Determination of the specklon "life length"

An experimental determination was made of the coefficient representing extinction of the speckle field at inhomogeneities of the permittivity induced by the field itself in a nonlinear medium with a local response. The extinction coefficient was found as a function of the amplitude of these inhomogeneities and of the angular divergence of the speckle field. The coefficient was directly proportional to the square of the amplitude of the inhomogeneities and inversely proportional to the square of the divergence of the speckle field. The experimental results were in agreement with theoretical predictions.