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Dark-line atomic resonances in submillimeter structures.

Svenja Knappe1, Leo Hollberg, John Kitching

  • 1Time and Frequency Division, National Institute of Standards and Technology, Boulder, Colorado 80305, USA. knappe@boulder.nist.gov

Optics Letters
|February 20, 2004
PubMed
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We measured dark-line resonances in cesium atoms within small, submillimeter cells. Despite reduced atomic Q factors due to wall collisions, coherent population trapping resonances maintain contrast, though higher laser intensity is needed at increased buffer-gas pressures.

Area of Science:

  • Atomic physics
  • Quantum optics
  • Laser spectroscopy

Background:

  • Submillimeter cells are crucial for miniaturizing atomic devices.
  • Understanding atom-surface interactions is key for device performance.
  • Buffer gases influence atomic interactions and resonance properties.

Purpose of the Study:

  • To investigate dark-line resonances in cesium atoms within submillimeter cells.
  • To measure the impact of cell size and buffer gas on resonance width and contrast.
  • To analyze the trade-offs between laser intensity, buffer gas pressure, and resonance characteristics.

Main Methods:

  • Excitation of dark-line resonances in cesium atoms confined in submillimeter cells.
  • Measurement of resonance width and contrast for cell lengths down to 100 microm.

Related Experiment Videos

  • Systematic variation of buffer gas pressure and laser intensity.

    • Main Results:

    • Atomic Q factors decrease in smaller cells due to increased atom-wall collisions.
    • Coherent population trapping resonance contrast remains comparable to larger cells.
    • Higher laser intensity is required at elevated buffer-gas pressures for full resonance excitation.
    • Intensity broadening effects on linewidth are mitigated by decreasing intensity broadening rates with buffer-gas pressure.

    Conclusions:

    • Miniaturized atomic cells can maintain significant resonance contrast despite reduced Q factors.
    • Optimizing laser intensity and buffer gas pressure is essential for high-contrast resonances in small cells.
    • These findings are relevant for the development of compact atomic sensors and devices.