Rare Earth Co-Doping for Increased Efficiency of Resonantly Pumped Er-Fiber Lasers
Journal Article - Open Access
NAVAL RESEARCH LAB WASHINGTON DC WASHINGTON United States
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Rare earth co-doping of erbium with optically inactive ytterbium or lanthanum ions was investigated in silica fibers for resonant pumping of amplifiers and lasers. The co-dopants are optically inactive when pumped at 1475 nm and therefore their main role is to reduce erbium clustering in solution-doped fibers. We have demonstrated increased efficiencies compared to fibers where no co-dopants are used. With this technique, a single mode Er-La fiber with an Er ion concentration of 0.98x1025 ionsm3, exhibited a slope efficiency of 79.6 in a core-pumped master oscillator-power amplifier MOPA with a signal wavelength of 1560 nm.
- Lasers and Masers