由1018 nm光纤激光器组成的同带抽运结构激光器是实现单根掺镱光纤达到输出极限的方法之一。由于Yb3+在发射光谱短波长处有相对较大的吸收截面，掺镱激光器一般很难工作于波长1030 nm以下。为获得高效率1018 nm光纤激光器，最根本的方法是调整掺镱光纤的光谱性质，使光纤发射次峰尽量靠近1018 nm。对Yb3+在石英光纤中光谱性质的改变机理进行了研究，通过共掺杂的方法获得了高性能1018 nm掺镱光纤，其预制棒发射次峰位于1008 nm，光纤发射次峰位于1021 nm。相较普通掺镱光纤,光纤发射次峰蓝移了18 nm，1018 nm处截面差值大。1018 nm激光的光光转换效率达到68%。

The upper limit of output power for single-mode laser from a single ytterbium-doped fiber can be reached using a tandem pumping configuration. Ytterbium-doped fiber laser is difficult to operate below 1030 nm due to the relatively large absorption cross sections. In order to get highly efficient ytterbium-doped fiber laser, the most basic method is to regulate the fluorescence properties of fiber and make the emission subpeak approach 1018 nm. The mechanism of how Yb3+ ions fluorescence properties change in silica fiber is studied and a 1018 nm ytterbium-doped fiber is obtained by co-doped method. The emission subpeaks of the preform and fiber are at 1008 nm and 1021 nm, respectively. The emission subpeak of the fiber is 18 nm, which is shorter than that of normal Yb-doped fiber, and the difference of emission cross sections is larger. Its optical-optical convertion efficiency at 1018 nm is up to 68%.