R.R. Jones
Abstract:Resonance-enhanced multiphoton ionization of Sodium has been studied using 150-fsec, 777 nm laser pulses. Modulations in the four-photon ionization yield have been observed as a function of (1) laser intensity and (2) the delay between to temporally separated laser pulses. In both cases, the oscillations can be attributed to time-domain Ramsey interference caused by coherent population transfer between bound states at two or more points in time. The interference fringes observed in the two-pulse experiment can be used as a spectroscopic tool to characterize bound-state redistribution during a single pulse. In addition, extremely large ionization enhancements can be achieved by using multiple, appropriately phased pulses to exploit the coherent bound-state excitation.
Status: Published, Laser Physics 7, 733 (1997).
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