Abstract
Monochromatic, high occupation number phonon populations are generated using defect-induced one-phonon absorption of far infrared radiation. Phonons are detected in a time-resolved frequency selective manner using an absorption vibronic sideband phonon spectrometer. We use these techniques to investigate the spectral and temporal dynamics associated with phonon decay. We concentrate on investigating phonon relaxation mechanisms which can occur in addition to spontaneous anharmonic three-phonon processes.
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