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9 July 2018 DOTIFS: fore-optics and calibration unit design
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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, and Changbom Park "DOTIFS: fore-optics and calibration unit design", Proc. SPIE 10702, Ground-based and Airborne Instrumentation for Astronomy VII, 107027U (9 July 2018);

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