Backward optical parametric oscillator threshold and linewidth studies

We carry out a theoretical investigation of the backward interaction optical parametric oscillator (OPO), in which one generated waves is counterpropagating with respect to pump. derive simple, self-consistent analytical formulas for continuous-wave and pulsed regimes. While consistent previous works on regime, our study enables us extend analysis regime. In particular, we simple expressions oscillation build-up time, threshold, efficiency, first knowledge. also investigate peculiar spectral features OPO when pumped narrow-linewidth radiation, absence tolerance phase mismatch natural ability emit two Fourier-transform-limited spectrum. A comparison conventional forward carried emphasize unique properties OPO.