27 July 2016 The first aluminum coating of the 3700mm primary mirror of the Devasthal Optical Telescope
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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, Krishna Reddy Bheemireddy, Maheswar Gopinathan, Maheswar Gopinathan, Jayshreekar Pant, Jayshreekar Pant, Amitesh Omar, Amitesh Omar, Brijesh Kumar, Brijesh Kumar, Wahab Uddin, Wahab Uddin, Nirmal Kumar, 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); doi: 10.1117/12.2234727; https://doi.org/10.1117/12.2234727
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