Sharp Small-Scale Perturbations of Fringes at the Interference of Dispersed Broad-Spectrum Laser Beams

Abstract

The interference of two dispersed laser speckle-fields with a great spectrum width has been studied by numerical modeling. Local small-scale perturbations of interference fringes with an abrupt drop of contrast in the interference picture have been revealed. It has been shown that these perturbations occur in the region of a large phase gradient and a small module of the mutual coherence function of coinciding interfering fields. The analytical description of small-scale perturbations is given, and the probability of their appearance is estimated.