Engineering Journal: Science and InnovationELECTRONIC SCIENCE AND ENGINEERING PUBLICATION
Certificate of Registration Media number Эл #ФС77-53688 of 17 April 2013. ISSN 2308-6033. DOI 10.18698/2308-6033
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Article

One- and two-phonon density of states in lithium niobate crystals

Published: 19.10.2013

Authors: Anikjev A.A.

Published in issue: #7(19)/2013

DOI: 10.18698/2308-6033-2013-7-837

Category: Instrumentation | Chapter: Optical engineering

Numerical calculation of the Raman spectral intensity in lithium niobate at phase transition temperature was carried out. Dispersion curves for optical and acoustical phonons over the Brillouin zone were approximated from slow neutron scattering data. It was shown that the experimental observed Raman spectra changes in lithium niobate at the phase transition temperature agree with the theoretical one in the framework of the used model. As a result of the numerical calculation some peculiarities in the acoustic phonon density of states (acoustic biphonon) and the resonant differential phonon state - two-phonon optical bound state were observed.