Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou City, Fujian Province 350002, PR China; College of Materials Science and Engineering, Fujian Normal University, Fuzhou City, Fujian Province 350007, PR China.
Key Laboratory of Optoelectronic Materials Chemistry and Physics, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou City, Fujian Province 350002, PR China.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Nov 5;204:508-513. doi: 10.1016/j.saa.2018.06.069. Epub 2018 Jun 19.
Er,Eu:YAlO (abbr. as Er,Eu:YAP) crystal was grown by the Czochralski technique for the first time. Its absorption and fluorescence spectra as well as the fluorescence decay curves were measured and investigated. The spectral parameters including absorption cross-section and emission cross-section were calculated. It is found that the crystal has short lifetimes at I and I levels, large absorption cross-section at 974 nm and 790 nm, and large stimulated emission cross-section at 2704 nm. The co-dopant Eu decreases the fluorescence lifetime of I level from 400 μs to 59.35 μs, and thus inhibits the self-termination effect of ~2.7 μm in some degree. We develop a theoretical model that simulates the laser characteristics of Er,Eu:YAP crystal numerically. Based on Er-Eu energy level diagrams, the rate equation model was built and discussed. It was found that: when the pump rate increases gradually, the laser quantum efficiency reaches to its upper limit with a fixed value 2-p, and this value is 1.35 for Er,Eu:YAP crystal. The results show that Er,Eu:YAP crystal is an excellent material candidate for ~2.7 μm laser.
铒、镱共掺钇铝石榴石（Er,Eu:YAP）晶体首次采用提拉法生长。测量并研究了其吸收和荧光光谱以及荧光衰减曲线。计算了光谱参数，包括吸收截面和发射截面。结果表明，该晶体在 I 能级和 I 能级上具有较短的寿命，在 974nm 和 790nm 处具有较大的吸收截面，在 2704nm 处具有较大的受激发射截面。共掺 Eu 使 I 能级的荧光寿命从 400µs 降低到 59.35µs，从而在一定程度上抑制了2.7µm 的自终止效应。我们开发了一个理论模型，对 Er,Eu:YAP 晶体的激光特性进行了数值模拟。基于 Er-Eu 能级图，建立并讨论了速率方程模型。结果表明：当泵浦速率逐渐增加时，激光量子效率达到其上限，固定值为 2-p，对于 Er,Eu:YAP 晶体，该值为 1.35。结果表明，Er,Eu:YAP 晶体是2.7µm 激光的优秀材料候选者。
