We survey previous research on liquid-core fiber optics. These waveguides exhibit a number of interesting characteristics which are of use to sensing, spectroscopy, and communications. We discuss liquid-core optical fibers in regard to applications involving high-peak-power transmission of laser light. The roles of liquid properties, nonlinearities, and fiber-to-waveguide coupling are discussed. The self-healing capability of such a waveguide following laser-induced breakdown is demonstrated.

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