Abstract Tm:Lu3Al5O12 (Tm:LuAG) single crystal fiber (SCF) with a diameter of 0.6 mm and a length of 140 mm was grown from transparent ceramics by laser-heated pedestal growth (LHPG) method. The growth, Tm3+ ion distribution, absorption spectrum, Judd-Ofelt (J-O)parameter and emission spectrum of SCF are discussed in detail. The test results show that the diameter fluctuation of the SCF is less than 2% and the Tm3+ ion distribution is relatively uniform. J-O theory was applied to analyze the absorption spectrum. With the J-O intensity parameters Ωt(t=2,4,6), the emission probabilities, fluorescence branching ratios and radiative lifetimes for the Tm:LuAG SCF and transparent ceramic were all calculated. The stimulated emission cross-section of the3F4→3H6 transition was obtained by using the Fuchtbauer-Ladenburg (F-L) method. After comparison, it is found that the spectral performance of Tm:LuAG SCF has been improved to a certain extent on the basis of transparent ceramics. It has the potential to be applied to fiber lasers.

中文翻译：

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激光加热基座法制备透明陶瓷Tm:Lu3Al5O12单晶光纤及其光谱特性

摘要 Tm:Lu3Al5O12 (Tm:LuAG) 单晶光纤 (SCF) 直径为 0.6 mm，长度为 140 mm，采用激光加热基座生长 (LHPG) 方法从透明陶瓷中生长出来。详细讨论了SCF的生长、Tm3+离子分布、吸收光谱、Judd-Ofelt (JO)参数和发射光谱。测试结果表明，SCF的直径波动小于2%，Tm3+离子分布比较均匀。应用JO理论分析吸收光谱。使用 JO 强度参数 Ωt(t=2,4,6)，计算了 Tm:LuAG SCF 和透明陶瓷的发射概率、荧光分支比和辐射寿命。通过使用 Fuchtbauer-Ladenburg (FL) 方法获得 3F4→3H6 跃迁的受激发射截面。比较后，发现Tm:LuAG SCF的光谱性能在透明陶瓷的基础上得到了一定程度的提升。它有可能应用于光纤激光器。