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Optica Laser Congress (ASSL, LAC, LS&C)

A platform for generating twin-photons over 10 decades of pump intensity by second-order SPDC

Julien Bertrand, Véronique Boutou, Benoı̂t Boulanger

Published Jan 1, 2025• 0 citations
Publisher

Abstract

We generated twin-photons with a flux of 1.1x10 4 Hz to 1.2x10 21 Hz from SPDC in a phase-matched type II KTP crystal pumped between 2.4 W.cm -2 - 3.7 GW.cm -2 in the CW, nanosecond and picosecond regimes.
DOI
10.1364/assl.2025.jtu2a.48

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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.
We report implementation and modelling of an efficient photon-triplets generation experiment based on a difference-frequency-mixing of two picosecond beams at 532 nm and 1491 nm in a type II phase-matched KTP crystal. The photon-triplets flux was measured as a function of the energy of the two incident beams using a coincidence protocol. A maximal flux of 11.6 photon-triplets per second was achieved. These experimental data were satisfactorily described by a semiclassical model based on the quantum fluctuations of vacuum and the classical equations of nonlinear optics.