Interaction of an ultrashort optical pulse with the impurity subsystem of a hydrogen-containing ferroelectric

The dynamics of an ultrashort optical pulse in impurity-containing ferroelectrics with hydrogen bonds has been considered in terms of microscopic pseudospin formalism, which uses the approximation of unidirectional propagation without limitations on the pulse power. The effective equations for the electric field amplitude and ferroelectric polarization have been obtained and numerically solved. Quasi-soliton propagation modes of ultrashort optical pulses are revealed, and their dependences on the microscopic Hamiltonian parameters are analyzed.