Image amplification by two- and four-wave mixing in BaTiO<inf>3</inf>photorefractive crystals

Effect of Strong Pump Depletion on Two-beam Coupling in Photorefractive BaTiO3at 442 nm

“…Two-beam coupling via the photorefractive effect in media such as BaTiO 3 crystals has been studied by several researchers because of its wide-ranging applications in coherent image amplification [1][2][3][4], image processing [5,6] and optical logic operation [7], etc . This two-beam coupling forms the underlying process for both signal beam amplification in two-wave mixing and beam fanning [8][9][10][11] .…”

Photorefractive properties of monodomain single crystal doped barium titanate

“…1 0~1 1~1 2 In Dijon University, many various single crystals were grown and characterized: electric and dielectric constants, birefringence and electrooptic coefficients were measured. Some photorefractive properties were studied: holograms were registered without and with an applied electric field; the energy transfer by two-wave mixing, the anisotropic diffraction and the self pumped conjugation mirror were realized with several crystals: a very simple classical model gave some results about space charge electric field, trap concentration and sign and number of the free charges.…”

Optical tracking filter using transient energy coupling

“…On the other hand, the transient behavior of the energy coupling (e.g., response time) is an important factor in characterizing device performance. 7 Transient energy coupling (TEC), including the interaction between two coherent beams and the induced grating formation, has been studied theoretically, and approximate analytic 8 -1 2 and numericall 3 solutions have been obtained. These studies [8][9][10][11] " 3 show that, although there is no steady-state energy exchange between the beams in unshifted dynamic holographic media, TEC occurs in such media with noninstantaneous responses.…”