Laser saturation of the hydride ion local mode vibration in CaF2

W. J. Knott

doi:10.1117/12.2297976

4 December 2017 Laser saturation of the hydride ion local mode vibration in CaF₂

W. J. Knott

Proceedings Volume 1576, 16th International Conference on Infrared and Millimeter Waves; 15767B (2017) https://doi.org/10.1117/12.2297976
Event: 16th International Conference on Infrared and Millimeter Waves, 1991, Lausanne, Switzerland

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.

Citation Download Citation

W. J. Knott "Laser saturation of the hydride ion local mode vibration in CaF₂", Proc. SPIE 1576, 16th International Conference on Infrared and Millimeter Waves, 15767B (4 December 2017); https://doi.org/10.1117/12.2297976

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