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11 March 2016 Extremely low NA Yb doped preforms (<0.03) fabricated by MCVD
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We report the fabrication of extremely low NA preforms (<0.03), highly doped with Yb using a conventional Modified Chemical Vapor Deposition (MCVD) system. Our lowest NA preform (0.025 NA) was drawn to a 52um core step-index double-clad fiber operating in a single mode regime (M2=1.04). The fiber had a mode field diameter (MFD) and an effective area (Aeff) greater than 35um and 1000um2 respectively. In a fiber laser configuration, the efficiency was greater than 85% without any sign of photodarkening. To the best of our knowledge, by using our extremely low NA preforms we have demonstrated the largest MFD and Aeff to date for a single-mode step index double–clad Yb doped fiber without involving any micro-structuration.
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Vincent Petit, Richard P. Tumminelli, John D. Minelly, and Victor Khitrov "Extremely low NA Yb doped preforms (<0.03) fabricated by MCVD", Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97282R (11 March 2016);

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