The interference component of low-coherent radiation backscattering

摘要

An interference component of backscattering of low-coherent radiation is calculated for the first time based on the previously developed approach consisting of direct simulation of the Bethe-Salpeter equation in terms of the Monte Carlo method. It is shown that, upon an increase in the spatial coherence length, it plays the role of the characteristic scale of the backscattering instead of the transport length. The effect of localization of backscattering of an ultrashort pulse in relation to the penetration depth is revealed. Both the theory and the numerical simulation predict, in accordance with experiment, a considerable broadening of the peak of coherent backscattering with decreasing coherence length, which significantly extends the application field of the effect, especially in biomedical diagnostics.