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Proceedings Paper

Laser saturation of the hydride ion local mode vibration in CaF2
Author(s): W. J. Knott
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Paper Abstract

We present a study of the localized vibrational mode of H- ions substituting F- ions in the calcium fluoride lattice. Using a tunable high pressure carbon dioxide laser we determined the linewidth and the saturation intensity of the H- local mode infra-red absorption line for temperatures between 10 K and 110 K. Our results indicate that energy relaxation of an excited H- vibrational mode occurs mainly by decay into three phonons with a lifetime for the localized mode of about 17 ps at low temperatures (T ≤ 10 K), which results in a Lorentzian line of width 0.33 cm-1. An analysis of our results shows that line broadening is caused mainly by energy relaxation at temperatures up to 60 K and by phonon Raman scattering at higher temperatures.

Paper Details

Date Published: 4 December 2017
PDF: 2 pages
Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15767B (4 December 2017); doi: 10.1117/12.2297976
Show Author Affiliations
W. J. Knott, Univ. Regensburg (Germany)

Published in SPIE Proceedings Vol. 1576:
16th International Conference on Infrared and Millimeter Waves
Minh Quang Tran, Editor(s)

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