7 March 2014 Yb-free Er-doped all-fiber amplifier cladding-pumped at 976 nm with output power in excess of 100 W
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Abstract
Power scaling of Yb-free Er-doped fiber lasers is extremely challenging due to low Er ion absorption cross-section and growth of unbleachable loss at high Er concentrations because of clustering effects. Hence, usual double-clad Er-doped fibers suffer from low efficiency. We present an efficient high power all-fiber amplifier based on our newly developed Yb-free Er-doped fiber. Proper core composition and relatively low Er3+ concentration mitigates clustering effect. Furthermore, large single-mode core diameter of 34 um increases the pump absorption and decreases the fiber length. Our amplifier consists in the specialty Er fiber pumped through a commercially available pump combiner by means of 6 pigtailed multimode diodes (D=105 um, NA=0.15, input pump power of 275W). The signal source is a low power continuous wave fiber laser spliced to the amplifier. Therefore we built truly all-fiber laser without any free space coupling. We obtained 103 W of amplified signal limited only by the available pump power. Pump conversion efficiency is as high as 37 %. To the best of our knowledge this is the highest power ever demonstrated for Yb-free Er-doped lasers pumped at 976 nm. This power level is similar to that obtained in resonantly pumped Er-doped fiber lasers.
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Leonid V. Kotov, Leonid V. Kotov, Mikhail E. Likhachev, Mikhail E. Likhachev, Mikhail M. Bubnov, Mikhail M. Bubnov, Oleg I. Medvedkov, Oleg I. Medvedkov, Mikhail V. Yashkov, Mikhail V. Yashkov, Alexei N. Guryanov, Alexei N. Guryanov, Sébastien Février, Sébastien Février, Jérôme Lhermite, Jérôme Lhermite, Eric Cormier, Eric Cormier, } "Yb-free Er-doped all-fiber amplifier cladding-pumped at 976 nm with output power in excess of 100 W", Proc. SPIE 8961, Fiber Lasers XI: Technology, Systems, and Applications, 89610X (7 March 2014); doi: 10.1117/12.2038503; https://doi.org/10.1117/12.2038503
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