Characterization Of The Infrared And Far-Infrared Properties Of Sapphire And Quartz

Michael E. Thomas; Richard I. Joseph; George J. Simonis; Michael Stead

doi:10.1117/12.978478

18 November 1989 Characterization Of The Infrared And Far-Infrared Properties Of Sapphire And Quartz

Michael E. Thomas, Richard I. Joseph, George J. Simonis, Michael Stead

Proceedings Volume 1039, 13th Intl Conf on Infrared and Millimeter Waves; (1989) https://doi.org/10.1117/12.978478
Event: 13th International Conference on Infrared and Millimeter Waves, 1987, Honolulu, HI, United States

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.

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Michael E. Thomas, Richard I. Joseph, George J. Simonis, and Michael Stead "Characterization Of The Infrared And Far-Infrared Properties Of Sapphire And Quartz", Proc. SPIE 1039, 13th Intl Conf on Infrared and Millimeter Waves, (18 November 1989); https://doi.org/10.1117/12.978478

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