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Multiphoton coherent control in complex systems.

Debabrata Goswami1

  • 1Indian Institute of Technology, Kanpur 208016, India.

Journal of Optics. B, Quantum and Semiclassical Optics : Journal of the European Optical Society
|March 31, 2007
PubMed
Summary
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Researchers control multiphoton transitions using chirped laser pulses. Taylor series expansion of the pulse phase differentiates between population inversion and self-induced transparency in multilevel systems.

Area of Science:

  • Quantum optics
  • Laser physics
  • Nonlinear optics

Background:

  • Controlling quantum systems with tailored laser pulses is crucial for applications.
  • Multiphoton transitions are fundamental processes in light-matter interactions.
  • Understanding the role of pulse phase in controlling these transitions is key.

Purpose of the Study:

  • To demonstrate control over multiphoton transitions in multilevel systems.
  • To generalize the control mechanism using the instantaneous phase of chirped pulses.
  • To differentiate between population inversion and self-induced transparency.

Main Methods:

  • Generalizing the instantaneous phase of chirped pulses using Taylor series expansion.
  • Analyzing the effect of individual Taylor series terms on a two-level system.

Related Experiment Videos

  • Investigating conditions for applicability to more complex multilevel systems.

    • Main Results:

    • Odd terms in the Taylor expansion of the pulse phase induce population inversion.
    • Even terms in the Taylor expansion lead to self-induced transparency.
    • The findings are valid for multiphoton transitions without lower-order resonance or virtual state dynamics.

    Conclusions:

    • The Taylor series expansion of chirped pulse phase provides a method for controlling multiphoton transitions.
    • This approach allows for selective population inversion or self-induced transparency.
    • The demonstrated control is robust for specific types of multiphoton interactions.