2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/138893We present a multimode treatment of the optical parametric oscillator, which is valid for both pulsed and continuous-wave pump fields. The two-time correlation functions of the output field are derived, and we apply the theory to analyze a scheme for heralded production of non-classical field states that may be subsequently stored in an atomic quantum memory.11 pages, 6 figuresQuantum Physicstext