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    This study introduces a novel method for pumping an Erbium-Chromium-Yttrium Aluminum Garnet (Er:Cr:YSGG) laser using LEDs and a Cerium-doped Yttrium Aluminum Garnet (Ce:YAG) luminescent concentrator, achieving laser emission and broadband incoherent light.

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    Area of Science:

    • Laser Physics and Photonics
    • Solid-State Lasers
    • Materials Science

    Background:

    • Traditional pumping methods for solid-state lasers can be inefficient and complex.
    • Luminescent concentrators offer a pathway to efficiently couple light into laser crystals.
    • Er:Cr:YSGG lasers are known for their emission in the mid-infrared, useful for various applications.

    Purpose of the Study:

    • To demonstrate, for the first time, the use of LEDs coupled via a Ce:YAG luminescent concentrator to pump an Er:Cr:YSGG crystal.
    • To characterize both the laser emission at 2.79 µm and the spontaneous emission at 1.6 µm from the pumped Er:Cr:YSGG crystal.
    • To evaluate the performance of the Er:Cr:YSGG crystal as both a laser source and a broadband incoherent light source.

    Main Methods:

    • A Ce:YAG luminescent concentrator was used to collect and redirect visible light (550-650 nm) from LED pumping.
    • The concentrated light was delivered in 1.5 ms pulses at 10 Hz to an Er:Cr:YSGG crystal in a transverse pumping configuration.
    • A biconcave cavity was employed for the Er:Cr:YSGG laser, and its output characteristics were measured.

    Main Results:

    • Successful laser emission at 2.79 µm was achieved, producing up to 6.8 mJ per pulse.
    • Strong spontaneous emission around 1.6 µm was observed, demonstrating the crystal's capability as a broadband incoherent source.
    • The Er:Cr:YSGG exhibited a peak power of 351 mW and a brightness of 1.4 W/sr/cm² at 1.6 µm.

    Conclusions:

    • The novel LED-pumped system using a Ce:YAG luminescent concentrator is effective for exciting Er:Cr:YSGG.
    • This approach enables dual functionality, producing both a 2.79 µm laser and a bright 1.6 µm incoherent source.
    • The demonstrated system offers a promising alternative for compact and efficient laser and broadband light generation.