Optical and gain properties of series of crystals LiF–YF₃–LuF₃ doped with Ce³⁺ and Yb³⁺ ions

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• 作者：A.S. Nizamutdinov ; V.V. Semashko ; A.K. Naumov ; S.L. Korableva ; R.Yu. Abdulsabirov ; A.N. Polivin ; M.A. Marisov
• 刊名：Journal of Luminescence
• 出版年：2007
• 出版时间：November 2007
• 年：2007
• 卷：127
• 期：1
• 页码：71-75
• 全文大小：193 K

文摘

Here, we present first results of systematic studies of host cation variation impact on spectral-kinetic, photochemical and gain properties of Ce³⁺-doped LiYF₄ (YLF), LiLuF₄ (LLF) and LiY_1−xLu_xF₄ family crystals. 5d–4f luminescence decay of Ce³⁺ ions studies, together with pump–probe experiments, indicate that previously reported twice higher luminescence quantum yield in LLF compared with that of YLF crystals is provided by more efficient upper lasing level feeding due to recombination and higher color center destruction rate in LLF against YLF crystals. Namely, it is responsible for higher energetic characteristics of laser based on Ce³⁺:LLF crystals. Strong and wide pump-induced absorption band centered at 310 nm is observed in Ce³⁺:YLF. This band is shifted to blue and its intensity goes down with Lu content. We have evaluated free charges recombination rate, excited state absorption cross-section for Ce³⁺ ions and some other photodynamic processes related microparameters. Fitting results indicate that pump-induced color centers lifetime decreases with Lu-content in LiYF₄–LiLuF₄ mixture and it can be associated with more efficient color center bleaching by Ce³⁺ ions 5d–4f fluorescence.