Yunnan Police College;
Kunming 650223;
China;
Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques;
South China University of Technology;
Guangzhou 510640;
China;
School of Physics and Optoelectronic Engineering;
Guangdong University of Technology;
Guangzhou 510006;
China;
Southwest Institute of Technical Physics;
Chengdu 610041;
China;
all-glass fiber; single-frequency; 2μm fiber laser; Tm:YAG ceramic derived;