Abstract
A rotationally resolved excitation spectrum of the A 2Σ +−X 2Π 3 2 transition of nitric oxide was observed by use of the two-photon degenerate four-wave mixing (TP-DFWM) process. It was found that the peak positions in the TP-DFWM spectrum are blue-shifted by 0.5 cm −1 compared to corresponding rotational lines in the two-photon laser-induced fluorescence excitation spectrum. From the dependence of the TP-DFWM signal intensity upon the polarization of the input laser fields, the mechanism for the generation of the phase-conjugate beam is discussed.
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