The generation of $236\mathrm{mW}$ of second-harmonic power in a 32-cm-long periodically poled silica fiber, corresponding to an average conversion efficiency of $15.2\pm 0.5\%$ , 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.

© 2009 Optical Society of America

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