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Related Experiment Video

Updated: Dec 25, 2025

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics
09:10

Construction and Characterization of External Cavity Diode Lasers for Atomic Physics

Published on: April 24, 2014

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Diamond sodium guide star laser.

Xuezong Yang, Ondrej Kitzler, David J Spence

    Optics Letters
    |April 3, 2020
    PubMed
    Summary
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    A new diamond Raman laser system generates bright, tunable 589 nm light for atmospheric correction. This laser offers high power and narrow linewidth, crucial for advanced laser guide star applications.

    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Astronomy Instrumentation

    Background:

    • Laser guide stars are essential for adaptive optics, correcting atmospheric turbulence.
    • Existing laser technologies face limitations in power and spectral control for optimal guide star generation.
    • The mesospheric sodium layer is a key target for creating artificial guide stars.

    Purpose of the Study:

    • To develop a novel, high-power, spectrally controlled laser source for mesospheric sodium laser guide stars.
    • To demonstrate a new laser architecture for improved atmospheric scintillation correction.
    • To explore advanced functionalities like time-gating and Larmor frequency enhancement.

    Main Methods:

    • A diamond Raman laser with intracavity second-harmonic generation was designed and tested.

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  • A 1018.4 nm fiber laser was used as the pump source.
  • Cavity length control and pump wavelength tuning were employed for spectral control.

    • Main Results:

    • Achieved 22 W output power at 589 nm with 18.6% diode-to-output efficiency.
    • Demonstrated single longitudinal mode (SLM) operation with a linewidth < 8.5 MHz.
    • Showcased continuous tuning across the Na D line resonance.

    Conclusions:

    • The proposed diamond Raman laser concept is suitable for high-power laser guide star generation.
    • The laser's SLM operation and tunability are advantageous for advanced adaptive optics.
    • This technology has the potential to significantly enhance astronomical observations by mitigating atmospheric effects.