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

J. P R Wells, Ian V. Bradley, Glynn D. Jones, Carl R. Pidgeon

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2 Citations (Scopus)


We report on pump-probe measurements of vibrational decay times for the H- (X, Y) and Z local modes of CaF2:Lu3+ C4v 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.

Original languageEnglish
Pages (from-to)2137-2145
Number of pages9
JournalJournal of Physics: Condensed Matter
Issue number10
Publication statusPublished - 12 Mar 2001


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