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% Er: LuYO₃ crystal was grown by optical floating zone method for the first time. The absorption section at 980 nm is $0.35\times {10}^{-20}$cm² with FWHM of 19 nm. The intensity parameters ${\Omega }_{\text{i}\left(\text{i}=\mathrm{2,4,6}\right)}$ and the radiative transition probability, fluorescence branching ratio and lifetime of energy level transition from ⁴I_11/2 to ⁴I_13/2 and ⁴I_13/2 to ⁴I_15/2 of Er ion in Er: LuYO₃ crystal were calculated. The emission cross-sections centered at 2721 nm and 1556 nm are 1.46 $\times$ 10⁻²⁰ cm² and 2.61 $\times$ 10⁻²¹ cm², which correspond to the transitions of Er³⁺: ⁴I_11/2$\to$⁴I_13/2 and Er³⁺: ⁴I_13/2$\to$⁴I_15/2, respectively. The fluorescence lifetime of ⁴I_11/2and ⁴I_13/2 under the excitation of 980 nm pulsed LD were 2.29 ms and 7.84 ms, respectively. The up-conversion fluorescence spectra and fluorescence decay curves were measured. The potential utility of the Er: LuYO₃ crystal as a tunable and ultra-short laser medium at 3.0 μm and 1.5 μm can be expected.

中文翻译：

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Er的生长和光谱：LuYO ₃单晶

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% Er：LuYO ₃晶体首次采用光浮区法生长。980 nm 处的吸收截面为$0.35\times {10}^{-20}$cm ²，FWHM 为 19 nm。强度参数${\Omega }_{\text{一世}\left(\text{一世}=\mathrm{2,4,6}\right)}$计算了Er:LuYO ₃晶体中Er 离子从⁴ I _11/2到⁴ I _13/2和⁴ I _13/2到⁴ I _15/2能级跃迁的辐射跃迁概率、荧光分支比和寿命. 以 2721 nm 和 1556 nm 为中心的发射截面为 1.46$\times$10 ^-20  cm ²和 2.61$\times$10 ^-21  cm ²，对应于 Er ³⁺ : ⁴ I _11/2的跃迁$\to$⁴ I _13/2和 Er ³⁺ : ⁴ I _13/2$\to$⁴ I _15/2，分别。⁴ I _11/2和⁴ I _13/2在980 nm脉冲LD激发下的荧光寿命分别为2.29 ms和7.84 ms。测量了上转换荧光光谱和荧光衰减曲线。可以预期Er: LuYO ₃晶体作为 3.0 μm 和 1.5 μm 可调谐超短激光介质的潜在用途。