Abstract
The population trapping in highly excited atomic states under intense femtosecond Ti:sapphire transform limited and chirped laser pulse action is studied. It is demonstrated that trapping appears as a result of the multiphoton resonance between the initial ground state and a set of excited states near the continuum boundary accompanied by repopulation of the Rydberg states by the Raman Λ-type transitions via the continuum and the interference stabilization. The specific features of the population trapping in both positively and negatively chirped pulses are analyzed and discussed.
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