In this article, for the first time, an efficient multi-wavelength fiber laser based on a Tm:Er:Yb:Ho co-doped germanate glass, optically pumped at 980 nm wavelength and simultaneously emitting at 1550 nm, 1800 nm and 2050 nm wavelengths, is designed and optimized. An exhaustive model, taking into account the energy transfer phenomena between different rare earths, is developed. The device behavior is investigated by means of several parametric sweeps with respect to the input pump power, the fiber length, the dopant concentrations and the output mirrors reflectivities. Four optimal concentrations have been found by means of a home-made computer code based on particle swarm optimization (PSO) approach, allowing a global solution search. These concentrations allow levels of output powers very close to each other, equal to 20 mW $\pm$ 0.1$\%$ at 1550 nm, 1800 nm and 2050 nm, respectively. These results predict the possibility of tailoring the dopant concentrations in order to construct broadband optical sources with similar emission powers at multiple wavelengths and broadband amplifiers.

中文翻译：

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基于Tm:Er:Yb:Ho共掺杂锗酸盐玻璃的多波长光纤激光器设计

在本文中，首次提出了一种基于 Tm:Er:Yb:Ho 共掺杂锗酸盐玻璃的高效多波长光纤激光器，在 980 nm 波长处进行光泵浦并同时在 1550 nm、1800 nm 和 2050 nm 处发射波长，经过设计和优化。考虑到不同稀土之间的能量转移现象，开发了一个详尽的模型。通过与输入泵浦功率、光纤长度、掺杂剂浓度和输出反射镜反射率相关的几个参数扫描来研究器件行为。已经通过基于粒子群优化 (PSO) 方法的自制计算机代码找到了四个最佳浓度，允许全局解决方案搜索。这些集中允许输出功率水平彼此非常接近，等于 20 mW $\pm$ 0。1$\%$ 分别在 1550 nm、1800 nm 和 2050 nm。这些结果预测了调整掺杂剂浓度以构建在多个波长和宽带放大器上具有相似发射功率的宽带光源的可能性。