A numerical study incorporating walkoff, depletion and diffraction for a nanosecond optical parametric oscillator

Nanosecond optical parametric oscillators (OPO) are widely used as wavelength tunable radiation sources. Despite their practical use, few theoretical investigations for OPOs in nanosecond regime have been reported. Our numerical model which include depletion, walkoff, and diffraction employs the Runge-Kutta method with Fourier-space transform which has been proved to give the best accuracy in simulating second-order nonlinear interactions in birefringence media.