Consequences of optical pumping and interference for excitation spectra in a coherently driven molecular ladder system

N Bezuglov, R Garcia-Fernandez, A Ekers, K Miculis, L Yatsenko, K Bergmann

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3 Citations (Scopus)


This paper presents observations and an interpretation of laser-induced excitation and fluorescence in a ladder g-e-f of three molecular levels [X 1Σg+(v″=0,J″=7), A 1Σu+(v′=10,J′=8), and 5 1Σg+(v=10,J=9), respectively] observed in a supersonic molecular beam of Na2. The g-e coupling, by cw laser P, is strong. A weak cw laser S couples levels e and f. The basic observations are of level-f fluorescence as a function of the detuning of the S laser from resonance. The signal profile does not appear as the typical Autler-Townes doublet, but as a spectral structure, whose position, width, and shape depend upon several laser parameters. We interpret these results using a simple model of three nondegenerate quantum states coherently excited while undergoing population loss to states outside the three-level system. We invoke the mechanism of optical pumping and evolution along adiabatic states, together with Landau-Zener transition probabilities. We also present results from numerical studies, which include all quant
Original languageUndefined
Pages (from-to)053804_1-9
JournalPhysical Review A - Atomic, Molecular, and Optical Physics
Issue number5
Publication statusPublished - 2008

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