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采用坩埚下降法,制备了尺寸为Φ10mm×110mm的高质量Tm3+掺杂LiYF4(YLF:Tm3+)单晶体。测试了样品的电感耦合等离子(ICP)、X光衍射(XRD)吸收光谱以及790nm LD激发下的荧光光谱。应用Judd-Ofelt理论计算了Tm3+在YLF∶Tm3+单晶材料中的唯象强度参数Ωt、能级跃迁振子强度Pexp、自发辐射跃迁几率A、荧光分支比β和辐射寿命τrad等光谱参数,同时计算了1 800nm波段的吸收截面和受激发射截面分别为σabs=0.52×10-20 cm2和σem=0.67×10-20 cm2。在荧光光谱中观察到1 470nm与1 800nm的荧光发射,它们分别对应于Tm3+的3 H4→3 F4与3 F4→3 H6的能级跃迁。测定了1 800nm波段的荧光寿命,并计算得到3 F4→3 H6跃迁的量子效率为79.22%。
A high quality Tm3 + doped LiYF4 (YLF: Tm3 +) single crystal with a size of Φ10mm × 110mm was prepared by the crucible descent method. Samples were analyzed by inductively coupled plasma (ICP), X-ray diffraction (XRD) absorption spectra and fluorescence spectra at 790 nm LD excitation. Judd-Ofelt theory was used to calculate the spectral parameters of phenomenological intensity parameter Ωt, energy level transition oscillator strength Pexp, spontaneous emission transition probability A, fluorescence branching ratio β and radiation lifetime τrad of Tm3 + in YLF: Tm3 + The absorption cross-section and the stimulated emission cross section in the 1 800 nm band are respectively σabs = 0.52 × 10-20 cm2 and σem = 0.67 × 10-20 cm2. Fluorescence emission at 1 470 nm and 1 800 nm was observed in the fluorescence spectra, corresponding to the energy transitions of 3 H4 → 3 F4 and 3 F4 → 3 H6, respectively, of Tm3 +. The fluorescence lifetime at 1 800 nm was measured, and the quantum efficiency of 3 F4 → 3 H6 transition was calculated to be 79.22%.