1. A method for determining a property of a material, the method comprising: illuminating the material with a light beam of controlled spectral and coherence properties; recording a stack of speckle field images from speckle fields reflected from the illuminated material in multiple spectral channels, wherein the stack of speckle field images comprises multiple speckle field images each being recorded in a respectively different spectral channel; analyzing statistical properties of the speckle field images in the stack of speckle field images to determine at least one property of the illuminated material.