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 of the generated waves is counterpropagating with respect to the pump. We derive simple, self-consistent analytical formulas for the continuous-wave and pulsed regimes. While consistent with previous works on the continuous-wave regime, our study enables us to extend the analysis to the pulsed regime. In particular, we derive simple expressions of the oscillation build-up time, pulsed threshold, and efficiency, for the first time, to our knowledge. We also investigate the peculiar spectral features of the backward OPO when pumped with a narrow-linewidth pulsed radiation, in particular, the absence of tolerance to phase mismatch and the natural ability to emit two waves with a Fourier-transform-limited spectrum. A comparison with the conventional forward OPO is also carried out to emphasize the unique properties of the backward OPO. (C) 2022 Optica Publishing Group

Automated summary

In this study, we theoretically investigate the backward interaction optical parametric oscillator (OPO) and derive analytical formulas for the continuous-wave and pulsed regimes. We extend the analysis to the pulsed regime and provide simple expressions for the oscillation build-up time, pulsed threshold, and efficiency for the first time. We also explore the unique spectral features of the backward OPO when pumped with a narrow-linewidth pulsed radiation.