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Excitation of the coherent optical phonons of Eg-type in calcite by means of the active spectroscopy method

✍ Scribed by S. A. Akhmanov; N. I. Koroteev; A. I. Kholodnykh

Publisher: John Wiley and Sons
Year: 1974
Tongue: English
Weight: 458 KB
Volume: 2
Category: Article
ISSN: 0377-0486
DOI: 10.1002/jrs.1250020303

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✦ Synopsis

Abstract

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 the component of the nonresonant cubic electronic susceptibility were measured.

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