Twin-photon generation measured and modeled over 10 orders of magnitude of pump intensity
Julien Bertrand, Véronique Boutou, Benoı̂t Boulanger · Journal of the European Optical Society Rapid Publications · 2025
We proposed a semi-classical model of spontaneous parametric down-conversion (SPDC) based on both the quantum fluctuations of vacuum for the seeding of the process and a propagation step ensured by classical fields. We obtained an agreement over a broad pump intensity range, i.e., 2.4 W cm −2 to 3.7 GW cm −2 , which led to the generation of twin-photons with a flux from 1.1 × 10 4 Hz to 1.2 × 10 21 Hz, respectively. The predictivity of our model is much better than the best published quantum models at high intensity, while it is similar at low intensity.