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Narrowband, high power light from diode lasers.

S Q Shang, H J Metcalf

    Applied Optics
    |June 16, 2010
    PubMed
    Summary
    This summary is machine-generated.

    We demonstrate coherent amplification of a single-stripe diode laser using a 100-mW laser diode array. This technique dramatically narrows the output spectrum and spatial distribution, achieving a single diffraction-limited mode.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Diode lasers are widely used but often suffer from broad spectral output and poor spatial beam quality.
    • Achieving high-power, spectrally narrow, and spatially coherent laser output is crucial for many applications.

    Purpose of the Study:

    • To investigate the coherent amplification of a low-power diode laser using a commercial laser diode array.
    • To assess the spectral and spatial characteristics of the amplified output beam.

    Main Methods:

    • Utilized optical feedback from a Fabry-Perot cavity to spectrally narrow and stabilize the input laser light to <300 kHz.
    • Employed a 100-mW continuous-wave (cw) laser diode array for amplification.
    • Analyzed the amplified beam's spectral and spatial properties.

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    Main Results:

    • Achieved amplification of the input laser light to ~90 mW.
    • The amplified beam retained the narrow spectral characteristics (<300 kHz) of the input light.
    • The output beam exhibited a single diffraction-limited spatial mode, indicating coherence across the entire 100-microm array width.
    • Observed dramatic narrowing of the free-running laser array's output spectrum and spatial distribution when seeded with the input light.

    Conclusions:

    • Demonstrated a viable method for coherent amplification of diode laser light using a laser diode array.
    • The technique effectively transfers spectral and spatial coherence from a low-power source to a higher-power output.
    • The results support a simple quantitative model of the amplification process.