Journal
OPTICS EXPRESS
Volume 22, Issue 7, Pages 7632-7637Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.007632
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We present a composite optical fiber with a Er/Yb co-doped phosphate-glass core in a silica glass cladding as well as cladding pumped laser. The fabrication process, optical properties, and lasing parameters are described. The slope efficiency under 980 nm cladding pumping reached 39% with respect to the absorbed pump power and 28% with respect to the coupled pump power. Due to high doping level of the phosphate core optimal length was several times shorter than that of silica core fibers. (C) 2014 Optical Society of America
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