Abstract

We present experiments and numerical modeling of optical-pulse compression in a silver gallium sulfide, synchronously pumped optical parametric oscillator. In the experiments, 10 ps pump pulses from a pulsed Nd:YAG laser interacted in the parametric oscillator to generate infrared output pulses as short as 500 fs, yielding over 20-fold compression. Parametric conversion and pulse compression were studied by numerical simulation of the nonlinear wave equations and found to be in excellent agreement. The compression mechanism is related to group-velocity walkoff in the nonlinear interaction. Dispersion measurements and simulations of pulse compression in the wavelength range of 2.54.0μm indicate that compression is inversely related to the signal–idler group-velocity difference. Although compression requires group-velocity walkoff between the pump and signal waves, the compression is most strongly controlled by the mismatch between the signal and idler group velocities.

© 2005 Optical Society of America

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