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Polarization selection rules for the allowed optical transitions in europium-terbium double activated calcium tungstate phosphor

机译:ter- double双活化钨酸钙磷光体允许的光学跃迁的偏振选择规则

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The paper is devoted to the problem of the optical anisotropy of the rare-earth ions occupying low-symmetry positions in crystals. The crystal field multiplets arising from LSJ terms of Eu3+ and Tb3+ ions in the crystal field of calcium rungstate scheelite (CaWO4) are analyzed (S-4 Point symmetry). The selection rules, in particular, polarization rules for the allowed electric dipole optical transitions in the electronic shells of the Eu3+ and Tb3+ in CaWO4 host lattice are discussed. Special attention is paid to the study of the angular (polarization) dependence of the two-photon absorption that seems to be. an effective tool for the understanding of the complicated optical pattern, The peculiarities of the anisotropy of the two-photon absorption prove to be specific for each allowed dipole transition in S4 symmetry center. (C) 2004 Elsevier Ltd. All rights reserved.
机译:该论文致力于解决稀土离子在晶体中占据低对称位置的光学各向异性问题。分析了钙梯格白钨矿(CaWO4)晶体场中由Eu3 +和Tb3 +离子的LSJ项引起的晶体场多重峰(S-4点对称性)。讨论了选择规则,尤其是CaWO4主晶格中Eu3 +和Tb3 +电子壳中允许的电偶极子光跃迁的极化规则。特别注意研究似乎是双光子吸收的角度(偏振)依赖性。作为了解复杂光学图案的有效工具,双光子吸收的各向异性的特殊性对于S4对称中心中的每个允许的偶极跃迁都是特定的。 (C)2004 Elsevier Ltd.保留所有权利。

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