Power Scaling of Resonantly Cladding-Pumped, Yb-Free, Er-Doped LMA Fiber Lasers
ARMY RESEARCH LAB ADELPHI MD
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The results of the recent major efforts in power scaling of resonantly cladding-pumped Yb-free Er fiber lasers are presented. Commercially available Yb-free Er-doped large mode area Er60-20125 LMA DC fibers were tested in two regimes i, as a booster amplifier in a single-frequency SF MOPA configuration and, ii, in a Bragg grating FBG based narrowband fiber laser configuration. We obtained 28.5 W of output power at 1590 nm, the highest power reported so far out of Yb-free Er-doped LMA fiber with resonant cladding pumping. The achieved optical-to-optical conversion slope efficiency of 56.6 is also believed to be the highest efficiency ever reported from Yb-free Er-doped fiber laser with resonant cladding pumping.
- Lasers and Masers