Assessment of low-expansion tungstates for thermal-shock-resistant infrared windows

Daniel C. Harris; Lee Cambrea

doi:10.1117/12.2014815

4 June 2013 Assessment of low-expansion tungstates for thermal-shock-resistant infrared windows

Daniel C. Harris, Lee Cambrea

Proceedings Volume 8708, Window and Dome Technologies and Materials XIII; 870809 (2013) https://doi.org/10.1117/12.2014815
Event: SPIE Defense, Security, and Sensing, 2013, Baltimore, Maryland, United States

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 Al_0.5Sc_1.5(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.

Citation Download Citation

Daniel C. Harris and Lee Cambrea "Assessment of low-expansion tungstates for thermal-shock-resistant infrared windows", Proc. SPIE 8708, Window and Dome Technologies and Materials XIII, 870809 (4 June 2013); https://doi.org/10.1117/12.2014815

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