Two gaussian beam interference

Abstract

The equation for the intensity distribution of interference patterns, in a two dimension, produced by the two Gaussian beams having different beam parameters and some deviations from each other is derived. Some interference patterns are shown as functions of the two ratios of beam intensities and widths and of the beam deviation. The interference patterns are discussed in connection with the property of output beat signals in a differential laser Doppler velocimeter. Some experimental results are finally shown.