Phase-matching with a twist: second-harmonic generation in birefringent periodically poled fibers

Zhu, E.Y., Qian, L., Helt, L.G., Liscidini, M., Sipe, J.E., Corbari, C., Canagasabey, A., Ibsen, M. and Kazansky, P.G. (2010) Phase-matching with a twist: second-harmonic generation in birefringent periodically poled fibers. Journal of the Optical Society of America B, 27 (11), 2410-2415. (doi:10.1364/JOSAB.27.002410).

Abstract

We show theoretically and experimentally that twisting a birefringent periodically poled fiber with an artificially induced χ(2) results in second-harmonic phase-matchings that are not permitted in untwisted fibers. We further demonstrate that both the strengths and the spectral positions of the generated second-harmonic signals can be controlled by changing the amount of twist. Of particular interest is a type II phase-matched signal emerging through and greatly enhanced by the twisting.

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