Novel IR Coating Designs With Improved Environmental Durability

R. S. Yalamanchi; G. K. M. Thutupalli; K. S. Harshavardhan

doi:10.1117/12.960799

11 September 1989 Novel IR Coating Designs With Improved Environmental Durability

R. S. Yalamanchi, G. K. M. Thutupalli, K. S. Harshavardhan

Proceedings Volume 1112, Window and Dome Technologies and Materials; (1989) https://doi.org/10.1117/12.960799
Event: SPIE 1989 Technical Symposium on Aerospace Sensing, 1989, Orlando, FL, United States

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.

Citation Download Citation

R. S. Yalamanchi, G. K. M. Thutupalli, and K. S. Harshavardhan "Novel IR Coating Designs With Improved Environmental Durability", Proc. SPIE 1112, Window and Dome Technologies and Materials, (11 September 1989); https://doi.org/10.1117/12.960799

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