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    Researchers developed low-loss thulium-doped (Tm:LiYF4) waveguide lasers using liquid phase epitaxy and diamond saw dicing. This method achieved 1.30 W output power, showing promise for efficient channel waveguide lasers.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Laser Physics

    Background:

    • Epitaxial growth of rare-earth-doped fluoride films is crucial for integrated optics.
    • Thulium-doped materials are promising for infrared laser applications.
    • Low-loss waveguides are essential for efficient laser performance.

    Purpose of the Study:

    • To fabricate low-loss surface channel waveguides using Tm3+, Gd3+:LiYF4 films.
    • To investigate the laser performance of these waveguides.
    • To evaluate the potential of LPE and diamond saw dicing for waveguide laser fabrication.

    Main Methods:

    • Growth of Tm3+, Gd3+:LiYF4 films on LiYF4 substrates via liquid phase epitaxy (LPE).
    • Fabrication of 30 × 30 μm2 surface channel waveguides using diamond saw dicing.
    • Characterization of waveguide morphology and propagation losses.
    • End-pumped continuous-wave (CW) laser operation using a Ti:Sapphire laser at 783 nm.

    Main Results:

    • Achieved 1.30 W output power at 1880 nm with π-polarization.
    • Obtained a high slope efficiency of 80% with respect to absorbed pump power.
    • Laser threshold was as low as 80 mW.
    • Measured propagation losses of <0.3 dB/cm, indicating low waveguide roughness.

    Conclusions:

    • The combination of LPE and diamond saw dicing is a viable technique for producing high-performance waveguide lasers.
    • This technology is suitable for developing multi-watt, single-mode channel waveguide lasers and amplifiers.
    • The fabricated Tm:LiYF4 waveguides demonstrate excellent optical properties for laser applications.