Thorium-free coating for germanium IR window

Details Thorium-free coating for germanium IR window Thorium-free coating for germanium IR window

1995-04-13

1996-07-16

Lerner, Martin

Optical: systems and elements

Having significant infrared or ultraviolet property

Multilayer filter or multilayer reflector

359581, 359582, G02B 111, G02B 528, B05D 506

Patent

active

055372465

ABSTRACT:
Durable thorium fluoride, low reflectance, high transmittance coatings for germanium (zinc sulfide, zinc selenide, gallium arsenide) exterior window surfaces are replaced using magnesium fluoride, a material previously not considered applicable to the 8 to 12 .mu.m wavelength range. This is enabled by the use of argon ion bombardment of the growing film. This method reduces the intrinsic stress of deposited films and permits growth of magnesium fluoride films of sufficient thickness to be used on the exterior surface of IR windows.

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Cox et al, "Infrared Filters of Antireflected Si, Ge, InAs, and InSb," Journal of the Optical Society of America, vol. 51, No. 7, Jul., 1961, pp. 714 to 718.

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