Schwarz, Ulrich T. and Maier, Max (1998) Damping mechanisms of phonon polaritons, exploited by stimulated Raman gain measurements. PHYSICAL REVIEW B, 58 (2). pp. 766-775. ISSN 1098-0121, 1550-235X
Full text not available from this repository.Abstract
Using a two-beam amplifier experiment stimulated Raman gain measurements were performed for the polariton branch of the 256-cm(-1) A(1) (TO) optical phonon mode in ZnO-doped congruent LiNbO3 and undoped nearly stoichiometric LiNbO3 for polariton frequencies from 30 to 230 cm(-1). The dependence of the peak Value and linewidth of the Raman gain curve on the polariton frequency provides derailed information on the frequency-dependent damping of the polariton, Spontaneous Raman spectra of the 256 cm(-1) phonon, with particular emphasis upon the low-frequency wing of the Raman line, complete the results. The experimental results are carefully analyzed by comparison with a theory connecting the stimulated and spontaneous Raman data to the dielectric function of LiNbO3, which contains the damping of the polaritons. As damping mechanisms the anharmonic decay of the phonon part of the polariton, the scattering at crystal defects and the coupling to low-frequency excitations are discussed. We relate three of the low-frequency excitations to E phonon modes of LiNbO3 and the major part to defect modes. [S0163-1829(98)05925-6].
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LITHIUM-NIOBATE; SCATTERING; LINBO3; LITAO3; CRYSTALS; PULSES; PROPAGATION; GENERATION; DISPERSION |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Experimental and Applied Physics > Alumni or Retired Professors > Group Ulrich Schwarz |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 23 Feb 2023 11:47 |
| Last Modified: | 23 Feb 2023 11:47 |
| URI: | https://pred.uni-regensburg.de/id/eprint/49713 |
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