Influence of the finite relaxation time of a hypersonic wave on the kinetics of formation of pulses as a result of stimulated Brillouin scattering in single-mode fiber waveguides

The results are given of numerical experiments on nonlinear kinetics of the generation of pulses as a result of stimulated Brillouin scattering (STBS) in an extended channeling medium (fiber waveguides). It is shown that the main laws governing the kinetics of STBS are determined by the relationship between the transverse relaxation time of a hypersonic wave and the propagation time of light in the medium. An investigation is made of the dependence of the period and depth of amplitude modulation of the transmitted and reflected waves on the relaxation time of a hypersonic wave and on the length of a fiber waveguide. It is shown that scattered-radiation pulses can have a peak intensity exceeding the intensity of the pump pulses even in the absence of focusing of the pump radiation or of a "seed" pulse at the Stokes frequency.