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Single crystals of lithium neodymium ultraphosphate (probably LiNdP4O12) were grown by the Kyropoulos method from a melt. The crystal belongs to the orthorhombic system with space group Imma (D2h28), and the Nd content is 4.37×1021 cm−3. Fluorescence and optical absorption were examined. The lifetime of 4F3/2 levels was measured to be 120±10 μs. The effective emission cross section at the line peak (1.047 μ) was found to be (9.0±0.4)×10−19 cm2, which is very close to that of Nd:YAG.
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Yamada et al. (1974) studied this question.
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