Wang Yao, Yang Jianlong, Huang Chongyuan, Luo Yongfeng, Wang Shiwei, Tang Yulong, Xu Jianqiu
Opt Express. 2015 Feb 9;23(3):2991-8. doi: 10.1364/OE.23.002991.
We propose a cascaded tandem pumping technique and show its high power and high efficient operation in the 2-μm wavelength region, opening up a new way to scale the output power of the 2-μm fiber laser to new levels (e.g. 10 kW). Using a 1942 nm Tm(3+) fiber laser as the pump source with the co- (counter-) propagating configuration, the 2020 nm Tm(3+) fiber laser generates 34.68 W (35.15W) of output power with 84.4% (86.3%) optical-to-optical efficiency and 91.7% (92.4%) slope efficiency, with respect to launched pump power. It provides the highest slope efficiency reported for 2-μm Tm(3+)-doped fiber lasers, and the highest output power for all-fiber tandem-pumped 2-μm fiber oscillators. This system fulfills the complete structure of the proposed cascaded tandem pumping technique in the 2-μm wavelength region (~1900 nm → ~1940 nm → ~2020 nm). Numerical analysis is also carried out to show the power scaling capability and efficiency of the cascaded tandem pumping technique.
我们提出了一种级联串联泵浦技术，并展示了其在2μm波长区域的高功率和高效运行，为将2μm光纤激光器的输出功率提升至新水平（例如10kW）开辟了一条新途径。使用1942nm的Tm(3+)光纤激光器作为泵浦源，采用同向（反向）传播配置，2020nm的Tm(3+)光纤激光器相对于注入的泵浦功率，产生了34.68W（35.15W）的输出功率，光光效率为84.4%（86.3%），斜率效率为91.7%（92.4%）。它提供了2μm掺Tm(3+)光纤激光器所报道的最高斜率效率，以及全光纤串联泵浦2μm光纤振荡器的最高输出功率。该系统实现了在2μm波长区域（1900nm→1940nm→~2020nm）所提出的级联串联泵浦技术的完整结构。还进行了数值分析，以展示级联串联泵浦技术的功率扩展能力和效率。
