BRIGHTNESS OF A PHASE-CONJUGATING MIRROR BEHIND A RANDOM MEDIUM

A random-matrix theory is presented for the reflection of light by a d isordered medium backed by a phase-conjugating mirror. Two regimes are distinguished, depending on the relative magnitude of the inverse dwe ll time of a photon in the disordered medium and the frequency shift a cquired at the mirror. The qualitatively different dependence of the r eflectance on the degree of disorder in the two regimes suggests a dis tinctive experimental test for cancellation of phase shifts in a rando m medium.