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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
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Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

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Aperture shared laser diode array beam combiner.

D L Begley, W L Casey, D W Martin

    Applied Optics
    |June 10, 2010
    PubMed
    Summary
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    Researchers developed a noncoherent laser beam combiner using semiconductor lasers and rod lenses. This device achieved 600 mW output power and 5.25% efficiency, with potential for dichroic combining of multiple arrays.

    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Laser Beam Combining

    Background:

    • High-power laser sources are crucial for various applications.
    • Efficient beam combining is essential for increasing laser output power.
    • Semiconductor lasers offer compact and efficient light generation.

    Purpose of the Study:

    • To fabricate a noncoherent laser beam combiner using discrete semiconductor lasers.
    • To achieve high output power and efficiency in a compact laser array.
    • To explore dichroic combining techniques for further power scaling.

    Main Methods:

    • Fabrication of a ten-diode semiconductor laser array.
    • Utilization of graded-index rod lenses as collimators for each laser.
    • Assembly into a noncoherent beam combiner configuration.

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  • Development of a dichroic combining technique for multiple arrays.

    • Main Results:

    • Achieved a continuous wave output power of 600 mW.
    • Reached a total efficiency of 5.25%.
    • Produced a combined beam with a 5-mrad divergence.

    Conclusions:

    • The developed noncoherent laser beam combiner is effective for high-power applications.
    • Graded-index rod lenses provide efficient collimation for semiconductor laser arrays.
    • Dichroic combining offers a viable path for further scaling of laser output power.