Preparation of dielectric highly reflective (HR) mirrors from colloidal oxide suspensions containing organic polymer binders

Ian M. Thomas

doi:10.1117/12.188987

13 October 1994 Preparation of dielectric highly reflective (HR) mirrors from colloidal oxide suspensions containing organic polymer binders

Ian M. Thomas

Author Affiliations +

Proceedings Volume 2288, Sol-Gel Optics III; (1994) https://doi.org/10.1117/12.188987
Event: SPIE's 1994 International Symposium on Optics, Imaging, and Instrumentation, 1994, San Diego, CA, United States

Abstract

Colloidal suspensions of oxides have been used to prepare dielectric HR mirrors, specifically for high power fusion laser applications, on substrates up to 38 cm square using a meniscus coater. These coatings consist of porous quarterwave layers of alternating high and low refractive index oxides. Silica was used exclusively as the low index oxide and AlOOH, ZrO₂ or HfO₂ as the high index material. Coatings were weak because of low particle-to- particle adhesion. The use of organic polymer binders in the high index component in particular, was found to increase strength thereby improving the laser damage threshold and also reducing the number of layers required for 99% reflection due to increase in the refractive index.

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Ian M. Thomas "Preparation of dielectric highly reflective (HR) mirrors from colloidal oxide suspensions containing organic polymer binders", Proc. SPIE 2288, Sol-Gel Optics III, (13 October 1994); https://doi.org/10.1117/12.188987

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