Abstract
The four nonlinear coupled wave equations describing a doubly-resonant degenerate optical parametric oscillator (DROPO) with a Fabry-Pérot-type resonator having arbitrary mirror reflectivities are solved exactly, apparently for the first time. The solutions makes it possible to predict the behavior of the DROPO under conditions where the usual linearized theory fails. An exact analytical expression for the threshold of oscillation has also been obtained. These results are used to show how the DROPO may be optimized for high conversion efficiency and/or maximum output intensity, and it is shown that 100 percent conversion efficiency is possible.
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