Qiu, Tiequn and Maier, Max (1997) Long-distance propagation and damping of low-frequency phonon polaritons in LiNbO3. PHYSICAL REVIEW B, 56 (10). R5717-R5720. ISSN 2469-9950, 2469-9969
Full text not available from this repository.Abstract
The propagation and damping of low-frequency (10 to 80 cm(-1)), picosecond phonon-polariton pulses have been investigated in LiNbO3. The phonon polaritons propagate over a distance up to several centimeters. The measured frequency dependence of the absorption coefficient and the phase relaxation rate of the phonon polaritons is discussed using a model that takes into account the coupling of the phonon polaritons to a relaxational mode and to low-frequency excitations connected with defect centers. The much higher polariton damping at 300 K compared to 77 K is explained by the presence of the relaxational mode, which is missing at 77 K, and the larger coupling strength of the low-frequency excitations. The difference between the polariton damping of MgO doped LiNbO3 and congruent LiNbO3 is ascribed to the changes of the resonance frequencies of the defect centers.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUASIELASTIC LIGHT-SCATTERING; LITHIUM-NIOBATE; LITAO3; PULSES; TC |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 30 Mar 2023 07:55 |
| Last Modified: | 30 Mar 2023 07:55 |
| URI: | https://pred.uni-regensburg.de/id/eprint/50630 |
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