Vacuum-ultraviolet characterization of sapphire, ALON, and spinel near the band gap

Michael E. Thomas; William J. Tropf; Summer L. Gilbert

doi:10.1117/12.135837

1 June 1993 Vacuum-ultraviolet characterization of sapphire, ALON, and spinel near the band gap

Michael E. Thomas, William J. Tropf, Summer L. Gilbert

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Optical Engineering, Vol. 32, Issue 6, (June 1993). https://doi.org/10.1117/12.135837

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.

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Michael E. Thomas, William J. Tropf, and Summer L. Gilbert "Vacuum-ultraviolet characterization of sapphire, ALON, and spinel near the band gap," Optical Engineering 32(6), (1 June 1993). https://doi.org/10.1117/12.135837

Published: 1 June 1993

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