Population dynamics of H- local modes in CaF2 : Lu3+ crystals studied using a free-electron laser

TitlePopulation dynamics of H- local modes in CaF2 : Lu3+ crystals studied using a free-electron laser
Publication TypeJournal Article
Year of Publication2001
AuthorsJ.PR Wells, I.V Bradley, G.D Jones, C.R Pidgeon
JournalJournal of Physics-Condensed Matter
Volume13
Number10
Pagination2137-2145
Date PublishedMar 12
ISBN Number0953-8984
Abstract

We report on pump-probe measurements of vibrational decay times for the H- (X, Y) and Z local modes of CaF2:Lu3+ C-4 nu H- centres using the Dutch free-electron laser. For excitation of the (X, Y) mode, a 10 K lifetime of 43 picoseconds is measured and is attributable to three-phonon anharmonic relaxation. which accounts well for the temperature dependence of the decay rate. The 10 K Lifetime of the higher-energy Z mode results from a combination of one-phonon decay to the (X, Y) modes and three-phonon decay to the ground state. A simple rate equation model gives a good account of the observed transient.

DOI10.1088/0953-8984/13/10/308
PID

5fcb05c3f2e362a3131670725a8fb7c1

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