Based on the acousto-optic diffraction theory,the light diffraction characteristics of lowfrequency liquid surface waves was investigated using the method of optical.An expression was given about the non-corresponding orders,the analytical expression was simulated by means of the numerical method,which explains the mechanism of the non-correspondence effect.In experiment,the steady and visible diffraction pattern was observed,and the fringe spacing has obvious asymmetry.With the increasing of incident angle...
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