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Optical detection of tunneling ionization.

Aart J Verhoef1, Alexander V Mitrofanov, Evgenii E Serebryannikov

  • 1Photonics Institute, Vienna University of Technology, Gusshausstrasse 27-29/387, A-1040, Vienna, Austria.

Physical Review Letters
|May 21, 2010
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Researchers detected optical harmonics from electron tunneling, offering a new method for attosecond metrology. This optical signal detection bypasses the need for direct charged particle measurement, useful for complex systems.

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Area of Science:

  • * Quantum optics and attosecond science.
  • * Nonlinear optics and electron dynamics.

Background:

  • * Attosecond metrology traditionally relies on detecting charged particles, limiting its application in certain systems.
  • * Electron tunneling ionization is a fundamental process in strong-field physics.

Purpose of the Study:

  • * To experimentally detect optical harmonics generated by tunneling ionization.
  • * To develop a background-free optical detection method for electron tunneling dynamics.
  • * To offer an alternative to charged particle detection in attosecond metrology.

Main Methods:

  • * Utilized a noncollinear pump-probe spectroscopy setup.
  • * Generated and detected optical harmonics resulting from laser-induced electron density modulation.
  • * Isolated the optical signature of electron tunneling from other optical responses.

Main Results:

  • * Successfully detected optical harmonics originating from tunneling ionization.
  • * Demonstrated the isolation of the electron tunneling signal using the noncollinear pump-probe technique.
  • * Achieved background-free detection of time-resolved optical signals.

Conclusions:

  • * Optical harmonic generation provides a viable pathway for studying electron tunneling.
  • * The developed method offers a novel, non-invasive approach for attosecond metrology.
  • * This technique is particularly advantageous for systems where direct electron detection is challenging or impossible.