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Related Experiment Videos

Femtosecond phase-coherent two-dimensional spectroscopy.

Peifang Tian1, Dorine Keusters, Yoshifumi Suzaki

  • 1Department of Electrical Engineering, Center of Ultrafast Laser Applications, Princeton University, Princeton, NJ 08544, USA.

Science (New York, N.Y.)
|June 7, 2003
PubMed
Summary

Femtosecond phase-coherent two-dimensional spectroscopy, an optical analog to 2D NMR, was demonstrated. This technique uses controlled laser pulses to study ultrafast molecular dynamics.

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Area of Science:

  • Quantum Optics
  • Spectroscopy
  • Physical Chemistry

Background:

  • Two-dimensional (2D) spectroscopy is a powerful technique for studying molecular dynamics.
  • Femtosecond laser systems enable the investigation of ultrafast processes.
  • Phase coherence is crucial for detailed dynamic information.

Purpose of the Study:

  • To demonstrate femtosecond phase-coherent two-dimensional (2D) spectroscopy as a direct optical analog of 2D nuclear magnetic resonance (NMR).
  • To develop a method for probing femtosecond structural dynamics of macromolecules.

Main Methods:

  • Utilized an acousto-optic pulse shaper to generate a collinear three-pulse sequence.
  • Controlled interpulse delays and phases with high precision.
  • Employed phase cycling to select the desired nonlinear polarization.

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  • Interacted the pulse sequence with a model atomic system (rubidium vapor).

    • Main Results:

    • Successfully demonstrated femtosecond phase-coherent 2D spectroscopy.
    • Showcased the ability to control pulse sequence parameters (delays and phases).
    • Validated the technique's applicability using rubidium vapor.

    Conclusions:

    • Femtosecond phase-coherent 2D spectroscopy is a viable optical analog to 2D NMR.
    • The developed method offers enhanced capabilities for studying ultrafast structural dynamics.
    • Potential applications include probing dynamics of complex systems like macromolecules.