Hybrid nonlinearity supported by nonconventionally biased photorefractive crystals
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- Zhang, P., Liu, S., Lou, C. et al. Appl. Phys. B (2009) 95: 559. doi:10.1007/s00340-009-3486-z
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We theoretically and experimentally demonstrate that a nonconventionally biased photorefractive crystal can support hybrid nonlinearity, i.e., coexistence of self-focusing and self-defocusing nonlinearities under an identical bias condition. It is revealed that the nonlinearity experienced by a one-dimensional (stripe) beam can be switched between self-focusing and self-defocusing solely by changing the beam orientation. For a two-dimensional beam, the hybrid nonlinearity leads to unusual nonlinear beam dynamics with enhanced anisotropy and nonlocality.