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Proceedings Paper

Novel IR Coating Designs With Improved Environmental Durability
Author(s): R. S. Yalamanchi; G. K. M. Thutupalli; K. S. Harshavardhan
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Paper Abstract

Present research indicates that amorphous materials that exist in metastable equilibrium impart environmental ruggedness to multilayered infrared (IR) optical components. This study throws new light on the 'microstructure engineering' of IR optical layers for improved performance. Thin film designs in the IR band were experimentally realized with sputtered Germanium and plasma-deposited amorphous hydrogenated carbon (a-C:H or DLC) as the terminating layers. All the optical components survived very stressing environmental tests like thermal cycling/thermal shock and acid immersion. The grain boundary-free nature together with the inherent chemical inertness of the sealing diamondlike carbon layers imparts the environmental ruggedness to the IR optical components.

Paper Details

Date Published: 11 September 1989
PDF: 4 pages
Proc. SPIE 1112, Window and Dome Technologies and Materials, (11 September 1989); doi: 10.1117/12.960799
Show Author Affiliations
R. S. Yalamanchi, ISRO Satellite Centre (India)
G. K. M. Thutupalli, ISRO Satellite Centre (India)
K. S. Harshavardhan, Indian Institute of Science (India)

Published in SPIE Proceedings Vol. 1112:
Window and Dome Technologies and Materials
Paul Klocek, Editor(s)

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