Abstract
The interaction of transverse picosecond deformation pulses with a system of S=1/2 spins, forming a paramagnetic crystal, is investigated theoretically. The influence of acoustic dispersion, owing to the lattice structure, and the anharmonicity of atomic vibrations on the formation of stationary soliton-like video pulses, interacting with the spins of paramagnetic atoms, is studied for the example of a cubic crystal. The phenomenon of total reflection of deformation pulses from the paramagnetic crystal is predicted. The amplification and self-compression of nonresonant pulses in nonequilibrium paramagnetics is studied, and it is shown that generation of higher-order (up to tenth-order) harmonics of the frequency of the initial signal is possible. It is concluded that for appropriate crystal parameters, a “limiting” solition with a duration of one period of the oscillations, corresponding to spatial size of the order of the lattice constant of the crystal, is possible at the final stage of amplification.
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