Abstract
We have investigated the decay of nonequilibrium phonons in YAG:Pr3+ (1.0 at.%) at a temperature of 16 K. Nonequilibrium phonon populations are generated monochromatically with a high-power pulsed far-infrared laser using defect-induced one-phonon absorption and their temporal and spectral evolution determined using a time-resolved vibronic sideband spectrometer. We find that two decay mechanisms dominate the nonequilibrium phonon relaxation: anharmonic decay via three-phonon interactions and two-phonon one-electron inelastic-scattering processes. The latter mechanism leads to the evolution of a highly peaked phonon distribution that persists for several phonon generations.
Original language | English |
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Pages (from-to) | 900-902 |
Number of pages | 3 |
Journal | Physical Review B |
Volume | 44 |
Issue number | 2 |
DOIs | |
State | Published - 1991 |
Scopus Subject Areas
- Condensed Matter Physics