Autler-Townes effect in a sodium molecular-ladder scheme

Details Autler-Townes effect in a sodium molecular-ladder scheme Autler-Townes effect in a sodium molecular-ladder scheme

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005phrva..71b3401g&link_type=abstract

Physical Review A, vol. 71, Issue 2, id. 023401

Physics

16

Strong-Field Excitation Of Optical Transitions In Quantum Systems, Multiphoton Processes, Dynamic Stark Shift, Photon Interactions With Molecules, Multiple Resonances, Oscillator And Band Strengths, Lifetimes, Transition Moments, And Franck-Condon Factors

Scientific paper

We report results from studies of the Autler-Townes (AT) effect observed in sodium molecules from a molecular beam. A relatively weak laser field P couples an initially populated rovibronic level g in the electronic ground state (here X 1Σ+g , v″ =0 , J″ =7 ) to a selected excited rovibronic level e (here A 1Σ+u , v' =10 , J' =8 ), which in turn is coupled by a relatively strong laser field S to a more highly excited level f (here 5 1Σ+g ,v=10 , J=9 ), a scheme we idealize as a three-state ladder. The AT effect is seen by scanning the frequency of the P field while recording fluorescence from both the e and f levels in separate detection channels. We present qualitative theoretical considerations showing that, when the P field is weak, the ratio of doublet component areas in the excitation spectrum from level f can be used to determine the lifetime of this level. We obtain a value of 17±3 ns . When the P field is stronger, such that its Rabi frequency is larger than the decay rate of level e , the fraction of f -level population that decays to the intermediate electronic state A 1Σ+u can be deduced from the AT spectrum. When supplemented with values of Franck-Condon and Hönl-London factors, our measurements give a value for the branching ratio (the fraction returning to level e ) of re =0.145 with a statistical error of ±0.004 . The use of a strong P field on the g-e transition and a weak S field as a probe on the e-f transition results in complex line shapes in the excitation spectrum of level f , not showing the familiar Autler-Townes doublet structure.

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