The elastic and photoelastic properties of ZnSe and Ca<sub>3</sub>(VO<sub>4</sub>)<sub>2</sub> crystals have been investigated by acousto-optic Bragg diffraction. Stimulated Raman scattering (SRS) in Ca<sub>3</sub>(VO<sub>4</sub>)<sub>2</sub> crystals has also been also studied, using trains of short picosecond pulses. The acousto-optic quality index M<sub>2</sub> of ZnSe is a factor of 4-20 greater than in LiNbO<sub>3</sub>, and this makes ZnSe an efficient medium of acousto-optic interaction. As a consequence of the existence of a broad SRS active mode and the steady-state character of SRS, Ca<sub>3</sub>(VO<sub>4</sub>)<sub>2</sub> crystals are attractive for the efficient conversion of picosecond pulses.

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