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Related Experiment Video

Updated: Jun 17, 2026

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

Diffraction-Limited GaAs Laser with External Resonator.

E M Phillip-Rutz, H D Edmonds

    Applied Optics
    |January 15, 2010
    PubMed
    Summary
    This summary is machine-generated.

    This study demonstrates that a gallium arsenide (GaAs) injection laser with an external resonator can achieve diffraction-limited radiation. This setup significantly increases the laser

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers

    Background:

    • Gallium arsenide (GaAs) injection lasers are crucial semiconductor devices.
    • Achieving diffraction-limited output from semiconductor lasers is a key challenge.
    • External resonators can modify laser beam characteristics.

    Purpose of the Study:

    • To investigate the use of an external resonator to achieve diffraction-limited radiation from a GaAs injection laser.
    • To analyze the transverse mode properties and output power of the modified laser.

    Main Methods:

    • Operating a 185-micrometer wide GaAs injection laser with an external resonator.
    • Measuring the far-field radiation pattern and power output at room temperature.
    • Analyzing the symmetry of the external resonator and the absence of mode-selecting irises.

    Main Results:

    • The laser achieved diffraction-limited radiation, primarily in the lowest order transverse mode across the p-n junction width.
    • Peak radiated power reached 2.2 W with an external quantum efficiency of 0.031.
    • The external resonator, despite the asymmetrical junction, enhanced radiance by over an order of magnitude.

    Conclusions:

    • External resonators are effective in achieving high-quality, diffraction-limited beams from GaAs injection lasers.
    • The spherical symmetry of the resonator plays a role in mode selection without irises.
    • This method offers a significant improvement in laser radiance for various applications.