Optical, Mechanical And Thermal Properties Of Calcium Lanthanum Sulphide Compared With The Properties Of Current 8-12 µm Window Materials

J A Savage; M J Edwards

doi:10.1117/12.948121

17 January 1989 Optical, Mechanical And Thermal Properties Of Calcium Lanthanum Sulphide Compared With The Properties Of Current 8-12 µm Window Materials

J A Savage, M J Edwards

Author Affiliations +

Proceedings Volume 0968, Ceramics and Inorganic Crystals for Optics, Electro-Optics, and Nonlinear Conversion; (1989) https://doi.org/10.1117/12.948121
Event: 32nd Annual International Technical Symposium on Optical and Optoelectronic Applied Science and Engineering, 1988, San Diego, CA, United States

Abstract

The physical property data reported for calcium lanthanum sulphide indicates that it would be an attractive material for high performance 8-12 μm FLIR window applications. However, a number of other available materials may also be considered for aircraft windows operating at temperatures up to 200°C. These are low resistivity germanium (70°C to 100°C), gallium arsenide, multi spectral and standard grade zinc sulphide, zinc sulphide/zinc selenide laminate and zinc selenide. A comparison is presented of the transmittance properties of these materials at room temperature and at 175°C together with room temperature data on the reported optical, mechanical and thermal properties. A qualitative assessment of the likely effectiveness of calcium lanthanum sulphide as a FLIR window material in relation to these existing materials is presented.

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J A Savage and M J Edwards "Optical, Mechanical And Thermal Properties Of Calcium Lanthanum Sulphide Compared With The Properties Of Current 8-12 µm Window Materials", Proc. SPIE 0968, Ceramics and Inorganic Crystals for Optics, Electro-Optics, and Nonlinear Conversion, (17 January 1989); https://doi.org/10.1117/12.948121

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