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Optical Spectra and Gain properties of ho^(3+)/pr^(3+)Co-doped LiYF_4 Crystal

Journal of Materials Science & Technology 2014年第9期30卷 910-916页

作者： Jiangtao Peng Haiping Xia Peiyuan Wang Haoyang Hu Lei Tang Yuepin Zhang Haochuan Jiang Baojiu Chen Key Laboratory of Photo-electronic Materials Ningbo University Ningbo Institute of Materials Technology & Engineering Chinese Academy of Sciences Department of Physics Dalian Maritime University

The LiYF4 single crystals singly doped ho3＋ and co-doped ho3＋, pr3+＋ ions were grown by a modified Bridgman method. The Judd-Ofelt strength parameters （Ω2, Ω4, Ω6） of No3＋ were calculated according to the absorption spectra and the Judd-Ofelt theory, by which the radiative transition probabilities （A）, fluorescence branching ratios （β） and radiative lifetime （τ rad） were obtained. The radiative lifetimes of 5/6 and 5/7 levels in ho3＋（1 mol%）：LiYF4 are 10.89 and 20.19 ms, respectively, while 9.77 and 18.50 ms in ho3＋/pr3+＋ doped crystals. Hence, the τ rad of 5/7 level decreases significantly by introduction of pr3+＋ into ho3＋：LiYF4 crystal which is beneficial to the emission of 2.9 μm. The maximum emission cross section of ho3＋：LiYF4 crystal located at 2.05 μm calculated by McCumber theory is 0.51 ×10-20 cm2 which is compared with other crystals. The maximum emission cross section at 2948 nm in ho3＋/pr3+＋ co-doped LiYF4 crystal obtained by Fuchtbauer- Ladenburg theory is 0.68 × 10-20 cm2, and is larger than the value of 0.53 × 10-20 cm2 in ho3＋ singly doped LiYF4 crystal. Based on the absorption and emission cross section spectra, the gain cross section spectra were calculated. In the ho3- ions singly doped LiYF4 crystal, the gain cross sections for 2.05 μm infrared emission becomes positive once the population inversion level reaches 30%. It means that the pump threshold for obtaining 2.05 μm laser is probably lower which is an advantage for ho3＋-doped LiYF4 2.05 μm infrared lasers. The calculated gain cross section for 2.9 μm mid-infrared emission does not become positive until the population inversion level reaches 40% in ho3＋/pr3+＋：LiYF4 crystal, but 50% in ho3＋ singly doped LiYF4 crystal, indicating that a low pumping threshold is achieved for the H03＋：5/6 → 5/7 laser operation with the introduction of pr3+＋ ions. It was also demonstrated that pr3+＋ ion can deplete rapidly the lower laser ho3＋：5/7 level and has influence on the ho3＋：5/6 level. The ho3＋/pr3+＋：LiYF4 crystal may be a potential media for 2.9 μm mid-infr

关键词： LiYF4 crystal 2.9 μm ho3/pr3＋ Optical spectra Gain cross section

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