Abstract

By using a high-precision FM Brillouin spectrometer with the spectral resolution of $20\mathrm{kHz}$, we have succeeded in determining the Brillouin linewidth of single-crystal ${\mathrm{LiTaO}}_3$. The large directional anisotropy for the attenuation rate of the longitudinal elastic wave and the extremely narrow Brillouin linewidth of $1.60\mathrm{MHz}$ have been observed at room temperature.

© 2007 Optical Society of America

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