Fig. 1 | Light: Science & Applications

Fig. 1

From: Entangled photons enabled time-frequency-resolved coherent Raman spectroscopy and applications to electronic coherences at femtosecond scale

Fig. 1

a Schematic of entangled twin photons as ultrafast probe for molecules, where the parametric down conversion through a beta barium borate (BBO) crystal and multi-photon detection are presented. b Quantum heterodyne scheme of detection where a local oscillator interferes with emitted photons in s arm; Detector 1 records the interference term whereas detector 2 records the idler photon number, yielding the joint detection. c Level scheme of microscopic model in Quantum FAST CARS. d Level scheme of microscopic model in QFRS for electronically excited states. e Quantum FAST CARS signal from Eq. (6), taking the 4 Raman-active modes A1, E and T2 in methane (CH4), where the parameters are \({\sigma }_{0}^{-1}=35\) fs for broadband probe and \({\gamma }_{bg}^{-1}=16\)ps, 20ps, 15ps, 22ps

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