Abstract

Self- and cross-phase modulation in a synchronously pumped optical parametric oscillator (SPOPO) was investigated both theoretically and experimentally. Cubic nonlinearity, group-velocity walk-off, group-velocity dispersion, quadratic broadening, and parametric interaction with depletion and backconversion were included in the theoretical investigation. It was found that asymmetry of the spectrally broadened SPOPO pulses is caused by cross-phase modulation introduced by the pump pulses. Experimental studies of the effects of pumping intensity and cavity detuning on spectral broadening and pulse compression were performed. Excellent agreement between numerical and experimental results was found in the giant-pulse-compression mode of operation. A train of 1.7-ps pulses at 527 nm synchronously pumped the SPOPO based on KDP with type II phase matching.

© 2002 Optical Society of America

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