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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Optically pumped DBR-free semiconductor disk lasers.

Zhou Yang, Alexander R Albrecht, Jeffrey G Cederberg

    Optics Express
    |February 3, 2016
    PubMed
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    We developed high-power semiconductor disk lasers without distributed Bragg reflectors (DBRs). By bonding active regions to diamond heatspreaders, we achieved 2.5 W output power and a record 78 nm tuning range.

    Area of Science:

    • Semiconductor lasers
    • Optoelectronics
    • Materials science

    Background:

    • Distributed Bragg reflectors (DBRs) in semiconductor disk lasers present thermal impedance and bandwidth limitations.
    • Advanced heat management is crucial for high-power laser operation.

    Purpose of the Study:

    • To demonstrate DBR-free semiconductor disk lasers with enhanced power and tuning range.
    • To investigate novel heat management strategies for laser power scaling.

    Main Methods:

    • Active regions were lifted off and bonded to transparent heatspreaders, including single-crystalline chemical-vapor deposited diamond.
    • Laser operation was demonstrated using a total internal reflection geometry.
    • Thermal management analysis was performed for power scaling.

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    Main Results:

    • Achieved maximum continuous-wave (CW) output power of 2.5 W.
    • Demonstrated a record 78 nm tuning range centered at approximately 1160 nm.
    • Successfully operated lasers in a total internal reflection geometry.

    Conclusions:

    • DBR-free semiconductor disk lasers offer a viable path to high power and broad tunability.
    • Novel bonding and heatspreading techniques effectively mitigate thermal limitations.
    • The presented thermal management analysis provides a framework for future power scaling.