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Proceedings Paper

Characterization Of The Infrared And Far-Infrared Properties Of Sapphire And Quartz
Author(s): Michael E. Thomas; Richard I. Joseph; George J. Simonis; Michael Stead
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Paper Abstract

High-quality room-temperature data have been obtained on single-crystal sapphire and quartz in the far infrared (ν = 50-200 cm -1) and found to follow the expected v2 variation (based on the fluctuation-dissipation theorem, e.g., Huber and Van Vleck). An extrapolation to lower frequencies following the v2 curve is found to be consistent with experimental data down to 1 cm -1. It has been physically argued in the past that the absorption mechanism in this region arises from broad phonon difference bands. We find that a substantial fraction of the observed absorption is consistent with a red-wing extrapolation from the dominant one-phonon modes seen in the reflection spectrum. A combination of these two mechanisms is believed to account for the smooth falloff in absorption that is observed.

Paper Details

Date Published: 18 November 1989
PDF: 3 pages
Proc. SPIE 1039, 13th Intl Conf on Infrared and Millimeter Waves, (18 November 1989); doi: 10.1117/12.978478
Show Author Affiliations
Michael E. Thomas, Johns Hopkins University Applied Physics Laboratory (United States)
Richard I. Joseph, Johns Hopkins University Applied Physics Laboratory (United States)
George J. Simonis, Johns Hopkins University Applied Physics Laboratory (United States)
Michael Stead, Johns Hopkins University Applied Physics Laboratory (United States)


Published in SPIE Proceedings Vol. 1039:
13th Intl Conf on Infrared and Millimeter Waves
Richard J. Temkin, Editor(s)

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