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Strong field coherent control of atomic population transfer

Carlos Trallero-Herrero1,2, Stephen D Clow1, Thomas Bergeman1 and Thomas Weinacht1

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We 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.


PACS

32.80.Xx Level crossing and optical pumping

42.50.Hz Strong-field excitation of optical transitions in quantum systems; multiphoton processes; dynamic Stark shift

32.80.Rm Multiphoton ionization and excitation to highly excited states

32.50.+d Fluorescence, phosphorescence (including quenching)

Subjects

Atomic and molecular physics

Optics, quantum optics and lasers

Dates

Issue 7 (14 April 2008)

Received 25 October 2007, in final form 16 December 2007

Published 25 March 2008



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