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由1018nm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1030nm以下。为获得高效率1018nm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1018nm。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1018nm掺镱光纤,其预制棒发射次峰位于1008nm,光纤发射次峰位于1021nm。相较普通掺镱光纤,光纤发射次峰蓝移了18nm,1018nm处截面差值大。1018nm激光的光-光转换效率达到68%。
One of the methods to achieve the output limit of a single ytterbium-doped fiber is to use a laser with pumped structure consisting of 1018nm fiber lasers. Since Yb3 + has a relatively large absorption cross-section at the short wavelength of the emission spectrum, Ytterbium-doped lasers are generally very hard to operate at wavelengths below 1030 nm. In order to obtain a high efficiency 1018nm fiber laser, the most fundamental method is to adjust the spectral properties of the Ytterbium-doped fiber so that the second peak of the fiber emission is as close as possible to 1018nm. The mechanism of the change of the spectral properties of Yb3 + in quartz fiber was studied. The high-performance 1018nm Ytterbium-doped fiber was obtained by co-doping method. The secondary peak of prebaked rod was located at 1008nm and the secondary peak of fiber was located at 1021nm. Compared with the ordinary Ytterbium-doped fiber, the peak emission of blue light of the fiber is shifted by 18 nm, and the difference of cross-section at 1018 nm is large. The light-to-light conversion efficiency of 1018nm laser reaches 68%.