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Optics Communications

Population transfer through the continuum using laser-controlled Stark shifts

Леонід Петрович Яценко, Razmik G. Unanyan, Klaas Bergmann, Thomas Halfmann, Bruce W. Shore

Published Feb 1, 1997• 66 citations
Publisher
DOI
10.1016/s0030-4018(96)00630-x

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Traditional two-photon excitation suffers from two difficulties that prevent complete population transfer: dynamic Stark shifts and multiphoton ionization. We describe a technique for overcoming these limitations by using a second field to control dynamic Stark shifts via Stark-chirped rapid adiabatic passage (SCRAP) and simultaneously suppress undesired photoionization via laser-induced continuum structure (LICS). We illustrate this proposed procedure by numerical simulations of two-photon excitation of the metastable 2s2s2s state of hydrogen, showing that efficient excitation can be expected when the two laser pulses are properly crafted.
We show that coherent control of multiphoton transitions is possible in the strong field limit, even in the presence of large dynamic Stark shifts. By tailoring the phase of an ultrafast laser pulse, one can compensate for the dynamic Stark shift during the atom-field interaction to achieve efficient population transfer in two-photon absorption. Numerical simulations for atomic sodium reveal efficient population transfer from the $\ensuremath{\mid}3s⟩$ ground state to the $\ensuremath{\mid}4s⟩$ excited state using an appropriately shaped ultrafast laser pulse. The theory and simulations provide insight into coherent control of more complicated multiphoton processes.