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Proceedings Paper

Figures of merit for high-energy laser-window materials: thermal lensing and thermal stresses
Author(s): Claude A. Klein
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Paper Abstract

The selection of a suitable laser-window material involves considerations relating to "thermal lensing," that is, the process of beam distrotion caused by thermally induced phase-aberrations, in addition to issues relating to the stress field generated by beam-induced temperature gradients. The purpose of this paper is to obtain improved figures of merit (FoM) for ranking high-energy laser-window materials in regard to thermal lensing and thermal stresses. We address this task in the following manner: (a) We provide proper analytical expressions for describing how beam-induced optical distortions and beam-induced hoop stresses control the allowable beam fluence; (b) We re-evaluate the role of axial stresses, which may lead to failure through compressive yielding or thermal shock, and derive appropriate FoMs based on allowable irradiances; (c) We illustrate the procedure through FoM evaluations of six window-material candidates for operation at the chemical oxygen-iodine laser wavelength (1.315 µm). This methodology confirms that low-absorption, impurity-free fused silica is the window material of choice for contemplated high-energy laser systems operating in the near-infrared.

Paper Details

Date Published: 15 January 2007
PDF: 16 pages
Proc. SPIE 6403, Laser-Induced Damage in Optical Materials: 2006, 640308 (15 January 2007); doi: 10.1117/12.695638
Show Author Affiliations
Claude A. Klein, c.a.k. analytics (United States)

Published in SPIE Proceedings Vol. 6403:
Laser-Induced Damage in Optical Materials: 2006
Gregory J. Exarhos; Arthur H. Guenther; Keith L. Lewis; Detlev Ristau; M. J. Soileau; Christopher J. Stolz, Editor(s)

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