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Monoclinic zinc monotungstate Yb.sup.3+./sup.,Li.sup.+./sup.:ZnWO.sub.4./sub.: Part II. Polarized spectroscopy and laser operation

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    0541841 - FZÚ 2022 RIV NL eng J - Journal Article
    Volokitina, A. - Paul David, Samuel - Loiko, P. - Subbotin, K. - Titov, A. - Lis, D. - Solé, R.M. - Jambunathan, Venkatesan - Lucianetti, Antonio - Mocek, Tomáš - Camy, P. - Chen, W. - Griebner, U. - Petrov, V. - Aguilo, M. - Diaz, F. - Mateos, X.
    Monoclinic zinc monotungstate Yb3+,Li+:ZnWO4: Part II. Polarized spectroscopy and laser operation.
    Journal of Luminescence. Roč. 231, Mar (2021), č. článku 117811. ISSN 0022-2313. E-ISSN 1872-7883
    R&D Projects: GA MŠMT EF15_006/0000674; GA MŠMT LO1602
    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 : zinc tungstate * ytterbium lasers * optical spectroscopy * stark splitting * luminescence * laser operation
    OECD category: Optics (including laser optics and quantum optics)
    Impact factor: 4.171, year: 2021
    Method of publishing: Limited access

    Monoclinic ytterbium-lithium codoped zinc monotungstate crystal (Yb3+,Li+:ZnWO4) is a promising material for laser opertation at ~1.06 μm. Absorption, σabs, and stimulated-emission, σSE, cross-sections are determined for light polarized along the optical indicatrix axes, E || Np, Nm and Ng. At room temperature, the maximum σSE amounts to 2.81 × 10− 20 cm2 at 1055.6 nm (for E || Np) and the gain bandwidth reaches ~22 nm (for E || Ng). The radiative lifetime of the upper laser level is 0.37 ms. The Stark splitting of Yb3+ multiplets is resolved with low-temperature (6 K) spectroscopy revealing a relatively large total splitting of the ground-state, ΔE( 2 F7/2) = 804 cm − 1 , being remarkably high as compared to other Yb3+-doped tungstate crystals. A notable inhomogeneous broadening of the zero-phonon line is detected at 6 K. A continuous-wave diode-pumped 1.8 at.% Yb3+,Li+:

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