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AIP conference proceedings

Line shapes and collisional effects in resonant degenerate four-wave mixing

Larry A. Rahn, Skip Williams, Richard N. Zare

Published Jan 1, 1995• 0 citations
Publisher
DOI
10.1063/1.47485

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Summary form only given. The collisional potentials of Na and Xe are determined from a four-wave mixing (FWM) experiment. These potentials are shown schematically for large Na-Xe distances, the transition energies of the Na atom approach the unperturbed resonances corresponding to the Na D lines. The Na-Xe diatomic molecular potentials have an avoided level crossing, which can lead to satellite structure in the absorption line shape (ALS). In collisional FWM the intensity of the generated FWM signal is determined by the atomic transition ALS.

Quantum Electronics and Laser Science Conference•Jun 7, 1996•0 citations
Saturation effects in gas-phase degenerate four-wave mixing (DFWM) are investigated for conditions of interest for diagnostic applications in flames and plasmas. In particular, the case in which Doppler and collisional broadening are comparable, as is often the case for flame species such as NO and OH, is investigated. DFWM line shapes and signal intensities are calculated nonperturbatively and compared with high-resolution laser measurements. In the nonperturbative calculations the time-dependent density-matrix equations for a two-level system interacting with three laser fields are integrated directly on a grid of spatial locations along the phase-matching axis. The electric-field amplitude for the DFWM signal is determined by multiplying the time-varying, laser-induced polarization at each grid point by the appropriate phase factor and then by summing over all grid points. The calculations are in excellent agreement with measurements of DFWM line shapes and signal intensities for NO in a buffer gas of He over a wide range of He pressure. Under saturation conditions the pressure dependence of the DFWM signal is reduced greatly compared with the unsaturated case. The signal level is still dependent on the ratio of pure dephasing to quenching collisions, even for saturation conditions. From the standpoint of minimal dependence on collisional processes it appears that operation with pump-laser intensities approximately equal to the saturation intensity is optimal. The dependence of the DFWM line shape and signal intensity on the ratio of probe to pump-laser intensity is also investigated.
Summary form only given. The collisional potentials of Na and Xe are determined from a four-wave mixing (FWM) experiment. These potentials are shown schematically for large Na-Xe distances, the transition energies of the Na atom approach the unperturbed resonances corresponding to the Na D lines. The Na-Xe diatomic molecular potentials have an avoided level crossing, which can lead to satellite structure in the absorption line shape (ALS). In collisional FWM the intensity of the generated FWM signal is determined by the atomic transition ALS.