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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Zhu et al. (2010) studied this question.
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