General analytic theory of classical collinear three wave mixing in a monolithic cavity

• URL: http://arxiv.org/abs/2010.06320v1
• Date: Tue, 13 Oct 2020 12:02:52 GMT
• Title: General analytic theory of classical collinear three wave mixing in a monolithic cavity
• Authors: Matteo Santandrea, Michael Stefszky and Christine Silberhorn
• Abstract summary: We present the analytic theory for a general, classical three wave mixing process in a cavity with arbitrary finesse and non-zero propagation losses. We demonstrate remarkable agreement between the presented model and the experimentally obtained highly complex second-harmonic spectrum of a titanium-diffused lithium niobate waveguide cavity.
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• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Integrated, monolithic nonlinear cavities are of high interest in both classical and quantum optics experiments for their high efficiency and stability. However, a general, analytic theory of classical three wave mixing in such systems that encompasses multiple monolithic designs, including both linear and nonlinear regions, as well as any three-wave mixing process has not yet been fully developed. In this paper, we present the analytic theory for a general, classical three wave mixing process in a cavity with arbitrary finesse and non-zero propagation losses, encompassing second harmonic, sum frequency and difference frequency generation - SHG, SFG and DFG respectively. The analytic expression is derived under the sole assumption of low single-pass conversion efficiency (or equivalently operating in the non-depleted pump regime). We demonstrate remarkable agreement between the presented model and the experimentally obtained highly complex second-harmonic spectrum of a titanium-diffused lithium niobate waveguide cavity that includes both a linear and nonlinear section. We then show the effect that reversing the linear and nonlinear regions has on the output spectrum, highlighting the importance of system design. Finally, we demonstrate that the model can be extended to include the effect of phase modulation applied to the cavity.

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