Abstract
We have considered an analytical control of two-photon absorption process of atoms in the strong-field interaction regime. The experiment was performed on gaseous cesium atoms strongly interacting with a shaped laser-pulse from a femtosecond laser amplifier and a programmable pulse-shaper. When this shaped laser-pulse transfers the atomic population from the 6s ground state to the 8s excited state, we have found that both positively- and negatively-chirped laser pulses, compared with a Gaussian pulse, enhance this excitation in the strong-field regime of laser-atom interaction. This unusual phenomena is explained because the temporal shape of the laser intensity compensates the effect of dynamic Stark shift for the two-photon resonant condition to be optimally maintained. We provide analytic calculations using the strong-field phase matching, which show good agreement with the experiment.
Highlights
IntroductionCoherent control of a quantum system enables an involving nonlinear optical process to be optimized or steered through a desirable quantum path [1, 2]
Coherent control of a quantum system enables an involving nonlinear optical process to be optimized or steered through a desirable quantum path [1, 2]. This beautiful way of handling a quantum mechanical object was considered in early days to break chemical bonds, with a laser pulse pair [3], or with interference between continuous wave lasers [4]
The field of coherent control has been of significant interest in using shaped ultrafast pulses for the control of atomic and molecular dynamics [7, 8, 9, 10], even in condensed matter phase [11]
Summary
Coherent control of a quantum system enables an involving nonlinear optical process to be optimized or steered through a desirable quantum path [1, 2]. This beautiful way of handling a quantum mechanical object was considered in early days to break chemical bonds, with a laser pulse pair [3], or with interference between continuous wave lasers [4]. An optimal control theory with feedback algorithms was used to deal with complicated light-matter interactions [5]. The programming and maintaining the phase information contained in both the light and matter are central to the success of the control. The field of coherent control has been of significant interest in using shaped ultrafast pulses for the control of atomic and molecular dynamics [7, 8, 9, 10], even in condensed matter phase [11]
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