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 describing the dynamics of a laser pulse in a hydrogen-bonded ferroelectric, which has photorefractive properties in its disordered phase (KDP, DKDP). The creation threshold is determined for solitons, which describe evolution of the envelope of a laser pulse, and a study is made of the laser pulse behaviour as a function of the parameters of the problem. Evolution of the soliton amplitude and velocity, resulting from the photorefractive effect, is studied. The influence of the degree of deuteration of samples on the parameters describing soliton evolution is investigated. An analysis is made of the physical mechanisms of the predicted effects.