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Photonic crystal fibers have opened interesting new ways for guiding ultrashort laser pulses. Hollow-core fibers (HCF) enable guiding of short light pulses at significantly reduced nonlinearities, which avoids nonlinear distortions to the extent possible. The latest generation of these fibers exhibits remarkably low losses, which suggests HCFs as the ideal choice for femtosecond beam delivery. However,...
We demonstrate a novel photonic-crystal fiber architecture that breaks with the paradigm of lattice homogeneity and enables a new degree of freedom in photonic-crystal-fiber design. We experimentally demonstrate guiding of ap20-fs pulses over meter distance.
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