Abstract: In order to study the refractive index change of the acoustic-optic effect,the intensity distribution of the diffraction spectrum is analyzed by CCD image disposal based on ultrasonic grating experimentation.The phases delay Δ=1.2855 rad and the refractive index increment Δn=3.014×10-6 are obtained by the comparative numerical calculating value on the ultrasonic frequency 10.27MHz.The relation of the piezoelectricity coupling effciency with ultrasonic frequency is discussed,the most coupling efficiency value and the most refractive index increment are obtained for ultrasonic frequency 10.33MHz.The results show that this content can not only enrich experimentation content but can also grow on comprehend acoustic-optic effect on the ultrasonic grating experimentation.

Key words: ultrasonic grating, diffraction, intensity analysis, refractive index