Zinc sulfide body for optical purposes
AssigneeW. C. Heraeus GmbH
InventorsFritz Aldinger, Waltraud Werdecker
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Abstract
Optical-grade zinc sulfide bodies produced by the CVD technique and subjected to an aftertreatment under a high gas pressure and at elevated temperature possess improved optical properties. They are suited for use as infrared windows.
Claims8
A process for improving the light transmission from the 0.4 to about 0.5 micron wavelength range and the transmission at about 6 micron wavelength of an optical zinc sulfide body, produced by the CVD (Chemical Vapor Deposition) Technique which comprises contacting said optical zinc sulfide body at a temperature of at least 300.degree. C. with a gas or gas mixture which is under a pressure ranging from 800 to 3000 bars, which gas or gas mixture does not react to the said optical zinc sulfide body.
Dependencies are inferred from the claim text.