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Optical Engineering

Vacuum-ultraviolet characterization of sapphire, ALON, and spinel near the band gap
Author(s): Michael E. Thomas; William J. Tropf; Summer L. Gilbert
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Paper Abstract

Ultraviolet optical properties near the edge of transparency (just above and below the band gap) of polycrystalline ALON (aluminum oxynitride, Al23O27N5) and spinel are not well characterized. The edge of transparency is commonly found to obey Urbach's rule, and this is the case for single-crystal sapphire and polycrystalline ALON and spinel as well. Room-temperature transmission and reflection measurements are made from 2500 to 1150 Å on these materials and the corresponding absorption coefficient at the band gap is represented by Urbach's rule.

Paper Details

Date Published: 1 June 1993
PDF: 4 pages
Opt. Eng. 32(6) doi: 10.1117/12.135837
Published in: Optical Engineering Volume 32, Issue 6
Show Author Affiliations
Michael E. Thomas, Johns Hopkins Univ. (United States)
William J. Tropf, Johns Hopkins Univ. (United States)
Summer L. Gilbert, Univ. of Maryland (United States)

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