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arXiv · 2409.09813

Mode hitching in traveling-wave optical parametric amplification

Joseph Kelly·Eleanor Fradgley·Lida Zhang·Vincent Boyer
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Abstract

Optical parametric amplifiers (OPAs) in traveling wave configuration can generate localized spatial quantum correlations between a signal and an idler beam, a useful resource for quantum imaging. This study focuses on the classical transverse dynamics of the signal and idler beams when they propagate in a generic thick OPA at a nominally small angle. It shows that the beams tend to copropagate while maintaining a fixed separation, a phenomenon that we term hitching. We provide a model for hitching, validated by a numerical simulation, and we provide an experimental demonstration using four-wave mixing (4WM) in a hot atomic vapor. It shows that the OPA gain is the primary influence on the final hitching distance. These results have implications for the generation of multi-spatial-mode squeezed light for quantum imaging applications, where the exact spatial correspondence between the quantum fluctuations of the signal and the idler is of prime importance.

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Joseph Kelly, Eleanor Fradgley, Lida Zhang, Vincent Boyer. 2024-09-15. Mode hitching in traveling-wave optical parametric amplification. https://doi.org/10.1103/physreva.111.033523

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