Pulse-train control of multiphoton transitions in anharmonic progressions: Resonance loci and resonance ridges

Seidl, Markus; Uiberacker, C.; Jakubetz, Werner

doi:10.1016/j.chemphys.2008.02.058

Cited by 3 publications

(4 citation statements)

References 41 publications

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“…Recent progress has allowed the development of modelocked laser systems producing mutually phase-coherent ultrashort laser pulses of high intensity with arbitrary controllable amplitudes, of stable frequency and of adjustable delay time (see for instance [23,24]). Theoretical [25][26][27] and experimental [28,29] analysis in a few level systems have shown that a resonant π-pulse (or generalized π-pulse [11,12]) can be split into trains of fractional π-pulses and can lead to the accumulation of population in a target state for appropriate delays. The main point is * Electronic address: anahit.gogyan@u-bourgogne.fr that weak pulses can then be used preventing detrimental destructive effects such as ionization.…”

Section: Introductionmentioning

confidence: 99%

“…Theoretical [25][26][27] and experimental [28,29] analysis in a few level systems have shown that a resonant π-pulse (or generalized π-pulse [11,12]) can be split into trains of fractional π-pulses and can lead to the accumulation of population in a target state for appropriate delays. The main point is * Electronic address: anahit.gogyan@u-bourgogne.fr that weak pulses can then be used preventing detrimental destructive effects such as ionization.…”

Section: Introductionmentioning

confidence: 99%

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Shaping coherent excitation of atoms and molecules by a train of ultrashort laser pulses

Gogyan¹,

Guérin²,

Malakyan³

2010

Phys. Rev. A

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We propose a mechanism to produce a superposition of atomic and molecular states by a train of ultrashort laser pulses combined with weak control fields. By adjusting the repetition rate of the pump pulses and the intensity of the coupling laser, one can suppress a transition, while simultaneously enhancing the desired transitions. As an example various superpositions of states of the K2 molecule are shown.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Shaping coherent excitation of atoms and molecules by a train of ultrashort laser pulses

Gogyan¹,

Guérin²,

Malakyan³

2010

Phys. Rev. A

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“…As discussed below, the difference between the two solutions is manifest when the target wave packet consists of more than two eigenstates. Our method is also related to the coherent accumulation of transition amplitudes driven by a train of laser pulses [1,4,47,48,49,50,51,52], but the robustness is a unique property of PAP. This paper is organized as follows: In Section II, we present the theory in the frequency space and illustrate it via numerical studies of population transfer in sodium dimers.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Complete transfer of populations from a single state to a preselected superposition of states using piecewise adiabatic passage: Theory

2009

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We develop a method for executing robust and selective transfer of populations between a single level and pre-selected superpositions of energy eigenstates. Viewed in the frequency domain, our method amounts to executing a series of simultaneous adiabatic passages into each component of the target superposition state. Viewed in the time domain, the method works by accumulating the wavefunction of the target wave packet as it revisits the Franck Condon region, in what amounts to an extension of the Piecewise Adiabatic Passage technique [ Shapiro et.al., Phys. Rev. Lett. 99, 033002 (2007)] to the multi-state regime. The viability of the method is verified by performing numerical tests for the Na2 molecule.

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Pulse-train control of branching processes: Elimination of background and intruder state population

Seidl

Etinski

Uiberacker

et al. 2008

The Journal of Chemical Physics

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The authors introduce and describe pulse train control (PTC) of population branching in strongly coupled processes as a novel control tool for the separation of competing multiphoton processes. Control strategies are presented based on the different responses of processes with different photonicities and/or different frequency detunings to the pulse-to-pulse time delay and the pulse-to-pulse phase shift in pulse trains. The control efficiency is further enhanced by the property of pulse trains that complete population transfer can be obtained over an extended frequency range that replaces the resonance frequency of simple pulses. The possibility to freely tune the frequency assists the separation of the competing processes and reduces the number of subpulses required for full control. As a sample application, PTC of leaking multiphoton resonances is demonstrated by numerical simulations. In model systems exhibiting sizable background (intruder) state population if excited with single pulses, PTC leading to complete accumulation of population in the target state and elimination of background population is readily achieved. The analysis of the results reveals different mechanisms of control and provides clues on the mechanisms of the leaking process itself. In an alternative setup, pulse trains can be used as a phase-sensitive tool for level switching. By changing only the pulse-to-pulse phase shift of a train with otherwise unchanged parameters, population can be transferred to any of two different target states in a near-quantitative manner.

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Pulse-train control of multiphoton transitions in anharmonic progressions: Resonance loci and resonance ridges

Cited by 3 publications

References 41 publications

Shaping coherent excitation of atoms and molecules by a train of ultrashort laser pulses

Shaping coherent excitation of atoms and molecules by a train of ultrashort laser pulses

Complete transfer of populations from a single state to a preselected superposition of states using piecewise adiabatic passage: Theory

Pulse-train control of branching processes: Elimination of background and intruder state population

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