Alexander A. Betin

Vector phase conjugation with loop laser geometry

3. In (l) , the output fluence decreases when the depolarization induced by the h/4 into the loop increases, whereas in (2) the output fluence remains almost constant. The configuration (2) not only compensates for the phase aberrations but also for the depolarization aberrations. Indeed, in (2), both [loo] and [ O l O ] types of absorbing dipoles are sampled, which can lead to equal conjugate reflectivities along those two orthogonal axes forming a base, and thus to vectorial phase conjugation (VPC)? In (I) , only the [ loo] type of dipoles is sampled, as a consequence, VPC is not performed. In conclusion, Cr4+:YAG used in its specific configuration which can correct polarization aberrations appears as a promising nonlinear medium to realize SPPCM in NdYAG loop resonators. Such resonators produce selfQswitching by dynamic absorption grating formation, achieve greater-than-unity reflectivities, and can compensate for both intracavity phase and polarization aberrations.

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.

ND:YAG Loop Laser with a Thermal Holographic Mirror

Summary form only given. By using thermal holographic gratings recorded in slightly absorbing liquids as a mirror with a laser amplifier inside the loop optical scheme offers the possibility to build effective phase-conjugate lasers. We present results of an experimental investigation of Nd:YAG loop laser performance.