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arXiv · 2506.09243

Kerr nonlinearity, self-injection locking and correlation in a microresonator

Andrey Matsko·Abdelkrim El Amili·Lute Maleki
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Abstract

Production of entangled photon pairs is important in secure communication systems, quantum computing, and fundamental physics experiments. Achieving efficient generation of such photon pairs with low-loss parametric oscillators is a key objective in advancing integrated quantum technologies. However, spatially separating the generated photons while preserving their entanglement represents a significant technical challenge. In this work, we demonstrate nonlinear generation of correlated optical harmonics based on non-degenerate four-wave mixing with an optimally pumped optical microcavity with Kerr nonlinearity. The phase matching of the process is achieved with self-injection locked lasers producing parametric oscillation while locked to two different modes of the microresonator. This condition is reminiscent of slow-light technique developed for coherent atomic systems. The experimental design, utilizing counterpropagating light from two self-injection locked lasers, also effectively addresses the challenge of spatial separation of the generated harmonics. We validate the theoretical predictions using two self-injection locked semiconductor lasers integrated with a crystalline whispering gallery mode resonator with optimized spectral structure.

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Andrey Matsko, Abdelkrim El Amili, Lute Maleki. 2025-06-10. Kerr nonlinearity, self-injection locking and correlation in a microresonator. https://arxiv.org/abs/2506.09243

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