensator. This compensator which consist of seven flat mirrors can compensate the CLST instrumental polarization for any spectral lines in theory. When the polarimetry is not working, it can be removed from the system. We simulated the project using the software called Advanced System Analysis Program (ASAP). And the result showed that this unit can compensate the instrumental polarization completely without considering the post focal instruments.
Chinese Large Solar Telescope (CLST), instrumental polarization, optical compensation, Muller matrix
OCIS codes: 350.1270, 120.5410, 120.0120, 230.3990
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