New parametric emissions in diatomic sodium molecules

Lu, Ze Sheng; Wang, Q.; He, Wanjun; G., Z.

doi:10.1007/bf01112836

Cited by 2 publications

(1 citation statement)

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“…Cascading FWM processes in strong field nonlinear experiments have been calculated − and observed. ,− These processes have been applied for the generation of new spectral components − and determination of the third-order nonlinear susceptibilities of noncentrosymmetric materials at several wavelengths. − In six-wave mixing experiments, there is a possibility that the FWM signal from the first three pulses cascades with the two additional pulses to create a cascaded FWM signal.…”

Section: Local Field Induced Signalsmentioning

confidence: 99%

Ultrafast Nonlinear Spectroscopic Techniques in the Gas Phase and Their Density Matrix Representation

et al. 2002

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We survey the possible time-resolved three pulse nonlinear spectroscopic techniques and their application to gas-phase samples. The role of each of the interacting electric fields is specified, and the nature of the signal is interpreted using the density matrix representation. Simulations of these nonlinear optical signals are based on the perturbative solution of the Liouville equation for the density matrix to third order in the applied fields. We present closed expressions for the integrated and frequency dispersed signals that identify the type of molecular response for each technique and give the signal dependence on the various time delays between laser pulses. We choose a simple experimental system, two-electronic states coupled to a single vibrational mode of diatomic iodine, with weak dephasing, to illustrate various molecular polarization responses in fourwave mixing experiments including pump-probe, reverse transient grating, and photon echo. These signals and their simulations illustrate how the time delays between pulses can be effectively used to control the optical response of the molecular system.

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