Open Access
EXCITATION AND INTERACTION OF MULTI-MODE LATTICE VIBRATIONS IN α- LiIO3 CRYSTAL UNDER IRRADIATION OF AN INTENSE LASER
Author(s) -
徐丽雯,
雷子明,
赵汝文,
佘永柏
Publication year - 1981
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.30.138
Subject(s) - raman scattering , polariton , laser , excitation , excited state , raman spectroscopy , irradiation , materials science , photon , spectral line , lattice (music) , optics , molecular physics , crystal (programming language) , atomic physics , physics , quantum mechanics , astronomy , computer science , nuclear physics , acoustics , programming language
We have observed various spectra of stimulated Raman scattering (STRS) in a-LiIO3 crystal in different scattering geometries under irradiation of an electro-optically Q-switched second harmonic YAG laser. It is shown experimentally that more multi-mode lattice vibrations .can be excited by extra-ordinary incident photons than by ordi-nary ones. We have also observed the first and second order Stokes and anti-Stokes scat-tering lines of E1 mode, which are strong in intensity. The first, second and third order polariton Stokes and anti-Stokes lines are observed, as well as a new spectral line with a frequency shift of 496 cm-1 in anti-Stokes frequency region, which may be attributed to interactions among polaritons with various modes.Fatigue phenomena of Raman activation for the crystal have also been indicated experimentally.