The generation of of second-harmonic power in a 32-cm-long periodically poled silica fiber, corresponding to an average conversion efficiency of , is reported. This represents the highest normalized second-harmonic conversion and the highest average second-harmonic power ever reported for a periodically poled silica fiber, to our knowledge. The enhancement is attributed to an improved design of the specialty twin-hole fiber and the extension of the nonlinear interaction length.
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P. G. Kazansky and V. Pruneri
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