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Related Experiment Videos

Controlling two-center interference in molecular high harmonic generation.

C Vozzi1, F Calegari, E Benedetti

  • 1Dipartimento di Fisica, Politecnico, National Laboratory for Ultrafast and Ultraintense Optical Science-CNR-INFM, Milano, Italy.

Physical Review Letters
|October 26, 2005
PubMed
Summary
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We observed intramolecular quantum interference in high-order harmonic generation of carbon dioxide (CO2) molecules. This quantum interference can be controlled by adjusting the laser field

Area of Science:

  • Quantum optics
  • Molecular physics
  • Attosecond science

Background:

  • High-order harmonic generation (HHG) is a key process for creating ultrashort light pulses.
  • Intramolecular quantum interference plays a crucial role in HHG dynamics.
  • Controlling molecular alignment is essential for manipulating HHG

Purpose of the Study:

  • To experimentally investigate intramolecular quantum interference in HHG.
  • To understand the role of molecular alignment in HHG.
  • To demonstrate control over quantum interference in HHG using laser ellipticity.

Main Methods:

  • Experimental setup for high-order harmonic generation.
  • Impulsive alignment of carbon dioxide (CO2) molecules.
  • Varying the ellipticity of the driving laser field.

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Main Results:

  • Observed clear signatures of recombination interference in the harmonic yield.
  • Harmonic yield showed distinct order dependence in aligned CO2 molecules.
  • Experimental data were well-modeled by assuming the Coulomb field minimally affects the electron's de Broglie wavelength.

Conclusions:

  • Intramolecular quantum interference is a significant factor in HHG of aligned CO2.
  • The Coulomb field's effect on the returning electron's de Broglie wavelength is negligible in this regime.
  • Laser ellipticity provides an effective means to control quantum interference effects in HHG.