采用坩埚下降法在非真空密闭条件下生长出尺寸为9mm×68mm的1mol% Er3+: LiYF4单晶材料, 测试了样品的折射率、透过光谱、吸收光谱、以及在980nm和792nm激光泵浦下的近红外和中红外荧光光谱. 应用Judd-Ofelt理论计算了Er3+离子在LiYF4晶体材料中的强度参数(?t, t=2,4,6)、能级跃迁振子强度(fcal)、自发辐射跃迁几率(A)、荧光分支比(B)、辐射寿命(trad)等光谱参数, 讨论了其近红外和中红外的荧光特性. 结果表明, 在980nm和792nm激光泵浦下观察到了1.5um近红外荧光和3.0um中红外荧光, 分别对应于Er3+: 4I13/2→4I15/2和4I11/2→4I13/2跃迁, 并分析了3.0um中红外荧光强度较弱的可能原因.
Er3+: LiYF4 single crystal was grown by the Bridgman method under non-vacuum atmosphere. The single crystal was in size of 9mm×68mm with 1mol% concentration of Er3+ ions. Optical properties of the single crystal including the refractive index, UV and IR transmission spectra, absorption spectrum, near-infrared emission spectrum under 980nm excitation and mid-infrared emission spectrum under 792nm excitation were measured. The intensity parameters (?t, t=2,4,6), oscillator strength(fcal), transition probabilities (A), branching ratios (B) and radiation lifetimes (trad) of Er3+ ions in the LiYF4 were estimated by using the Judd-Ofelt theory. The near- and mid-infrared fluorescence properties of the sample were discussed. The results indicate that near infrared fluorescence at 1.5μm corresponding to the Er3+: 4I13/2→4I15/2 transition is observed under 980nm excitation while mid-infrared fluorescence at 3.0μm corresponding to the Er3+: 4I11/2→4I13/2 transition is detected under 792 nm excitation. The reason that caused the weakening of fluorescence at 3.0μm is analyzed.
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