CHARACTERISTIC FEATURES OF NONLINEAR DYNAMICS OF A LASER-PULSE IN A PHOTOREFRACTIVE FERROELECTRIC WITH HYDROGEN-BONDS

A microscopic theory is used to derive an effective equation describin g the dynamics of a laser pulse in a hydrogen-bonded ferroelectric, wh ich has photorefractive properties in its disordered phase (KDP, DKDP) . The creation threshold is determined for solitons, which describe ev olution of the envelope of a laser pulse, and a study is made of the l aser pulse behaviour as a function of the parameters of the problem. E volution of the soliton amplitude and velocity, resulting from the pho torefractive effect, is studied. The influence of the degree of deuter ation of samples on the parameters describing soliton evolution is inv estigated. An analysis is made of the physical mechanisms of the predi cted effects.