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Superradiant light scattering from thermal atomic vapors.

Yutaka Yoshikawa1, Yoshio Torii, Takahiro Kuga

  • 1Institute of Physics, University of Tokyo, 3-8-1 Meguro-ku, Komaba, Tokyo 153-8902, Japan. yutaka@phys.c.u-tokyo.ac.jp

Physical Review Letters
|March 24, 2005
PubMed
Summary

Superradiant light scattering in atomic vapors was studied. Superradiant gain depends on atomic cloud shape and number, not quantum degeneracy, and coherence times were measured.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Laser Spectroscopy

Background:

  • Superradiance is a quantum optical phenomenon involving enhanced light emission.
  • Previous studies often focused on condensed or degenerate atomic systems.
  • Understanding superradiance in non-condensed thermal vapors is crucial for quantum technologies.

Purpose of the Study:

  • To experimentally investigate superradiant light scattering in non-condensed, thermal atomic vapors.
  • To determine the factors influencing superradiant gain in such systems.
  • To develop and apply a novel spectroscopic technique for measuring atomic coherence.

Main Methods:

  • Experimental setup for observing superradiant light scattering from thermal atomic vapors.
  • Development of superradiant pump-probe spectroscopy.

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  • Measurement of atomic correlation functions and coherence times.

    • Main Results:

    • Superradiant gain was found to be independent of quantum degeneracy.
    • Gain is solely determined by the atomic cloud's shape and the number of atoms.
    • Doppler-width-limited coherence time was measured, along with a sudden onset of long-lived coherence below the transition temperature.

    Conclusions:

    • Superradiance in thermal atomic vapors is governed by classical geometric and atomic number factors.
    • Superradiant pump-probe spectroscopy provides a sensitive probe of atomic coherence.
    • The observed long-lived coherence below the transition temperature opens new avenues for quantum control and information processing.