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Subnatural Linewidth Superradiant Lasing with Cold ^{88}Sr Atoms.

Sofus Laguna Kristensen1, Eliot Bohr1, Julian Robinson-Tait1

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Summary
This summary is machine-generated.

Superradiant lasers, using collective atomic effects, achieve ultra-narrow linewidths. This study demonstrates steady-state superradiance in ultracold strontium atoms, nearing continuous laser performance with significantly reduced linewidths.

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Area of Science:

  • Atomic physics
  • Quantum optics
  • Laser technology

Background:

  • Superradiant lasers utilize collective atomic effects for enhanced coherence.
  • They operate in the bad-cavity regime, storing phase information in atomic spin states.
  • Potential for significantly narrower linewidths compared to conventional lasers.

Purpose of the Study:

  • Investigate superradiant lasing properties in ultracold strontium-88 atoms within an optical cavity.
  • Extend superradiant emission duration and achieve steady-state parameters.
  • Explore linewidth reduction capabilities for potential continuous superradiant laser emulation.

Main Methods:

  • Utilized an ensemble of ultracold ^{88}Sr atoms.
  • Employed an optical cavity setup to confine the atomic medium.
  • Fine-tuned repumping rates to achieve steady-state lasing parameters.
  • Measured the lasing linewidth on the ^{3}P_{1}→^{1}S_{0} intercombination line.

Main Results:

  • Extended superradiant emission to several milliseconds.
  • Observed steady parameters enabling emulation of continuous superradiant laser performance.
  • Achieved a lasing linewidth of 820 Hz over 1.1 ms of operation.
  • Demonstrated linewidth reduction nearly an order of magnitude below the natural linewidth.

Conclusions:

  • Superradiant lasers in ultracold atoms offer a pathway to ultra-narrow linewidths.
  • Steady-state operation is achievable by controlling repumping rates.
  • This work paves the way for advanced applications requiring highly coherent light sources.