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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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Solar-pumped Er,Tm,Ho:YAG laser.

R M Benmair, J Kagan, Y Kalisky

    Optics Letters
    |September 18, 2009
    PubMed
    Summary
    This summary is machine-generated.

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    This study demonstrates the first directly solar-pumped laser operating at 77 Kelvin, using an Erbium, Thulium, Holmium-doped Yttrium Aluminum Garnet laser rod. The system achieved 12 W average power, showcasing potential for sustainable laser technology.

    Area of Science:

    • Lasers and Photonics
    • Sustainable Energy Technologies
    • Solid-State Lasers

    Background:

    • Direct solar pumping offers a sustainable alternative for laser excitation.
    • Achieving efficient quasi-continuous wave (quasi-cw) lasing requires careful thermal management.
    • Erbium, Thulium, Holmium-doped Yttrium Aluminum Garnet (Er,Tm,Ho:YAG) lasers are suitable for infrared applications.

    Purpose of the Study:

    • To demonstrate the feasibility of a directly solar-pumped laser system.
    • To achieve quasi-cw lasing of the Holmium (Ho) ion using solar radiation.
    • To investigate the performance and stability of such a system at cryogenic temperatures (77 K).

    Main Methods:

    • A 5-mm-diameter, 62-mm exposed-length Er,Tm,Ho:YAG rod was directly illuminated by solar radiation.

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  • Solar radiation was modulated using a 20% duty cycle chopper to manage thermal load.
  • The laser was operated at 77 K to achieve Holmium ion lasing.

    • Main Results:

    • The solar-pumped laser achieved an average output power of 12 W.
    • Peak power exceeded 65 W during the chopper's open intervals.
    • A slope efficiency of 3.8% and a threshold input energy of approximately 100 W were recorded.
    • Stable laser performance was maintained for extended durations (up to hours).

    Conclusions:

    • This work represents the first direct solar-pumped laser operating at 77 K.
    • The results validate the potential of solar energy for powering solid-state lasers.
    • The system demonstrates stable and efficient operation, paving the way for future solar-powered laser applications.