Infrared Transparent Selenide Glasses
Patent, filed 14 Mar 97, patented 8 Dec 98.
DEPARTMENT OF THE NAVY WASHINGTON DC
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A selenide glass with improved mechanical and optical properties such as extended transmission in the infrared region of radiation having wavelengths beyond 15 microns Tg in the region of 363 degrees-394 degrees C and thermal stability of 85 degrees-145 degrees C. based on the difference between Tg and Tx, comprising, on mol basis, 20-70 germanium selenide, 0.5-25 gallium selenide, indium selenide or mixtures thereof and 5-5O of at least one alkaline earth in selenide form is described. A process for improving mechanical and optical properties of a selenide glass based on germanium selenide comprises the steps of mixing glass components, including a modifier in elemental or selenide form melting the glass components to form a molten mixture cooling the molten glass mixture to a solid state annealing the solid glass and cooling the annealed glass to about room temperature is also described.
- Ceramics, Refractories and Glass