Nonlinear optical propagation and self-limiting effect in liquid-crystalline fibers
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The nonlinear optical properties of the isotropic phase of liquid crystals induced by nanosecond laser pulses are analyzed in the context of nonlinear multi-mode propagation in a liquid-crystal-cored fiber. The negative thermal density nonlinearity of the core gives rise to an intensity-dependent loss in the core-guided transmission and optical action. Experiments conducted with such liquid-crystal-cored fibers show that the optical limiting threshold for nanosecond laser pulses can be as low as 0.09 J/cm2, which is one of the lowest among known nonlinear optical materials and structures, including bulk liquid-crystal films.
PACS42.81.-i 42.70.Df 42.65.-k
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