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Proceedings Paper

The first aluminum coating of the 3700mm primary mirror of the Devasthal Optical Telescope
Author(s): Krishna Reddy Bheemireddy; Maheswar Gopinathan; Jayshreekar Pant; Amitesh Omar; Brijesh Kumar; Wahab Uddin; Nirmal Kumar
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Paper Abstract

Initially the primary mirror of the 3.6m Devasthal Optical Telescope is uncoated polished zerodur glass supplied by Lytkarino Optical Glass Factory, Russia/Advanced Mechanical and Optical Systems, Belgium. In order to do the aluminium coating on the primary mirror the coating plant including washing unit is installed near the telescope (extension building of telescope) by Hind High Vacuum (HHV) Bangalore, India. Magnetron sputtering technique is used for the coating. Several coating trials are done before the primary mirror coating; samples are tested for reflectivity, uniformity, adhesivity and finally commissioned. The primary mirror is cleaned, coated by ARIES. We present here a brief description of the coating plant installation, Mirror cleaning and coating procedures and the testing results of the samples.

Paper Details

Date Published: 27 July 2016
PDF: 9 pages
Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 990644 (27 July 2016); doi: 10.1117/12.2234727
Show Author Affiliations
Krishna Reddy Bheemireddy, Aryabhatta Research Institute of Observational Sciences (India)
Maheswar Gopinathan, Aryabhatta Research Institute of Observational Sciences (India)
Jayshreekar Pant, Aryabhatta Research Institute of Observational Sciences (India)
Amitesh Omar, Aryabhatta Research Institute of Observational Sciences (India)
Brijesh Kumar, Aryabhatta Research Institute of Observational Sciences (India)
Wahab Uddin, Aryabhatta Research Institute of Observational Sciences (India)
Nirmal Kumar, Indian Institute of Astrophysics (India)


Published in SPIE Proceedings Vol. 9906:
Ground-based and Airborne Telescopes VI
Helen J. Hall; Roberto Gilmozzi; Heather K. Marshall, Editor(s)

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