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Light absorption by interacting atomic gas in quantum optical regime.

Andrii S Sizhuk1, Konstantin Dorfman2, C H Raymond Ooi3

  • 1Department of Radiophysics, Kyiv National Taras Shevchenko University, Acad. Glushkova Avenue 4-g, Kyiv 03022, Ukraine.

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This study introduces local absorptance to analyze quantum optical absorption in interacting atoms. It develops a method accounting for atomic motion, Doppler effect, and quantum field interactions.

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Area of Science:

  • Quantum Optics
  • Atomic Physics
  • Condensed Matter Theory

Background:

  • Understanding light-matter interactions is crucial in quantum optics.
  • Existing models often simplify atomic interactions and the quantum nature of light.
  • A comprehensive theory for absorption in interacting atomic systems is needed.

Purpose of the Study:

  • To develop a quantum optical theory for the absorption properties of interacting atoms.
  • To introduce and define the concept of local absorptance.
  • To propose an analytical method for estimating kinetic and optical parameters.

Main Methods:

  • Developed a quantum optical theory for absorption.
  • Introduced local absorptance as a derivative of intensity.
  • Formulated an analytical method for absorption coefficient calculation.
  • Incorporated thermal atomic motion, Doppler effect, and inter-atomic interactions.
  • Accounted for the quantum nature of the optical field and interaction integrals.

Main Results:

  • The absorption coefficient explicitly includes quantum optical field effects.
  • Interaction integrals quantitatively express the system's ability to absorb or emit quanta.
  • Simulated spectral profiles of local absorption coefficient for varying atomic densities and time intervals.

Conclusions:

  • The interplay of collective and binary processes governs system behavior.
  • The developed theory provides a quantitative description of absorption in interacting atomic systems.
  • Simulations offer insights into absorption characteristics under realistic conditions.