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Diamond-saw-diced multi-color ridge Pr,Gd:LiYF4 waveguide lasers.

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    Optics Letters
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    Epitaxial growth of Pr, Gd:LiYF4 created low-loss waveguides. These waveguides enabled efficient red channel laser operation, demonstrating potential for advanced optical devices.

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    Area of Science:

    • Materials Science
    • Optoelectronics
    • Solid-State Physics

    Background:

    • Rare-earth doped LiYF4 crystals are promising for laser applications.
    • Developing low-loss waveguides is crucial for integrated photonics.

    Purpose of the Study:

    • To grow single-crystalline Pr, Gd:LiYF4 layers for optical applications.
    • To fabricate low-loss ridge waveguides from these layers.
    • To investigate the laser performance and emission properties of Pr3+ ions.

    Main Methods:

    • Liquid phase epitaxy for growing 0.3 at.% Pr, 3.5 at.% Gd:LiYF4 layers.
    • Precision diamond-saw dicing for microstructuring into ridge waveguides.
    • Continuous-wave (CW) laser operation measurements at 639.6 nm.

    Main Results:

    • Fabricated low-loss (0.16 dB/cm) ridge waveguides with sub-nm surface roughness.
    • Achieved 504 mW CW red channel laser output at 639.6 nm.
    • Demonstrated high slope efficiency (57.8%), low threshold (34 mW), linear polarization, and good beam quality (M²=1.66).

    Conclusions:

    • Epitaxial growth and microstructuring yield high-performance waveguide lasers.
    • Pr, Gd:LiYF4 waveguides show potential for efficient red light generation.
    • Polarized emission properties of Pr3+ in epitaxial layers were characterized.