Abstract: The acousto - optic interaction of plane light wave with spherical acoustic in

spherical cavity with open ends is investigated theoretically and experimentally. On basis

of the diffraction theory of light，the intensity distribution of diffracted light is

deduced. And then，an image of the diffracted light is displayed by numerical calcu- lation. On the

other aspect，the acousto-optic diffraction is measured with our apparatus. The measured wavelength

of acoustic wave is coincided with that of excited spherical acoustic wave.

Key words: light wave, spherical acoustic wave, acousto-optic interaction, intensity distribution of diffraction light