Ultrasonic Light Diffraction Using a Narrow Light Beam –Transition from Diffraction to Deflection–

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Theoretical results of ultrasonic light diffraction using a narrow light beam whose intensity profile is Gaussian or square are described. As the beam width becomes narrower, instantaneous diffraction patterns for square beams show a complicated transition procss from diffraction to deflection, as compared with a smooth transition for Gaussian beams. Using a very narrow light beam, the angle of beam deflection cannot be determined from the time-averaged diffraction pattern, but can be determined from the instantaneous diffraction pattern.