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Effect of Tm

Angzhen Li, Jiquan Zhang, Meng Zhang

    Optics Letters
    |September 14, 2018
    PubMed
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    Researchers developed a new thulium-doped (Tm3+) silica microsphere laser emitting at 2.0 μm. This compact infrared laser source offers a low threshold and tunable output for various applications.

    Area of Science:

    • Photonics
    • Materials Science
    • Laser Physics

    Background:

    • Development of compact infrared laser sources is crucial for applications in sensing and medicine.
    • Thulium-doped (Tm3+) materials are known for their emission in the 2-micron wavelength range.

    Purpose of the Study:

    • To fabricate and characterize Tm3+-doped solgel silica microsphere lasers.
    • To investigate the effect of Tm3+ concentration on laser performance.
    • To demonstrate a low-threshold infrared laser source.

    Main Methods:

    • Fabrication of Tm3+-doped silica microspheres using a solgel method.
    • Overlaying Tm3+ solgel solutions onto silica resonators and annealing with a CO2 laser.
    • Utilizing a fiber taper-microsphere coupling method for laser excitation and output.

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    Main Results:

    • Achieved microsphere lasing in the 1.8-2.0 μm range with an 808 nm pump source.
    • Demonstrated a low threshold pumping power of 1.2 mW.
    • Observed a shift to longer wavelengths with increased Tm3+ concentration due to absorption effects.

    Conclusions:

    • The solgel method provides an effective way to create Tm3+-doped silica microlasers with tunable doping concentrations.
    • These microlasers represent a new generation of compact, low-threshold infrared sources.
    • Potential applications include gas sensing, medical surgery, and miniaturized photonic components.