Fig. 3
From: Optical analogue of the dynamical Casimir effect in a dispersion-oscillating fibre
Photon pairs and coincidence-to-accidental ratio (CAR). a Histogram of coincidence counts between signal photons at λs = 954 nm and idler photons at λi = 1173 nm (bandwidth 1 nm) for pump λp = 1052.44 nm and Pp = 0.03 W. In inset a zoom around the zero delay peak. b 2D map of the CAR as a function of the signal and idler wavelengths for Pp = 0.03 W and a coincidence time window Δt = 1.7 ns
