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New spectroscopic and laser data on monoclinic Ba(Yb1−xErx)2F8 crystals are obtained. Efficient 2 μm stimulated emission of Er3+ ions in the 4F9/2 → 4I11/2 channel and 2 and 3 μm cascade lasing of the sequential 4F9/2 → 4I11/2 → 4I13/2 transitions were excited at room temperature under Xe flashlamp pumping. Intensity characteristics of manifold‐to‐manifold (JJ′ transitions) such as Einstein coefficients AJJ, line strengths sJJ′, branching ratios βJJ′, and radiative lifetimes τrad for the initial laser states 4I13/2, 4I11/2, 4I9/2, 4F9/2, 4S3/2, and 2H(2)9/2 were analyzed in detail. All observed laser transitions between individual Stark levels were identified. Unlike well‐known 2 μm lasers with Ho3+, Tm3+, Co2+, and Ni2+ ions in many oxide and fluoride compounds, BaYb2F8: Er3+ crystals operate on a pure four‐level generating scheme.
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Каминский et al. (1996) studied this question.
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