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    Optics Letters
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    Continuous wave, room-temperature laser oscillation was achieved using a novel Ytterbium (Yb3+)-doped fluoride crystalline waveguide. This breakthrough offers high slope efficiencies and output power for laser applications near 1 μm.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Laser Physics

    Background:

    • Development of efficient laser sources operating around 1 μm is crucial for various applications.
    • Ytterbium (Yb3+)-doped materials are promising for near-infrared laser development.
    • Crystalline waveguides offer advantages for compact and high-power laser designs.

    Purpose of the Study:

    • To report the first continuous wave, room-temperature laser oscillation from an Ytterbium (Yb3+)-doped fluoride crystalline waveguide.
    • To investigate the performance characteristics, including slope efficiency and output power, of this novel laser system.

    Main Methods:

    • Fabrication of an Ytterbium (Yb3+)-doped fluoride crystalline waveguide using the liquid phase epitaxy technique.
    • Characterization of laser oscillation under continuous wave (CW) pumping.
    • Measurement of output power and slope efficiency at different emission wavelengths.

    Main Results:

    • Successful demonstration of continuous wave, room-temperature laser oscillation around 1 μm.
    • Achieved maximum slope efficiencies of 76% at 994 nm and 41% at 1020 nm.
    • Obtained a maximum output power of 2.8 W at 1020 nm using a high-brightness fiber laser pump.

    Conclusions:

    • The Yb3+-doped fluoride crystalline waveguide is a viable platform for efficient CW laser operation.
    • The liquid phase epitaxy technique enables the fabrication of high-performance doped crystalline waveguides.
    • This work paves the way for compact, high-power laser sources in the 1 μm spectral region.