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Analysis of polarization introduced due to the telescope optics of the Thirty Meter Telescope

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dc.contributor.author Ramya, M. Anche
dc.contributor.author Sen, A
dc.contributor.author Anupama, G. C
dc.contributor.author Sankarasubramanian, K
dc.contributor.author Skidmore, W
dc.date.accessioned 2020-11-10T13:33:36Z
dc.date.available 2020-11-10T13:33:36Z
dc.date.issued 2018-01
dc.identifier.citation Journal of Astronomical Telescopes, Instruments, and Systems, Vol. 4, No. 1, pp. 018003-1 - 018003-16 en_US
dc.identifier.issn 2329-4221
dc.identifier.uri http://prints.iiap.res.in/handle/2248/6774
dc.description Restricted Access © SPIE--The International Society for Optical Engineering; https://doi.org/10.1117/1.JATIS.4.1.018003 en_US
dc.description.abstract An analytical model has been developed to estimate the polarization effects, such as instrumental polarization (IP), crosstalk (CT), and depolarization, due to the optics of the Thirty Meter Telescope. These are estimated for the unvignetted field-of-view and the wavelengths of interest. The model estimates an IP of 1.26% and a CT of 44% at the Nasmyth focus of the telescope at the wavelength of 0.6  μm at field angle zero with the telescope pointing to zenith. Mueller matrices have been estimated for the primary, secondary, and Nasmyth mirrors. It is found that some of the Mueller matrix elements of the primary and secondary mirrors show a fourfold azimuthal antisymmetry, which indicates that the polarization at the Cassegrain focus is negligible. At the inclined Nasmyth mirror, there is no azimuthal antisymmetry in the matrix elements, and this results in nonzero values for IP and CT, which would negatively impact the polarization measurements at the telescope focus. The averaged Mueller matrix is estimated at the Nasmyth focus at different instrument ports and various zenith angles of the telescope. The variation in the Mueller matrix elements for different coatings is also estimated. The impact of this polarization effect on the science case requirements has been discussed. This analysis will help in achieving precise requirements for future instruments with polarimetric capability. en_US
dc.language.iso en en_US
dc.publisher SPIE-The International Society for Optical Engineering en_US
dc.subject Instrumental polarization en_US
dc.subject Crosstalk en_US
dc.subject Ray tracing en_US
dc.subject Analytical method en_US
dc.subject Mueller matrix en_US
dc.subject Thirty Meter Telescope en_US
dc.title Analysis of polarization introduced due to the telescope optics of the Thirty Meter Telescope en_US
dc.type Article en_US

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