Coherent backscattering effect on wave dynamics in a random medium

A dynamical effect of coherent backscattering is predicted theoretically an d supported by computer simulations: The distribution of single-mode delay times of waves reflected by a disordered waveguide depends on whether the i ncident and detected modes are the same or not. The change amounts: to a re scaling of the distribution by a factor close to root2. This effect appears only if the length of the waveguide exceeds the localization length; there is no effect of coherent backscattering on the delay times in the diffusiv e regime.