Two optical beams can couple in a photorefractive crystal without using the electro-optic
effect. Beam coupling is due to a spatially modulated absorption caused by the …

The geometrical configuration in which two pump beams and one non coplanar signal beam
are incident upon the same side of a bismuth silicate crystal is investigated. It is shown that a …

The development of a theory of four-wave mixing in photorefractive crystals is described.
This theory is solved in the undepleted pumps approximation with linear absorption and …

Two mutually incoherent extraordinary laser beams, incident upon opposite a faces of a
BaTiO_3 crystal, generate a set of photorefractive holograms that channel both beams …

Photorefractive materials have been used for demonstrating optical phase conjugation in a
wide variety of configurations. 1 A self-pumped photorefractive phase conjugator using …

We give a theoretical analysis of a “stimulated photorefractive backscattering and four-wave
mixing”(SPB-FWM) self-pumped phase conjugator (SPPC) in which the generation of the …

Exceptionally high values of photorefractive gain coefficient of up to 100 cm-1 have been
observed in Fe-doped and Fe/Tb-doped crystals of photorefractive lithium niobate. It is …

Photorefractive simple and double phase-conjugate mirrors very often exhibit strong
instabilities in their reflectivities. One of their possible origins can be the competition …

Expressions of the coupling constant for contradirectional two-wave mixing (CTWM) have
been derived. The calculations show that the energy transfer in CTWM has some unique …

A two‐dimensional model for the self‐pumped phase conjugation in a photorefractive crystal
is presented. In the model, no internal reflections at a corner of the crystal are explicitly …