Infra-red transmitting optical components and optical coatings t

Details Infra-red transmitting optical components and optical coatings t Infra-red transmitting optical components and optical coatings t

1989-08-30

1991-04-16

Arnold, Bruce Y.

Compositions

Radioactive compositions

Nuclear reactor fuel

252587, 264 17, 350164, G02B 110, G02B 526

Patent

active

050076892

ABSTRACT:
Infrared transmitting optical components having a wide variety of substrates (e.g. ZnS, ZnSe, Ge, Si, SiO.sub.2) are disclosed all with an optical coating of boron phosphide (BP). The boron phosphide may be a single layer coating or one layer of a multilayer coating in which case it is preferably the penultimate layer. Coated components are provided which are very low in absorption, which are operable at high temperatures with minimal transmission loss, and which are transmitting in two IR wavebands. The boron phosphide layer is deposited by plasma-assisted chemical vapor deposition at a temperature in the range 300.degree.-500.degree. C. preferably using feedstock gases which are hydrogen-fee. Boron phosphide coatings of up to 40 .mu.m in thickness have been achieved.

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