Raman Light Scattering by Overtone States of Polar Fundamental Modes in a Lithium Tantalate Single Crystal

被引：0

作者：

Gorelik, V. S. ^{[1
,2
]}

Sverbil, P. P. ^{[1
]}

机构：

[1] Russian Acad Sci, Lebedev Phys Inst, Moscow 119991, Russia

[2] Bauman Moscow State Tech Univ, Moscow 105005, Russia

来源：

BULLETIN OF THE LEBEDEV PHYSICS INSTITUTE | 2021年 / 48卷 / 03期

基金：

俄罗斯基础研究基金会;

关键词：

Raman scattering; overtone; lithium tantalate; fundamental mode; bound state; biphonon; TEMPERATURE-DEPENDENCE; LINBO3; RESONANCES; LITAO3; POINT;

D O I：

10.3103/S1068335621030040

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Raman scattering (RS) spectra in lithium tantalate single crystals are studied at 180-degree scattering geometry in a wide frequency spectral range (50-2500 cm(-1)). RS intensity peaks corresponding to fundamental transverse (TO) and longitudinal (LO) polar optical modes of this crystal are recorded. It is found that the high-frequency spectral range (1300-2000 cm(-1)) contains RS intensity peaks whose frequencies exceed doubled frequencies of A(1)- and E-type fundamental vibrations of the LiTaO3 lattice. The intensity of these peaks appeared comparable to the intensity of lines corresponding to A(1)- and E-type fundamental transverse and longitudinal polar optical modes. The conditions of the appearance of bound states of polar phonons in the RS spectra of lithium tantalate crystal are analyzed.

引用

页码：63 / 67

页数：5

共 27 条

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