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High-efficiency ~2 μm laser in a single-mode Tm-doped lead germanate composite fiber

Peiwen Kuan Peiwen Kuan, Xiaokang Fan Xiaokang Fan, Wentao Li Wentao Li, Xueqiang Liu Xueqiang Liu, Chunlei Yu Chunlei Yu, Lei Zhang Lei Zhang, and Lili Hu and Lili Hu
2016 Chinese Optics Letters (COL)  
A highly Tm-doped lead germanate glass fiber is developed using the rod-in-tube method. The ∼2 μm laser beam quality of the fiber is ∼1.5. The lead germanate composite fiber jumpers are homemade for all the fiber laser investigations. When core is pumped by a 1590 nm Yb/Er fiber laser, a maximum laser output of 313 mW is achieved at a 670 mW pump power, and the corresponding slope efficiency is ∼52.8%. Moreover, by using a 2 cmlong lead germanate fiber as the gain medium, a 33 mW 1942 nm Tm
more » ... 3 mW 1942 nm Tm laser is also demonstrated.
doi:10.3788/col201614.081601 fatcat:xgsj3kpguzf2hfwz3lg6nvjggi