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Frequency-narrowed external-cavity diode-laser-array bar.

B Chann, I Nelson, T G Walker

    Optics Letters
    |December 11, 2007
    PubMed
    Summary
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    External cavities effectively narrow the frequency of high-power diode-array bars. This technique achieved a 50 GHz linewidth from a 20-W array, maintaining 14 W of continuous wave output power.

    Area of Science:

    • Optics
    • Laser Technology
    • Materials Science

    Background:

    • High-power diode-array bars are crucial in various laser applications.
    • Achieving narrow linewidths in diode-array lasers is challenging due to inherent spectral broadening.
    • Existing methods for spectral narrowing often compromise output power or beam quality.

    Purpose of the Study:

    • To demonstrate the efficacy of external cavities for frequency narrowing high-power diode-array bars.
    • To investigate methods for minimizing spectral broadening in diode-array lasers.
    • To achieve significant linewidth reduction while maintaining high continuous wave output power.

    Main Methods:

    • Utilized a commercial 20-W diode-array bar.
    • Designed and implemented an external cavity feedback system.

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  • Employed a magnifying telescope and cylindrical collimating lens to correct for optical aberrations.

    • Main Results:

    • Successfully narrowed the linewidth of the diode-array bar to 50 GHz.
    • Maintained a continuous wave (cw) output power of 14 W.
    • Minimized spectral broadening effects caused by diode-array element curvature.

    Conclusions:

    • External cavity design is a viable method for frequency narrowing high-power diode-array bars.
    • The implemented optical system effectively reduces linewidth without substantial power loss.
    • This approach offers a pathway to improved spectral control in high-power diode laser systems.