All-fiberized, in-band pumped Ho-doped fiber laser Operating at 2.1 mu m

Abstract

An all-fiberized, in-band pumped Ho-doped fiber laser is presented. The laser is pumped by an in-house built Tmdoped fiber laser operating at 1.95 mu m, and its operation wavelength is stabilized by a high-reflection (HR) FBG at 2.1 mu m. 18.1 W output at 2.1 pm is generated by the laser, with a slope efficiency of 74.7 %.