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Pulsed pumping of semiconductor disk lasers.

Nils Hempler, John-Mark Hopkins, Alan J Kemp

    Optics Express
    |June 18, 2009
    PubMed
    Summary

    High-power pulsed semiconductor lasers enable efficient operation of semiconductor disk lasers, achieving 1.7W peak power. This pulsed pumping method significantly boosts laser output compared to continuous methods.

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    Area of Science:

    • Optics and Photonics
    • Semiconductor Lasers
    • Materials Science

    Background:

    • Semiconductor disk lasers (SDLs) offer high power and efficiency.
    • Pulsed pumping can enhance laser performance but requires thermal management.
    • Previous studies focused on continuous-wave (CW) pumping for SDLs.

    Purpose of the Study:

    • To investigate the performance of a semiconductor disk laser pumped by inexpensive, uncooled 905nm high-power pulsed semiconductor lasers.
    • To analyze the thermal effects and spectral characteristics under pulsed pumping.
    • To demonstrate spectral narrowing using an intra-cavity birefringent filter.

    Main Methods:

    • Utilized uncooled 905nm high-power pulsed semiconductor pump lasers.
    • Characterized laser emission, including peak power and spectral width.

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  • Performed time-dependent spectral analysis.
  • Employed finite element modeling for thermal process analysis.
  • Integrated an intra-cavity birefringent filter for spectral narrowing.

    • Main Results:

    • Achieved 1.7W peak power from a 2.3µm semiconductor disk laser.
    • Observed a seven-fold increase in power compared to continuous pumping.
    • Identified significant device heating (100-200ns pulse duration).
    • Demonstrated spectral narrowing to below 0.8nm using the birefringent filter.

    Conclusions:

    • Pulsed pumping with inexpensive semiconductor lasers is an effective method for high-power semiconductor disk laser operation.
    • Thermal management is crucial for optimizing pulsed SDL performance.
    • Intra-cavity spectral control is feasible for pulsed SDLs.