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Journal of the Korean Physical Society

Dynamic Shift and Population Inversion in Single-Color, Two-Step, Three-Photon Ionization by a Gaussian-Pulse Laser

A. S. Choe, Do-Young Jeong, Hyunmin Park, Yongjoo Rhee, Jongmin Lee

Published Jul 1, 1995• 0 citations
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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.