The first aluminum coating  of the 3700mm primary mirror of the Devasthal Optical Telescope

Krishna Reddy Bheemireddy; Maheswar Gopinathan; Jayshreekar Pant; Amitesh Omar; Brijesh Kumar; Wahab Uddin; Nirmal Kumar

doi:10.1117/12.2234727

27 July 2016 The first aluminum coating of the 3700mm primary mirror of the Devasthal Optical Telescope

Krishna Reddy Bheemireddy, Maheswar Gopinathan, Jayshreekar Pant, Amitesh Omar, Brijesh Kumar, Wahab Uddin, Nirmal Kumar

Author Affiliations +

Proceedings Volume 9906, Ground-based and Airborne Telescopes VI; 990644 (2016) https://doi.org/10.1117/12.2234727
Event: SPIE Astronomical Telescopes + Instrumentation, 2016, Edinburgh, United Kingdom

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.

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Krishna Reddy Bheemireddy, Maheswar Gopinathan, Jayshreekar Pant, Amitesh Omar, Brijesh Kumar, Wahab Uddin, and Nirmal Kumar "The first aluminum coating of the 3700mm primary mirror of the Devasthal Optical Telescope", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 990644 (27 July 2016); https://doi.org/10.1117/12.2234727

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