| Numéro |
J. Phys. Colloques
Volume 42, Numéro C6, Décembre 1981
International Conference on Phonon Physics
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|
|---|---|---|
| Page(s) | C6-259 - C6-261 | |
| DOI | https://doi.org/10.1051/jphyscol:1981675 | |
International Conference on Phonon Physics
J. Phys. Colloques 42 (1981) C6-259-C6-261
DOI: 10.1051/jphyscol:1981675
Institut für Angewandte Physik, Universität Regensburg, 8400 Regensburg, F.R.G.
J. Phys. Colloques 42 (1981) C6-259-C6-261
DOI: 10.1051/jphyscol:1981675
DETECTION OF ACOUSTIC ZONE-BOUNDARY PHONONS BY PHONON DIFFERENCE ABSORPTION
H. Lengfellner et K.F. RenkInstitut für Angewandte Physik, Universität Regensburg, 8400 Regensburg, F.R.G.
Abstract
A new method for detection of zone-boundary phonons is reported. Phonons are detected by phonon difference absorption of far-infrared laser radiation. We present experimental results obtained for TlCl and TIBr crystals. Phonons are generated by nonradiative transitions in optically excited crystals. Our experiments indicate long-lived zone-boundary phonons at low crystal temperature and a strong decrease of the phonon lifetime with increasing temperature.