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20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier
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UV-pumped visible Tb3+-lasers.

S Kalusniak, H Tanaka, E Castellano-Hernández

    Optics Letters
    |November 13, 2020
    PubMed
    Summary
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    Continuous-wave laser operation was achieved in terbium-doped lithium lutetium fluoride (Tb3+:LiLuF4) crystals using UV pumping. This method offers higher absorption and efficiency for future high-power diode-pumped lasers.

    Area of Science:

    • Solid-state laser physics
    • Materials science
    • Quantum electronics

    Background:

    • Terbium-doped materials are promising for laser applications.
    • UV pumping offers advantages over visible light pumping for certain laser media.

    Purpose of the Study:

    • To investigate continuous-wave laser operation of Tb3+:LiLuF4 under UV pumping.
    • To evaluate the efficiency and performance characteristics of this laser system.
    • To explore the potential for high-power diode-pumped lasers.

    Main Methods:

    • Continuous-wave laser operation was demonstrated using a frequency-doubled Ti:sapphire laser at 359 nm.
    • The crystal used was terbium-doped lithium lutetium fluoride (Tb3+:LiLuF4).
    • Absorption cross sections and population dynamics were analyzed.

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    Main Results:

    • Efficient population of the upper laser level (5D4) was observed due to cross-relaxation.
    • Laser operation was achieved in the green and yellow spectral regions.
    • Slope efficiencies of 41% (green) and 20% (yellow) were recorded.
    • Optical-to-optical efficiencies were twice as high compared to cyan-blue pumping.

    Conclusions:

    • UV pumping of Tb3+:LiLuF4 is a viable method for efficient laser operation.
    • The material's properties are suitable for developing future high-power diode-pumped lasers.
    • Higher absorption cross sections in the UV enable shorter gain media, beneficial for high-power applications.