Four-wave scattering by phonon polaritons under excitation of small polarons in LiNbO3:Mg

被引：0

作者：

Kitaeva, GK ^{[1
]}

Kuznetsov, KA ^{[1
]}

Solosin, SV ^{[1
]}

Penin, AN ^{[1
]}

机构：

[1] Moscow MV Lomonosov State Univ, Dept Phys, Moscow 119899, Russia

来源：

ICONO 2001: NOVEL TRENDS IN NONLINEAR LASER SPECTROSCOPY AND OPTICAL DIAGNOSTICS AND LASER IN CHEMISTRY, BIOPHYSICS, AND BIOMEDICINE | 2001年 / 4749卷

关键词：

four-wave mixing; coherent scattering; phonon polariton; small polaron; lithium niobate;

D O I：

暂无

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We studied the coherent four-wave scattering of light by phonon polaritons in LiNbO3:Mg crystals before and after chemical reduction, which resulted in strong increase of small polarons. Large broadening of polariton lineshape was observed in a chemically reduced lithium niobate. To explain this effect we studied optical properties of Li-NbO3:Mg in the visible and IR regions, where the undoped LiNbO3 was sparent. As a result, absorption band was found, being sensitive to the chemical reduction. We assign this band to the small polaron absorption. The values of polaron shift and the mean value of frequency of optical phonons, which interact with free electrons in polaron formation, were measured. Influence of small polarons on polariton k-spectra was discussed.

引用

页码：48 / 55

页数：8

共 29 条

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