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Proceedings Paper

Infrared Transmitting Glass
Author(s): A. J. Worrall
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Paper Abstract

Glasses in the system Ge-As-Se have attractive properties for use in the 8-12μm band to correct chromatic aberration in optical systems based on germanium. The selection of a glass composition is described ana included consideration of the various desirable features of a practical optical material. A manufacturing method has been developed in which the glass is melted in a sealed tube to produce 7 Kg boules of glass at 75mm diameter and current slumping techniques increase the maximum diameter of blank to 160mm. The optical properties include a transmission range of 1 to 1511m, refractive index of 2.49 and an 8-1211m reciprocal dispersive power of 113. An anti-reflection coating developed for the 6-12μm band reduces surface reflection losses to about 2(), per surface. The physical properties indicate that the material is more suited to use as internal components. The glass can be optically worked using basically conventional techniques ana an outline of the prevention of toxic hazards during working is giyen. The optical quality has been assessed and a refractive index variation of 1 x 10-4 over 90% of the area found which allows the glass to be used in high resolution systems..

Paper Details

Date Published: 25 September 1979
PDF: 5 pages
Proc. SPIE 0163, Advances in Optical Production Technology II, (25 September 1979); doi: 10.1117/12.956905
Show Author Affiliations
A. J. Worrall, Barr & Stroud Limited (Scotland)

Published in SPIE Proceedings Vol. 0163:
Advances in Optical Production Technology II

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