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Excitation of the coherent optical phonons of E g ‐type in calcite by means of the active spectroscopy method
Author(s) -
Akhmanov S. A.,
Koroteev N. I.,
Kholodnykh A. I.
Publication year - 1974
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250020303
Subject(s) - phonon , spectroscopy , raman scattering , raman spectroscopy , optical parametric oscillator , excitation , laser , chemistry , scattering , atomic physics , optics , molecular physics , physics , materials science , condensed matter physics , quantum mechanics
The results of an experimental investigation of the twofold degenerate vibrations in calcite ( E g ‐type; phonon frequency Ω E /2π c = 721 cm −1 ) by means of active spectroscopy method, including a new modification of this method are reported. Beating of a biharmonic pump consisting of Nd: YAG laser radiation and tunable (narrow band or broad band) radiation from an optical parametric oscillator (OPO) was used to excite coherent optical phonons above the thermal level. Scattering of the second harmonic of Nd: YAG was used to detect these coherent vibrations. The components of the Raman scattering tensor for E g phonons and the absolute sign of χ NR 1122the component of the nonresonant cubic electronic susceptibility were measured.