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Direct measurement of the coupled spatiotemporal coherence of parametric down-conversion under negative group-velocity dispersion

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Cutipa,  Paula
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nuremberg;

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Spasibko,  Kirill
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nuremberg;

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Chekhova,  Maria
Chekhova Research Group, Research Groups, Max Planck Institute for the Science of Light, Max Planck Society;
University of Erlangen-Nuremberg;
Physics Department, Moscow State University;

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Citation

Cutipa, P., Spasibko, K., & Chekhova, M. (2020). Direct measurement of the coupled spatiotemporal coherence of parametric down-conversion under negative group-velocity dispersion. Optics Letters, 45(13), 3581-3584. doi:10.1364/OL.397700.


Cite as: https://hdl.handle.net/21.11116/0000-0006-9CA6-F
Abstract
We present a direct measurement of the spatiotemporal coherence of parametric down-conversion in the range of negative group-velocity dispersion. In this case, the frequency-angular spectra are ring-shaped, and temporal coherence is coupled to spatial coherence. Correspondingly, the lack of coherence due to spatial displacement can be compensated for with the introduction of time delay. We show a simple technique, based on a modified Mach– Zehnder interferometer, which allows us to measure time coherence and near-field space coherence simultaneously, with complete control over both variables. This technique is also suitable for the measurement of second-order coher- ence, where the main applications are related to two-photon spectroscopy.