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Second-harmonic generation in a quasi-phase matched waveguide produced using a domain-disordered GaAs-AlAs superlattice is modeled including the effects of group velocity mismatch, nonlinear refraction, two-photon absorption, and linear loss. The model predicts our experimentally observed second-harmonic powers within an order of magnitude. Self-phase modulation and two-photon absorption led to reduced...
Summary form only given. Through the mechanisms of nonlinear whole-beam self focusing (NSF) and linear group velocity dispersion (GVD), an ultrashort laser pulse can propagate relatively long distances underwater at moderate intensity (up to distances on the order of the attenuation length, approximately 10 meters in sea water), then quickly converge to an intense focus within a few centimeters at...
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