We derived the relation between a figure of merit, M<sub>1</sub>, for the diffraction efficiency of acousto-optical devices and the Brillouin-gain coefficient, g<sub>B</sub>. We then estimated the values of g<sub>B</sub> and the phonon lifetime for typical As<sub>2</sub>S<sub>3</sub> and As<sub>2</sub>Se<sub>3</sub> chalcogenide glasses from known acousto-optical parameters. We found that the magnitude of g<sub>B</sub> for these two glasses is greater than 20 times that of fused silica.
© 2004 Optical Society of America
(160.1050) Materials : Acousto-optical materials
(160.2750) Materials : Glass and other amorphous materials
(190.4400) Nonlinear optics : Nonlinear optics, materials
(290.5900) Scattering : Scattering, stimulated Brillouin
Kazuhiko Ogusu, Hongpu Li, and Michihiko Kitao, "Brillouin-gain coefficients of chalcogenide glasses," J. Opt. Soc. Am. B 21, 1302-1304 (2004)