Characteristics of polychromatic speckle fields and temporal coherence

The connection between contrast changes of intensity distribution of speckle pattern, obtained for polychromatic illumination of scattering object and coherence characteristics of wave is considered. It is shown, that changes of mean contrast of speckle field (from center of pattern toward the periphery), obtained for quasimonochromatic illuminating wave may by connected with spectral range of the wave. The experimental results are presented.