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Red Sm:KGd(WO4)2 laser at 649 nm.

Amandine Baillard, Pavel Loiko, Daniel Rytz

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    |September 14, 2023
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    Summary
    This summary is machine-generated.

    We achieved the first red laser operation using a samarium-doped potassium gadolinium tungstate crystal. This new laser source offers potential for various applications requiring red light emission.

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    Area of Science:

    • Laser physics
    • Solid-state spectroscopy
    • Materials science

    Background:

    • Samarium (Sm3+) doped crystals are investigated for laser applications.
    • Monoclinic KGd(WO4)2 (potassium gadolinium tungstate) is a promising host material.

    Purpose of the Study:

    • To demonstrate the first laser operation of Sm3+-doped KGd(WO4)2 in the red spectral range.
    • To characterize the laser performance and spectroscopic properties.

    Main Methods:

    • Laser oscillation was achieved by pumping a 0.8 at.% Sm:KGd(WO4)2 crystal with a frequency-doubled optically pumped semiconductor laser (2ω-OPSL) at 479.1 nm.
    • Spectroscopic properties of Sm3+ ions were measured.
    • Laser output power, threshold, slope efficiency, and polarization were analyzed.

    Main Results:

    • The Sm:KGd(WO4)2 laser operated at 649.1 nm (4G5/2 → 6H9/2 transition) with up to 17.6 mW output power.
    • A slope efficiency of 16.9% and a low laser threshold of 29 mW were achieved.
    • The laser exhibited self-pulsing behavior with microsecond pulses at a few kHz repetition rate and linear polarization.

    Conclusions:

    • Sm:KGd(WO4)2 is a viable material for red laser generation.
    • The laser's performance characteristics make it suitable for potential applications.
    • Further investigation into the polarized spectroscopic properties of Sm3+ ions in this host is valuable.