We report on the realization of a liquid-filled optical microcavity and demonstrate photon-pair generation by spontaneous four-wave mixing. The bandwidth of the emitted photons is ∼300 MHz and we demonstrate tuning of the emission wavelength between 770 and 800 nm. Moreover, by employing a liquid as the nonlinear optical medium completely filling the microcavity, we observe more than a factor 103 increase of the pair correlation rate per unit pump power and a factor of 1.7 improvement in the coincidence/accidental ratio as compared to our previous measurements.
@article{arxiv.1907.09044,
title = {Correlated photon-pair generation in a liquid-filled microcavity},
author = {Felix Rönchen and Thorsten F. Langerfeld and Michael Köhl},
journal= {arXiv preprint arXiv:1907.09044},
year = {2019}
}