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Related Experiment Videos

Enhanced high harmonic generation from an optically prepared excited medium.

P M Paul1, T O Clatterbuck, C Lyngå

  • 1Chemistry Department, Brookhaven National Laboratory, Upton, NY 11973, USA.

Physical Review Letters
|May 21, 2005
PubMed
Summary

We observed significant increases in high harmonic generation from rubidium atoms. Excited states, particularly the 4d state, unexpectedly boosted harmonic yields compared to the ground state.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Nonlinear Optics

Background:

  • High harmonic generation (HHG) is a key process in nonlinear optics.
  • Understanding HHG from excited states is crucial for advanced light sources.

Purpose of the Study:

  • Investigate HHG enhancement in rubidium atoms.
  • Determine the role of excited states in HHG yield.

Main Methods:

  • Simultaneous irradiation of rubidium atoms.
  • Using a 3.5 micrometer fundamental field and a weak CW diode laser.
  • Analyzing harmonic yields from ground and excited states (5p, 5d, 4d).

Main Results:

  • Orders-of-magnitude increase in harmonic yield observed.

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  • Significant enhancement linked to populated excited states.
  • The 4d excited state alone is responsible for the unexpected enhancement.

    • Conclusions:

    • Excited state population dramatically influences HHG.
    • The 4d state plays a critical, unexpected role in HHG enhancement.
    • Potential for tailored HHG using excited state manipulation.