College of Materials Science and Engineering, China Jiliang University, Hangzhou 310018, P.R. China.
Collage of Materials Science and Engineering, Changchun University of Science and Technology, Changchun, 130022, P.R. China.
Sci Rep. 2016 Nov 30;6:37873. doi: 10.1038/srep37873.
2.0 μm emission properties of Er/Ho codoped silicate glasses were investigated pumped by 980 nm LD. Absorption spectra were determined. Intense mid-infrared emissions near 2 μm are observed. The spectral components of the 2 μm fluorescence band were analyzed and an equivalent model of four-level system was proposed to describe broadband 2 μm emission. Low OH absorption coefficient (0.23 cm), high fluorescence lifetime (2.95 ms) and large emission cross section (5.61 × 10 cm) corresponding to Ho: I→I transition were obtained from the prepared glass. Additionally, energy transfer efficiency from the Er: I to the Ho: I level can reach as high as 85.9% at 0.75 mol% HoO doping concentration. Energy transfer microscopic parameters (C) via the host-assisted spectral overlap function were also calculated to elucidate the observed 2 μm emissions in detail. Moreover, the rate equation model between Er and Ho ions was developed to elucidate 2 μm fluorescence behaviors with the change of Ho concentration. All results reveal that Er/Ho codoped silicate glass is a promising material for improving the Ho 2.0 μm fiber laser performance.
研究了掺铒/铥硅酸盐玻璃在 980nm LD 泵浦下的 2.0μm 发射特性。测定了吸收光谱。观察到近 2μm 的强中红外发射。分析了 2μm 荧光带的光谱成分，并提出了一个四能级系统的等效模型来描述宽带 2μm 发射。从制备的玻璃中获得了对应于 Ho：I→I 跃迁的低 OH 吸收系数（0.23cm）、高荧光寿命（2.95ms）和大发射截面（5.61×10cm）。此外，在 0.75mol% HoO 掺杂浓度下，从 Er：I 到 Ho：I 能级的能量转移效率可高达 85.9%。还通过主晶格辅助光谱重叠函数计算了能量传递微观参数（C），以详细阐明观察到的 2μm 发射。此外，还建立了 Er 和 Ho 离子之间的速率方程模型，以阐明随着 Ho 浓度变化的 2μm 荧光行为。所有结果表明，掺铒/铥硅酸盐玻璃是提高 Ho 2μm 光纤激光器性能的一种有前途的材料。
