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Observing Rydberg atoms to survive intense laser fields.

U Eichmann1, A Saenz2, S Eilzer3

  • 1Max-Born Institut, D-12489 Berlin, Germany and Institut für Optik und Atomare Physik, Technische Universität Berlin, D-10623 Berlin, Germany.

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Physicists observed Rydberg atoms resisting ionization in ultrastrong laser fields, exceeding static field ionization thresholds by six orders of magnitude. Surviving atoms are tagged with laser intensity data, enabling relativistic regime studies.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Strong Field Physics

Background:

  • Theoretical studies on atom stabilization in strong laser fields have spanned three decades.
  • Experimental investigations have been limited to intermediate laser intensities, leaving high-intensity phenomena largely unexplored.

Purpose of the Study:

  • To experimentally demonstrate the exceptional stability of Rydberg atoms in ultrastrong laser fields.
  • To extend the observation range of atomic stabilization to significantly higher laser intensities.
  • To develop a method for measuring the laser intensity experienced by stabilized atoms.

Main Methods:

  • Utilizing Rydberg atoms subjected to ultrastrong laser fields with amplitudes exceeding 1 GV/cm.
  • Analyzing the survival of atoms after laser field interaction.
  • Developing a technique to 'tag' surviving atoms with information about the laser intensity encountered.

Main Results:

  • Exceptional stability of Rydberg atoms observed in laser fields far exceeding static field ionization thresholds (by >6 orders of magnitude).
  • A novel finding: surviving atoms inherently carry a measure of the laser intensity they were exposed to.
  • Experimental validation of atomic stabilization at unprecedentedly high laser intensities.

Conclusions:

  • The study confirms and extends the understanding of atomic stabilization in ultrastrong laser fields.
  • The intensity-tagging mechanism provides crucial verification for high-intensity experimental results.
  • Findings pave the way for exploring the relativistic regime of electron-strong field interactions.