We demonstrate single-mode guiding in a 4-μm-inner-diameter hollow photonic-crystal fiber filled with a highly nonlinear liquid. The nonlinear response of such a fiber is shown to drastically differ from a typical nonlinear response of a silica waveguide. Strong inertia of optical nonlinearity of the liquid filling the fiber core translates into a pulse-width-dependent red shift of the spectrally broadened fiber output.
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Voronin et al. (2009) studied this question.
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