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Related Experiment Video

Updated: Jun 22, 2026

Characterizing Far-infrared Laser Emissions and the Measurement of Their Frequencies
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Published on: December 18, 2015

Prospects for a millihertz-linewidth laser.

D Meiser1, Jun Ye, D R Carlson

  • 1JILA, National Institute of Standards and Technology, and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA.

Physical Review Letters
|June 13, 2009
PubMed
Summary

We developed a novel light source using alkaline-earth atoms in an optical lattice. This generates ultra-narrow linewidth radiation, significantly enhancing atomic clock stability.

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Area of Science:

  • Atomic Physics
  • Quantum Optics
  • Metrology

Background:

  • Atomic clocks rely on ultra-narrow spectral transitions for precision.
  • Existing light sources face limitations in linewidth and stability.
  • Optical cavities enhance light-matter interaction and spectral purity.

Purpose of the Study:

  • To propose a new light source with an ultra-narrow linewidth.
  • To leverage collective atomic effects for enhanced optical radiation.
  • To improve the stability of state-of-the-art atomic clocks.

Main Methods:

  • Utilizing alkaline-earth atoms within an optical lattice.
  • Inducing collective photon emission on an ultranarrow clock transition.
  • Coupling the emitted photons to a high Q optical resonator.

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Last Updated: Jun 22, 2026

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Main Results:

  • Generation of optical radiation with an ultra-narrow linewidth (mHz range).
  • Linewidth narrower than the atomic clock transition due to collective effects.
  • Achievable power levels of ~10^-12 W, suitable for phase locking.

Conclusions:

  • The proposed light source offers unprecedented spectral purity.
  • Potential to improve atomic clock stability by two orders of magnitude.
  • Enables advancements in fundamental metrology and precision measurements.