The conditions for self-focusing and stratification of a laser beam in liquid crystals at a temperature close to the phase-transition point from the isotropic to the liquid-crystal phase are found. It is shown that the spatial dispersion of the nonlinear susceptibility, due to a thermal or orientational mechanism, can ensure self-focusing of intense beams that is stable with respect to stratification. The analysis of the spatial dispersion mechanisms presented shows that liquid crystals are promising materials for forming continuous light beams of high intensity.
Кафедра общей физики для мехмата
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