Reinvestigation of the Dispersion Relation of A<FONT SIZE="-1">1</FONT> Phonon-Polariton in LiNbO<FONT SIZE="-1">3</FONT> by the Improved Heterodyne ISRS Study

Takeo Watanuki; Shinya Yoshioka; Masaru Kasahara; Timothy F. Crimmins; Keith A. Nelson; Toshirou Yagi

doi:10.1143/jpsj.70.2784

Reinvestigation of the Dispersion Relation of A₁ Phonon-Polariton in LiNbO₃ by the Improved Heterodyne ISRS Study

Takeo Watanuki, Shinya Yoshioka, Masaru Kasahara, Timothy F. Crimmins, Keith A. Nelson, Toshirou Yagi

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Keywords: LiNbO₃, ISRS, femtosecond spectroscopy, heterodyne detection, optical phase mask, phonon-polariton, dispersion relation

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2001 Volume 70 Issue 9 Pages 2784-2787

DOI https://doi.org/10.1143/jpsj.70.2784

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Abstract

The dispersion relation of the A₁ phonon-polariton of ferroelectric LiNbO₃ has been studied by the impulsive stimulated Raman scattering (ISRS) experiment improved with optical phase masks and heterodyne detection. A simple dispersion relation is revealed in contrast to the previous heterodyne ISRS study where several avoided crossing points were reported. The static dielectric constant obtained from the gradient of the dispersion curve with respect to the wave vector shows a good agreement with the previous dielectric measurement.

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