Carlos Trallero-Herrero et al 2008 J. Phys. B: At. Mol. Opt. Phys. 41 074014 doi:10.1088/0953-4075/41/7/074014
Carlos Trallero-Herrero1,2, Stephen D Clow1, Thomas Bergeman1 and Thomas Weinacht1
Show affiliationsWe demonstrate a population inversion in a three-level system via three-photon absorption from a single shaped ultrafast laser pulse. The optimal pulse shape for the inversion is discovered using closed-loop learning control and interpreted via pulse shape parameter scans and numerical integration of the Schrödinger equation. The population inversion is measured using a combination of spontaneous and stimulated emissions. Our results illustrate the importance of dynamic Stark shifts in coherent multi-photon excitation.
32.80.Xx Level crossing and optical pumping
32.80.Rm Multiphoton ionization and excitation to highly excited states
32.50.+d Fluorescence, phosphorescence (including quenching)
Issue 7 (14 April 2008)
Received 25 October 2007, in final form 16 December 2007
Published 25 March 2008
Carlos Trallero-Herrero et al 2008 J. Phys. B: At. Mol. Opt. Phys. 41 074014
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