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We have recently demonstrated an Er:Yb fiber amplifier pumped off-peak at 940 nm which achieved 50.5% slope efficiency compared to 40.2% slope efficiency when pumped on-peak at 976 nm, the typical pumping wavelength for Er:Yb fiber. To further understand these results we implemented a model that predicts the behavior of high power Er:Yb-co-doped fiber amplifiers with strong correlation to data. Through this modeling effort, we were able to estimate the forward and backward energy transfer coefficients for the Er:Yb silicophosphate fiber used. We also conducted a theoretical cutback experiment to find the optimal amplifier fiber length for each pump wavelength.
Julia R. Limongelli,Scott D. Setzler, andDaniel Creeden
"Experimental and numerical analysis of high power Er:Yb co-doped fiber amplifiers", Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100831O (22 February 2017); https://doi.org/10.1117/12.2252300
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Julia R. Limongelli, Scott D. Setzler, Daniel Creeden, "Experimental and numerical analysis of high power Er:Yb co-doped fiber amplifiers," Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 100831O (22 February 2017); https://doi.org/10.1117/12.2252300