Jiachen Wang Korea Institute of Science and Technology (Korea, Republic of) Dong-il Yeom Ajou Univ. (Korea, Republic of) Sang Bae Lee,Kwanil Lee Korea Institute of Science and Technology (Korea, Republic of)
An all-fiber type, CW, linearly polarized thulium-doped fiber laser is reported. Highly linear polarization was achieved by a special management of fiber Bragg gratings, which performs as the laser cavity reflectors. The laser generated 28 W signal output at 1949 nm with a slope efficiency of 47.3%. The polarization extinction ratio of the laser was measured to be around 20 dB. The beam quality of the laser was near diffraction-limited, with of 1.1. The laser’s output features make it to be a potential light source for some important applications such as for pumping holmium-doped solid state lasers.