Phase conjugation of depolarized light with a loop PCM

The loop phase conjugate mirror (PCM) has attracted much of attention recently for application to high power solid state lasers. We suggest an idea how to modify the basic loop PCM optical scheme in order to work with depolarized radiation. In this paper we present experimental results showing near 100% polarization conjugation fidelity, in combination with compensation of phase distortions and high reflectivity. Basically, loop PCM is a laser that is seeded and triggered by an external signal beam, which we want to be phase conjugated.