Polycrystal GaAs infrared windows

Hideo Wada; Ken-ichiro Shibata; Masashi Yamashita; Shigeru Nakayama; Akihito Fujii

doi:10.1117/12.439196

7 September 2001 Polycrystal GaAs infrared windows

Hideo Wada, Ken-ichiro Shibata, Masashi Yamashita, Shigeru Nakayama, Akihito Fujii

Proceedings Volume 4375, Window and Dome Technologies and Materials VII; (2001) https://doi.org/10.1117/12.439196
Event: Aerospace/Defense Sensing, Simulation, and Controls, 2001, Orlando, FL, United States

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.

Citation Download Citation

Hideo Wada, Ken-ichiro Shibata, Masashi Yamashita, Shigeru Nakayama, and Akihito Fujii "Polycrystal GaAs infrared windows", Proc. SPIE 4375, Window and Dome Technologies and Materials VII, (7 September 2001); https://doi.org/10.1117/12.439196

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