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Scanning electron microscope image of the transverse section of the fiber used. (a) The lattice pitch, the core diameter, and the air-filling fraction were evaluated to be , , and , respectively. (b) Fiber end face fused with a gentle fusion arc showing that silica webs melt and pour into the fiber. For a longer heating process all peripheral holes are collapsed and only the central hole stands open.
Infrared experimental mode pattern shown in (a) is in good agreement with the computed one shown in (b).
Experimental setup of the fluorescent liquid fiber autocorrelator. LCF: liquid core fiber; SMF: single mode fiber; TPF: two photon fluorescence.
TPF autocorrelation product. The TPF signal continuous background has been subtracted.
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