Measurement of coupled spatiotemporal coherence of parametric down-conversion under negative group velocity dispersion
Quantum Physics
2020-07-15 v1
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 with the introduction of time delay. We show a simple technique, based on a modified Mach-Zehnder interferometer, which allowed us to measure time coherence and near-field space coherence simultaneously, with complete control of both variables. This technique will be also suitable for the measurement of second-order coherence, where the main applications are related to the two-photon spectroscopy.
Keywords
Cite
@article{arxiv.2003.03635,
title = {Measurement of coupled spatiotemporal coherence of parametric down-conversion under negative group velocity dispersion},
author = {Paula Cutipa and Kirill Yu. Spasibko and Maria V. Chekhova},
journal= {arXiv preprint arXiv:2003.03635},
year = {2020}
}