Monoclinic zinc monotungstate Yb3+,Li+:ZnWO4: Part II. Polarized spectroscopy and laser operationстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 8 апреля 2021 г.
Аннотация:Monoclinic ytterbium-lithium codoped zinc monotungstate crystal (Yb3+,Li+:ZnWO4) is a promising material forlaser opertation at ~1.06 μm. Absorption, σabs, and stimulated-emission, σSE, cross-sections are determined forlight polarized along the optical indicatrix axes, E || Np, Nm and Ng. At room temperature, the maximum σSEamounts 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 withlow-temperature (6 K) spectroscopy revealing a relatively large total splitting of the ground-state, ΔE(2F7/2) =804 cm 1, being remarkably high as compared to other Yb3+-doped tungstate crystals. A notable inhomogeneousbroadening of the zero-phonon line is detected at 6 K. A continuous-wave diode-pumped 1.8 at.% Yb3+,Li+:ZnWO4 laser generated a maximum output power of 2.90 W at ~1059 nm with a slope efficiency of 57.9% and alinearly polarized output (E || Np). Yb3+,Li+:ZnWO4 is attractive for broadly tunable and mode-locked oscillators.