Optical spectroscopy of NaLa(WO₄)₂:Dy³⁺ single crystal

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• 作者：Yanping Wei ; Chaoyang Tu ; Hongyan Wang ; Fugui Yang ; Guohua Jia ; Zhenyu You ; Xiuai Lu ; Jianfu Li ; Zhaojie Zhu ; Yan Wang
• 关键词：Solid-state laser materials ; Crystal growth ; Optical spectroscopy
• 刊名：Journal of Alloys and Compounds
• 出版年：2007
• 出版时间：12 July 2007
• 年：2007
• 卷：438
• 期：1-2
• 页码：310-316
• 全文大小：282 K

文摘

NaLa(WO₄)₂:Dy³⁺ crystals were grown successfully by the Czochraski technique. The Raman, infrared, electronic absorption and emission spectra were measured at room temperature. The Judd–Ofelt theory, extended to anisotropic system, has been applied to evaluate the intensity parameters Ω_t (t = 2, 4, 6), radiative transition rates A, radiative lifetimes τ_R, and fluorescent branching ratios β. Although there are several transitions originating in the ⁴F_9/2 level, a major part of emission intensity is contained in the ⁴F_9/2 → ⁶H_13/2 transition. The stimulated emission cross-sections for this transition were estimated by using the Füchtbauer–Ladenburg method. The luminescence decay curve was also measured at room temperature. The results indicate that NaLa(WO₄)₂:Dy³⁺ may be considered as laser active materials operating near 0.57 μm.