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Proceedings Paper

Lead-indium phosphate glasses for optical applications
Author(s): Brian C. Sales; Lynn A. Boatner; Stephen W. Allison
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Paper Abstract

A new glass system based on a range of lead-indium phosphate compositions has been developed. These glasses have a relatively high index of refraction (1.8 - 1.9) in the visible region and exhibit moderate dispersion (typical Abbe number of 32). The ultraviolet absorption edge occurs near 300 nm and the glasses strongly absorb in the infrared at wavelengths greater than 2800 nm. The glasses can be prepared at relatively low temperatures (900 - 1000 degree(s)C) and are easily poured at temperatures near 800 degree(s)C due to their low melt viscosities. Lead-indium phosphate glasses exhibit good chemical durability and resistance to both weathering and intense gamma-irradiation. These materials have a glass transition temperature of 430 degree(s)C, and thermal expansion coefficients in the range of 11 to 12 X 10-6/ degree(s)C. The structure of these glasses consists of a distribution of chains of PO4 tetrahedra held together by bonding between the non- bridging oxygen of the tetrahedra and the metal cations. The polyphosphate chain distribution was determined using the technique of high-performance liquid chromatography. The high index of refraction of lead-indium phosphate glasses makes them attractive for several applications such as high-numerical-aperture optical fibers and specialty lenses. Optical fibers up to 60 m in length have been drawn, and several simple lenses have been designed, ground, and polished. Preliminary results on the ability to directly cast optical components of lead- indium phosphate glass are also discussed as well as the suitability of these glasses as a host medium for rare-earth ion lasers and amplifiers.

Paper Details

Date Published: 21 October 1994
PDF: 7 pages
Proc. SPIE 2287, Properties and Characteristics of Optical Glass III, (21 October 1994); doi: 10.1117/12.190940
Show Author Affiliations
Brian C. Sales, Oak Ridge National Lab. (United States)
Lynn A. Boatner, Oak Ridge National Lab. (United States)
Stephen W. Allison, Oak Ridge National Lab. (United States)

Published in SPIE Proceedings Vol. 2287:
Properties and Characteristics of Optical Glass III
Alexander J. Marker, Editor(s)

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