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Growth, structure, spectroscopy, and laser operation of a “Mixed” Yb (Y,Lu).sub.3./sub.Al.sub.5./sub.O.sub.12./sub. garnet crystal

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    0579752 - FZÚ 2024 RIV CH eng J - Journal Article
    Slimi, S. - Loiko, P. - Pan, M. - Lehoux, P. - Jambunathan, Venkatesan - Smrž, Martin - Mocek, Tomáš - Wang, Y. - Chen, W. - Petrov, V. - Solé, R.M. - Aguiló, M. - Díaz, F. - Camy, P. - Mateos, X.
    Growth, structure, spectroscopy, and laser operation of a “Mixed” Yb (Y,Lu)3Al5O12 garnet crystal.
    Crystals. Roč. 13, Nov (2023), č. článku 1588. ISSN 2073-4352. E-ISSN 2073-4352
    R&D Projects: GA MŠMT EF15_006/0000674
    EU Projects: European Commission(XE) 739573 - HiLASE CoE
    Grant - others:OP VVV - HiLASE-CoE(XE) CZ.02.1.01/0.0/0.0/15_006/0000674
    Institutional support: RVO:68378271
    Keywords : garnet crystals * ytterbium ion * crystal structure * optical spectroscopy * solid-state lasers
    OECD category: Optics (including laser optics and quantum optics)
    Impact factor: 2.7, year: 2022
    Method of publishing: Open access

    A single crystal of ytterbium-doped “mixed” yttrium–lutetium aluminum garnet with a stoichiometric composition of (Y0.601Lu0.233Yb0.166)3Al5O12 was grown by the Czochralski method and its structure, vibronic, spectroscopic, and laser properties were studied. The stimulated-emission cross-section for Yb3+ ions was maximized to 2.53 × 10−20 cm2 at 1031 nm. The emission bandwidth was ~8 nm, and the reabsorption-free luminescence lifetime of the 2F5/2 state was 1.063 ms. Pumped at 941 nm, the Yb laser generated a maximum output power of 1.04 W at 1.03 and 1.05 µm with a high slope efficiency of 76.4% and a laser threshold of 76 mW. A continuous wavelength tuning over a range of 51.6 nm (1026.4–1078.0 nm) was also achieved. Power scaling was achieved using a 969 nm diode-pumped microchip cavity. A maximum output power of ~9 W was obtained at 1.05 µm with a slope efficiency of 76% and an almost circular laser beam profile.
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