Spectroscopic properties of Ho³⁺ ions in biaxial Lu₂SiO₅ crystal

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• 作者：Qin Dong ; Guangjun Zhao ; Jianyu Chen ; Yuchong Ding ; Baoquan Yao ; Zhengping Yu
• 关键词：A1. Spectral properties ; A2. Czochraski method ; B2. Laser materials
• 刊名：Optical Materials
• 出版年：2010
• 出版时间：July 2010
• 年：2010
• 卷：32
• 期：9
• 页码：873-877
• 全文大小：488 K

文摘

A high optical quality Ho³⁺-doped lutetium orthosilicate laser crystal Lu₂SiO₅ has been grown by the Czochraski method and the accurate concentration of Ho³⁺ ions in the crystal was measured. The polarized absorption spectra, polarized fluorescence spectra and fluorescence decay curve of Ho³⁺ ions in the Lu₂SiO₅ crystal were measured at room temperature. Based on the Judd–Ofelt model, three effective intensity parameters were determined as: Ω_2,eff = 4.57 × 10⁻²⁰ cm², Ω_4,eff = 3.11 × 10⁻²⁰ cm², Ω_6,eff = 1.42 × 10⁻²⁰ cm². The fluorescence lifetime of the ⁵I₇ manifold for Ho³⁺ ions was measured to be 3.3 ms and the quantum efficiency was estimated. The polarized emission cross-sections for the ⁵I₇ → ⁵I₈ transition were determined by Fuchtbauer–Ladenburg formula. The good spectroscopic properties imply that Ho: Lu₂SiO₅ crystal is a potential laser gain medium for 2 μm lasers.