DOTIFS: fore-optics and calibration unit design
Abstract
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.
- Publication:
-
Ground-based and Airborne Instrumentation for Astronomy VII
- Pub Date:
- July 2018
- DOI:
- 10.1117/12.2312394
- arXiv:
- arXiv:1810.03627
- Bibcode:
- 2018SPIE10702E..7UC
- Keywords:
-
- Astrophysics - Instrumentation and Methods for Astrophysics
- E-Print:
- 7 pages, 8 figures, Conference poster at SPIE Astronomical Telescopes + Instrumentation, 2018, Austin, Texas, United States