… beam coupling and degenerate four-wave mixing in high-resistivity, undoped GaAs at 1.06
μm that is due to the photorefractive effect. … By exploiting the photorefractive effect, we have …

… organic photorefractive polymer as a function of electric field by using two-beam coupling. …
shifted photorefractive grating. However, in moderate-to-high electric fields a much stronger …

… Photorefractive materials exhibit two beam coupling because … Two-beam cou pling is not
found in most nonlinear materials, … two-beam coupling as well as an effect called beam fanning (…

… In this section, we will derive the expression for the photorefractive phase-shift due to two-beam
coupling in photorefractive materials which is one of the most important factors that …

… Amplification of coherent light beams, including amplification of beams carrying optical …
3~) of the photorefractive effect. The dynamic nature of the beam coupling during the two-wave …

… To elucidate the behavior of steady state beam coupling, we cite thesolution of the coupled
wave equations that governs the interaction of twobeams of light in a nonlinear optical …

… We have provided here a wide range of experimental results for beam coupling … existing
theories of beam coupling in photorefractive materials by including large signal effects, ie, …

… study the photorefractive effect in GaAs was beam coupling. Experimenta11y, two beams of
… The crystal orientation of the sample and its relationships with the incident beam plane and …

… -beam-coupling gain coefficients exceeding the absorption coefficient are demonstrated for
the first time to our knowledge in an organic photorefractive … The photorefractive performance …

… Coupled wave theory In this section coupled wave theory is applied to predict beam coupling
… to account for diffraction into higher order beams. However a solution derived using thin …