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Multiphoton pi pulses.

George N Gibson1

  • 1Department of Physics, University of Connecticut, Storrs, Connecticut 06269, USA.

Physical Review Letters
|December 18, 2002
PubMed
Summary
This summary is machine-generated.

Multiphoton excitation is enhanced in a three-level system, enabling efficient multiphoton pi pulses. This approach overcomes limitations of two-level systems, paving the way for new applications in VUV generation and ionization.

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Nonlinear optics

Background:

  • Multiphoton excitation in two-level systems is inefficient due to weak coupling, Stark shifts, and ionization.
  • These limitations hinder practical applications of multiphoton processes.

Purpose of the Study:

  • To investigate a three-level system for enhanced multiphoton excitation.
  • To demonstrate the feasibility of generating multiphoton pi pulses.
  • To explore potential applications in vacuum ultraviolet (VUV) generation and ionization.

Main Methods:

  • Theoretical analysis of a three-level atomic system.
  • Calculation of multiphoton coupling strengths and ac Stark shifts.
  • Two-electron model potential calculations including ionization effects.

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Main Results:

  • A three-level system significantly reduces ac Stark shifts and enhances multiphoton coupling.
  • Demonstration of a 12-photon pi pulse driven by 800-nm photons.
  • Calculations confirm the feasibility of generating intense multiphoton pulses.

Conclusions:

  • The proposed three-level configuration overcomes limitations of two-level systems for multiphoton excitation.
  • This system shows promise for creating amplifying media in the VUV.
  • Potential applications include multiphoton adiabatic passage and inner-shell ionization.