Abstract
Doungchin CaoUniversity of Alabama in HuntsvilleDepartment of Electrical andComputer EngineeringHuntsville, Alabama 35899Abstract. It is commonly known that the spatial profiles of the diffractedlight beams during Bragg acousto-optic interaction are distorted due tothe Bragg angle selection mechanism. All the conventional studies onthis effect use the paraxial approximation. But this approximation shouldbe amended when the incident angle of the light is large enough that thediffracted light waves do not propagate closely along the optic axis of theacousto-optic diffraction system. By using a spatial Fourier transformapproach, we rigorously study the light beam profile deformation effect ofthe diffracted light during the Bragg acousto-optic interaction beyond theparaxial approximation. Starting from the wave equation, a set ofcoupled-wave equations is derived to depict the acousto-optic effect.Analytic solutions that describe the profiles of the diffracted light arederived from the acousto-optic coupled-wave equations. From the solu-tions, differences can be found between the ones with and withoutparaxial approximation.
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