Haeun Chung,1,2 A. N. Ramaprakashhttps://orcid.org/0000-0001-5707-4965,3 Pravin Khodade,3 Chaitanya V. Rajarshi,3 Sabyasachi Chattopadhyay,3 Pravin A. Chordia,3 Amitesh Omar,4 Changbom Park5
1Seoul National Univ. (Korea, Republic of) 2Korea Institute for Advanced Study (Korea, Republic of) 3Inter-Univ. Ctr. for Astronomy and Astrophysics (India) 4Aryabhatta Research Institute of Observational Sciences (India) 5Korea Institute for Advanced Study (India)
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We present fore-optics and calibration unit design of Devasthal Optical Telescope Integral Field Spectrograph (DOTIFS). DOTIFS fore-optics is designed to modify the focal ratio of the light and to match its plate scale to the physical size of Integral Field Units (IFUs). The fore-optics also delivers a telecentric beam to the IFUs on the telescope focal plane. There is a calibration unit part of which is combined with the fore-optics to have a light and compact system. We use Xenon-arc lamp as a continuum source and Krypton/Mercury-Neon lamps as wavelength calibration sources. Fore-optics and calibration unit shares two optical lenses to maintain compactness of the overall subsystem. Here we present optical and opto-mechanical design of the calibration unit and fore-optics as well as calibration scheme of DOTIFS.
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Haeun Chung, A. N. Ramaprakash, Pravin Khodade, Chaitanya V. Rajarshi, Sabyasachi Chattopadhyay, Pravin A. Chordia, Amitesh Omar, Changbom Park, "DOTIFS: fore-optics and calibration unit design," Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107027U (9 July 2018); https://doi.org/10.1117/12.2312394