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    Researchers developed a solar-powered laser using a novel liquid coolant that enhances light absorption. This method increased laser output power by over 2.5 times compared to traditional cooling methods.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Renewable Energy

    Background:

    • Solid-state lasers are crucial for various applications.
    • Solar pumping offers a sustainable energy source for lasers.
    • Efficient light absorption in the laser medium is key for performance.

    Purpose of the Study:

    • To investigate a novel liquid coolant for solar-pumped solid-state lasers.
    • To enhance solar energy absorption within the laser rod.
    • To improve the overall output power and efficiency of solar lasers.

    Main Methods:

    • Utilized a neodymium-doped yttrium aluminum garnet (Nd:YAG) laser rod.
    • Employed a water-white-emulsion-paint mix as a combined coolant and light-scattering liquid.
    • Performed numerical modeling using a ray-tracing approach to predict absorption enhancement.
    • Experimentally validated the enhanced absorption and output power.

    Main Results:

    • The diffuse scattering liquid enhanced solar absorption in the laser rod by a factor of 2.6.
    • Experimental results showed a 2.58 times increase in average output power compared to pure water cooling.
    • Achieved a laser output power of 2.3 W with a collection efficiency of 27.5 W/m².

    Conclusions:

    • A water-white-emulsion-paint liquid is an effective coolant and light scatterer for solar-pumped lasers.
    • This approach significantly boosts solar absorption and laser output power.
    • The developed system demonstrates a viable path towards more efficient solar laser technology.