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.
@article{arxiv.1810.03627,
title = {DOTIFS: fore-optics and calibration unit design},
author = {Haeun Chung and A. N. Ramaprakash and Pravin Khodade and Chaitanya V. Rajarshi and Sabyasachi Chattopadhyay and Pravin A. Chordia and Amitesh Omar and Changbom Park},
journal= {arXiv preprint arXiv:1810.03627},
year = {2018}
}
Comments
7 pages, 8 figures, Conference poster at SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States