Picosecond acoustic phonon dynamics in LaF3:Pr3+

Details Picosecond acoustic phonon dynamics in LaF3:Pr3+ Picosecond acoustic phonon dynamics in LaF3:Pr3+

Sep 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998phrvb..58.5417k&link_type=abstract

Physical Review B (Condensed Matter and Materials Physics), Volume 58, Issue 9, September 1, 1998, pp.5417-5422

Physics

Condensed Matter

Phonon States And Bands, Normal Modes, And Phonon Dispersion, Far Infrared

Scientific paper

A plasma switching technique is used to generate subnanosecond, far-infrared (FIR) pulses with frequency 113 cm-1. The generation of subnanosecond FIR pulses enables us to improve the time resolution of phonon spectroscopic measurements from 50 ns to 350 ps. As an application of this technique, we investigate the subnanosecond dynamics of high-frequency phonons in 0.5% LaF3:Pr3+. In particular, we report on the generation and detection of a subnanosecond nonequilibrium phonon population at 113 cm-1, and the temporal evolution of the resulting decay products. The frequency dependence of the phonon relaxation rates of acoustic phonons in this material is found to deviate from the ω5 frequency dependence predicted by an isotropic model with linear dispersion. A more realistic model based on the actual dispersion curves of the material is presented and compared with the data.

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