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Proceedings Paper

Low-loss spinel windows for high-energy lasers
Author(s): Woohong Kim; Colin Baker; Guillermo Villalobos; Shyam Bayya; Michael Hunt; Bryan Sadowski; Ishwar Aggarwal; Jasbinder Sanghera
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Paper Abstract

Ideal exit aperture windows for high-energy laser (HEL) should possess low absorption and scattering losses and be environmentally rugged and strong in order to protect the laser gain medium without compromising the light propagating through the window. Spinel is an ideal candidate for this application due to its high mechanical strength, high thermal conductivity, and excellent optical transmission between 0.2~5 μm. However, spinel ceramics fabricated with commercial powders often show inhomogeneity and suffer from absorption and scattering caused by various types of intrinsic and extrinsic impurities present in the powders. Here, we report on a convenient and economical powder purification method to significantly lower the absorption loss of transparent spinel ceramics using commercial powders. Acid washing was successfully used to reduce absorption loss in spinel ceramic fabricated using commercial powder from >20,000 ppm/cm down to 75 ppm/cm.

Paper Details

Date Published: 22 May 2015
PDF: 6 pages
Proc. SPIE 9453, Window and Dome Technologies and Materials XIV, 945303 (22 May 2015); doi: 10.1117/12.2176378
Show Author Affiliations
Woohong Kim, U.S. Naval Research Lab. (United States)
Colin Baker, U.S. Naval Research Lab. (United States)
Guillermo Villalobos, U.S. Naval Research Lab. (United States)
Shyam Bayya, U.S. Naval Research Lab. (United States)
Michael Hunt, Univ. Research Foundation (United States)
Bryan Sadowski, Sotera Defense Solutions, Inc. (United States)
Ishwar Aggarwal, Sotera Defense Solutions, Inc. (United States)
Jasbinder Sanghera, U.S. Naval Research Lab. (United States)


Published in SPIE Proceedings Vol. 9453:
Window and Dome Technologies and Materials XIV
Brian J. Zelinski; Randal W. Tustison, Editor(s)

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