Spectroscopic analysis of Er³⁺ transition in Mg/Er-codoped LiNbO₃ crystal

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• 作者：Aihua Li ; Liang Sun ; Zhiren Zheng ; Wenzhi Wu ; Weilong Liu ; Yanqiang Yang ; Tianquan Lü ; ; Wenhui Su
• 关键词：Judd– ; Ofelt analysis ; Mg/Er ; LiNbO₃ crystal ; Time-resolved spectrum ; Laser action
• 刊名：Journal of Luminescence
• 出版年：2008
• 期刊代码：54_00222313
• 类别：ch
• 出版时间：February 2008
• 卷：128
• 期：2
• 页码：239-244
• 文件大小：179 K

摘要

We present a Judd–Ofelt spectroscopic analysis on the Mg/Er-codoped congruent lithium niobate (LiNbO₃) crystals. The Judd–Ofelt model is applied to the room temperature unpolarized absorption intensities of Er³⁺ ions on eleven transition bands to determine their intensity parameters: Ω₂=2.36×10⁻²⁰ cm², Ω₄=0.76×10⁻²⁰ cm², Ω₆=0.30×10⁻²⁰ cm² in Er:LiNbO₃ crystal heavily codoped with MgO. The radiative lifetime of ²H_9/2 becomes longer when MgO is added into Er:LiNbO₃ crystal. The experimental lifetimes are obtained using microsecond time-resolved spectra at 400 nm femtosecond pulse excitation to predict radiative quantum efficiency. Combining higher radiative quantum efficiency with longer radiative lifetime, we conclude that Mg/Er-codoped LiNbO₃ crystals are more suitable than Er: LiNbO₃ ones in laser materials.