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Controlling Quantum Interference between Virtual and Dipole Two-Photon Optical Excitation Pathways Using Phase-Shaped

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  • 1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, United States.

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Researchers enhanced two-photon excitation (TPE) fluorescence by controlling quantum interference between excitation pathways using shaped laser pulses. This quantum control offers potential for improved two-photon microscopy and novel spectroscopic techniques.

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Area of Science:

  • Physical Chemistry
  • Quantum Optics
  • Spectroscopy

Background:

  • Two-photon excitation (TPE) involves virtual and dipole pathways, especially in non-centrosymmetric molecules.
  • Controlling quantum interference between these pathways is crucial for optimizing TPE processes.

Purpose of the Study:

  • To investigate the quantum control of TPE via interference between virtual and dipole pathways.
  • To enhance two-photon-excited fluorescence using phase-shaped femtosecond laser pulses.

Main Methods:

  • Utilized phase-shaped femtosecond laser pulses to control quantum interference.
  • Measured two-photon-excited fluorescence of photobase FR0-SB in methanol.
  • Performed simulations accounting for pathway responses and pulse shaping effects.

Main Results:

  • Achieved fluorescence enhancements up to 1.75 by controlling quantum interference.
  • Simulations showed good agreement with experimental measurements.
  • Demonstrated effective quantum control of TPE in the condensed phase.

Conclusions:

  • Quantum control of TPE pathways can significantly enhance fluorescence signals.
  • Potential applications include improved two-photon microscopy and novel spectroscopic methods.
  • Findings highlight the importance of controlling optical excitation pathways for advanced photonic applications.