Theory of optical parametric oscillator in the quadratic and cubic approximationsстатья
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Аннотация:Optical parametric oscillators (OPOs) operate by implementing spatially distributed nonlinear interactions between several optical waves. In general cases the OPO generation process is not amenable to an exact analytical solution. As for special cases where exact analytical solutions exist, it provides no evident insight to the underlying physics. In the work we analyse the accuracy of wave amplitude approximations by quadratic and cubic functions in the example of the ring-cavity double-resonant OPO, which were applied for the transient and quasistationary regimes. We have established that the non-stationary regime is described by these approximations equally well in that it provides a good estimate for the transient time in a wide range of pump parameter values. In contrast, the cubic approximation has been shown to be much more accurate, in both the near and far-above threshold regimes, so that this approximation yields more reliable estimates of the OPO emission characteristics.