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Proceedings Paper

Assessment of low-expansion tungstates for thermal-shock-resistant infrared windows
Author(s): Daniel C. Harris; Lee Cambrea
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Paper Abstract

Low-thermal-expansion tungstate materials have the potential to be used as thermalshock- resistant midwave (3-5 μm) infrared windows. Material properties that favor thermal shock resistance are high strength, high thermal conductivity, low elastic modulus, and low thermal expansion. Sapphire, for example, owes its high thermal shock resistance to high strength and high thermal conductivity. In principle, it is possible to obtain even higher thermal shock resistance if a window material with near-zero thermal expansion can be made. This paper assesses recent work on Zr(WO4)2 and Al0.5Sc1.5(WO4)3. It is concluded that multi-phonon absorption in the midwave spectral region limits the optical capabilities of tungstate materials. These materials have more absorption—and therefore, more emission—than aluminum oxynitride in the 4-5 μm wavelength region.

Paper Details

Date Published: 4 June 2013
PDF: 14 pages
Proc. SPIE 8708, Window and Dome Technologies and Materials XIII, 870809 (4 June 2013); doi: 10.1117/12.2014815
Show Author Affiliations
Daniel C. Harris, Naval Air Systems Command (United States)
Lee Cambrea, Naval Air Systems Command (United States)


Published in SPIE Proceedings Vol. 8708:
Window and Dome Technologies and Materials XIII
Randal W. Tustison; Brian J. Zelinski, Editor(s)

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