Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7455
Title: The estimation of the instrumental polarization and crosstalk at the focus of the mid-infrared imaging system for the Thirty Meter Telescope
Authors: Ramya, M. Anche
Packham, Chris
Anupama, G. C
Sankarasubramanian, K
Maheswar, G
Manoj, P
Keywords: Instrumental polarization;Crosstalk;Thirty-Meter Telescope;MICHI;MIRAO
Issue Date: Jul-2018
Publisher: SPIE--The International Society for Optical Engineering
Citation: Proceedings of the SPIE, Vol.10702, pp. 1070298-1- 1070298-9
Abstract: The Thirty Meter Telescope (TMT) is a proposed future generation telescope which will be located on either Maunakea, Hawaii or La Palma in the Canary islands. A thermal-infrared (TIR) imager and spectrometer (MICHI) combined with an adaptive optics system is being investigated as a possible second-generation instrument for this telescope. MICHI has been designed to also have a polarimetry capability in both imaging and low dispersion spectroscopic modes. Using polarization ray tracing in Zemax, we have estimated the instrumental polarization (IP) and crosstalk introduced at the focus of the near- and mid-infrared imaging system. In our calculations, we find that the IP varies from 1.0-0.54% and 0.54-0.42%, whereas the polarization crosstalk varies between 25-4% and 4-0.7%, in the near and TIR regions respectively at the instrument port of MICHI. These values of IP and crosstalk may cause problems during the high absolute accuracy polarization observations. Here we present the polarization effects for the imaging system of MICHI and it impacts on the polarization observations.
Description: Restricted Access
URI: http://hdl.handle.net/2248/7455
ISSN: 1996-756X
???metadata.dc.rights???: © SPIE--The International Society for Optical Engineering
???metadata.dc.relation.uri???: https://doi.org/10.1117/12.2312558
Appears in Collections:IIAP Publications



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