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Protecting and accelerating adiabatic passage with time-delayed pulse sequences.

Pablo Sampedro1, Bo Y Chang, Ignacio R Sola

  • 1Departamento de Química Física, Universidad Complutense, 28040 Madrid, Spain. isola@quim.ucm.es.

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Summary
This summary is machine-generated.

Numerical simulations reveal that time-delayed femtosecond laser pulses can prevent saturation in sodium dimer (Na2) two-photon absorption. This method also accelerates adiabatic passage and enables state-selective transitions using vibrational coherence.

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Area of Science:

  • Quantum optics
  • Physical chemistry
  • Computational physics

Background:

  • Two-photon absorption (TPA) in molecules like Na2 is often limited by saturation and Rabi oscillations.
  • Controlling molecular excitation dynamics with ultrashort laser pulses is crucial for advanced applications.

Purpose of the Study:

  • To investigate methods for controlling TPA dynamics in Na2 using femtosecond laser pulses.
  • To explore the use of time-delayed pulses and vibrational coherence to optimize excitation pathways.

Main Methods:

  • Numerical simulations of two-photon electronic absorption.
  • Modeling the interaction of femtosecond laser pulses with Na2 molecules.
  • Analysis of Rabi oscillations, saturation effects, and adiabatic passage dynamics.

Main Results:

  • Time-delaying laser pulses effectively suppresses saturation and Rabi oscillations in TPA yield.
  • Utilizing vibrational coherence from wave packets accelerates the onset of adiabatic passage.
  • Preparation of initial wave packets allows for state-selective transitions with broadband pulses.

Conclusions:

  • Femtosecond laser pulse shaping offers precise control over molecular excitation.
  • Ultrafast adiabatic passage can be achieved robustly using light-induced potentials.
  • These findings have implications for ultrafast chemistry and quantum control.