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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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High-intensity rectangular fiber-coupled diode laser array for solid-state laser pumping.

P J Morris, W Lüthy, H P Weber

    Applied Optics
    |September 22, 2010
    PubMed
    Summary
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    A new method efficiently couples high-power diode laser arrays into rectangular optical fibers. This technique improves beam quality and intensity for laser applications.

    Area of Science:

    • Optics and Photonics
    • Laser Technology

    Background:

    • High-power diode lasers are crucial for various applications.
    • Efficiently coupling diode laser output into optical fibers remains a challenge.
    • Existing methods often suffer from power loss and beam degradation.

    Purpose of the Study:

    • To propose and validate a novel coupling scheme for high-power diode laser bars using rectangular optical fibers.
    • To enhance power delivery and improve beam characteristics from diode laser sources.

    Main Methods:

    • A scale version of the coupling scheme was tested using an individual diode laser array and a single rectangular fiber.
    • Power coupling efficiency was measured for a 1-W continuous-wave diode laser array.
    • Far-field intensity patterns and divergence were analyzed before and after fiber coupling.

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    Direct Imaging of Laser-driven Ultrafast Molecular Rotation
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    Main Results:

    • 60% of the diode laser power was coupled into a 216 µm × 28 µm optical fiber.
    • Output intensities reached 9.9 kW cm⁻².
    • The elliptical, dual-lobed far-field pattern was converted to a nearly circular, single-lobed pattern with reduced divergence (21° × 22° FWHM).
    • Beam quality was reduced by a factor of 30.
    • Alignment tolerances exceeded 10 µm in all three planes.

    Conclusions:

    • The proposed rectangular optical fiber coupling scheme is effective for high-power diode laser bars.
    • This method significantly improves beam quality and output intensity.
    • The scheme offers practical advantages with large alignment tolerances, suitable for real-world applications.