Polarization-dependent and intensity-dependent phase mismatch of second-harmonic generation in optical fibers.
The second-harmonic dependence on the input fundamental light has been measured in optical fibers having a chi((2)) induced by seeding. The results are explained with a model that includes self-phase and cross-phase modulation in the equations governing second-harmonic generation and seeding. This leads to an intensity-dependent phase mismatch whose strength also depends on the relative polarizations of the fundamental and second-harmonic lights. During seeding, the same effects result in a chi((2)) grating detuned from exact phase matching.
Ouellette
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