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Proceedings Paper

Polycrystal GaAs infrared windows
Author(s): Hideo Wada; Ken-ichiro Shibata; Masashi Yamashita; Shigeru Nakayama; Akihito Fujii
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Paper Abstract

There are difficult points such as lowering of the detection or recognition capability of some targets by aerodynamic heating with speedup of the aircraft and missile and restriction of the operation by the raindrop in rainfall time on the conventional ZnS infrared window application used for missile seeker and FLIR equipment. Therefore, in this study, the promising polycrystal GaAs which has low infrared radiations in high temperature was produced using HB method (Horizontal Boat method) and VG method (Vertical Boat method) as a new infrared window material expected the durability for rain erosion. As the result, 70mm2 windows by the HB method and 100mm diameter windows by VB method were realized. Moreover, their optical characteristics, mechanical properties and thermal shock durabilities were measured and they were confirmed to be about 56% in average transmittance in the wavelength of 10micrometers bands, 530~630kg/mm2 in their hardness and thermostable at 300 degree(s)C.

Paper Details

Date Published: 7 September 2001
PDF: 11 pages
Proc. SPIE 4375, Window and Dome Technologies and Materials VII, (7 September 2001); doi: 10.1117/12.439196
Show Author Affiliations
Hideo Wada, Japan Defense Agency (Japan)
Ken-ichiro Shibata, Sumitomo Electric Industries, Ltd. (Japan)
Masashi Yamashita, Sumitomo Electric Industries, Ltd. (Japan)
Shigeru Nakayama, Sumitomo Electric Industries, Ltd. (Japan)
Akihito Fujii, Sumitomo Electric Industries, Ltd. (Japan)

Published in SPIE Proceedings Vol. 4375:
Window and Dome Technologies and Materials VII
Randal W. Tustison, Editor(s)

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