Ultrafast all-optical effects in quadratically nonlinear media are studied, with particular emphasis being given to the effect of group-velocity mismatch of the optical pulses at different carrier frequencies. The basic consequences of the resulting pulse walk-off for fundamental all-optical concepts based on quadratic nonlinearities, such as phase-insensitive amplification without and with cascading, intensity- and phase-controlled polarization rotation, and switching relying on phase modulation, are studied in detail. We derive optimal parameters for the application of these concepts in all-optical devices.
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Kobyakov et al. (1997) studied this question.
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