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Gain narrowing in few-atom systems.

Tom Savels1, Allard P Mosk, Ad Lagendijk

  • 1FOM Institute for Atomic and Molecular Physics, Kruislaan 407, 1098 SJ, Amsterdam, The Netherlands. t.savels@amolf.nl

Physical Review Letters
|March 16, 2007
PubMed
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We studied simple atomic clusters (2-5 atoms) to understand gain and feedback, observing significant gain narrowing and spectral changes. This research presents the simplest solvable model approaching laser oscillation.

Area of Science:

  • Quantum optics
  • Atomic physics
  • Laser physics

Background:

  • Understanding laser oscillation requires studying systems with gain and feedback.
  • Microscopic models are crucial for fundamental insights into light-matter interactions.

Purpose of the Study:

  • To investigate the simplest exactly solvable microscopic systems exhibiting gain and feedback.
  • To analyze the effects of near-field interactions and light scattering on spectral properties.
  • To explore the conditions leading to laser oscillation in small atomic clusters.

Main Methods:

  • Utilizing a density matrix approach for theoretical analysis.
  • Modeling clusters of 2 to 5 pumped and scattering atoms.
  • Investigating light-matter interactions within the atomic near-field.

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Main Results:

  • Observed significant gain narrowing in atomic clusters.
  • Demonstrated spectral mode redistribution due to multiple light scattering.
  • Found that enhanced feedback amplifies these phenomena.
  • Identified the system as the simplest exactly solvable model showing the approach to laser oscillation.

Conclusions:

  • Near-field interactions in small atomic clusters can lead to pronounced optical effects.
  • Multiple scattering of light is a key mechanism for feedback in these systems.
  • The studied model provides fundamental insights into the onset of laser oscillation.