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Updated: Mar 18, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
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Tunable narrow linewidth AlGaInP semiconductor disk laser for Sr atom cooling applications.

David Pabœuf, Jennifer E Hastie

    Applied Optics
    |July 14, 2016
    PubMed
    Summary

    We developed a frequency-stabilized semiconductor disk laser at 689 nm for strontium atomic clocks. This laser offers over 100 mW power, 8 nm tuning range, and low frequency noise for precise timekeeping.

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    Area of Science:

    • Atomic Physics
    • Laser Technology
    • Quantum Metrology

    Background:

    • Precise atomic clocks are crucial for fundamental physics research and timekeeping.
    • Strontium atoms are promising candidates for next-generation atomic clocks due to their narrow optical transitions.
    • Stable and tunable laser sources are essential for interrogating atomic transitions with high precision.

    Purpose of the Study:

    • To develop a frequency-stabilized semiconductor disk laser operating at 689 nm.
    • To achieve high output power and precise tunability for strontium atomic clock applications.
    • To demonstrate low frequency noise for enhanced clock stability.

    Main Methods:

    • Utilized an AlGaInP semiconductor disk laser designed for emission around 690 nm.

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  • Achieved single-frequency operation with a gain structure optimization.
  • Implemented a frequency stabilization technique by servo-locking to a reference cavity's side fringe.
  • Characterized laser output power, tuning range, and frequency noise.

    • Main Results:

    • Generated over 100 mW of output power in single-frequency operation.
    • Demonstrated a tunable laser source with an 8 nm tuning range and picometer precision.
    • Achieved root-mean-square (rms) frequency noise of 5.2 kHz through servo-locking.

    Conclusions:

    • The developed semiconductor disk laser meets key requirements for strontium atomic clocks.
    • The laser's performance, including power, tunability, and frequency stability, is suitable for advanced atomic clock development.
    • This work contributes a valuable tool for advancing optical atomic clock technology.