In this paper, learn about a polarization-maintaining Yb-doped large mode area fiber with depressed-index inner cladding layer and confinement of rare-earth dopants which has been drawn as a long-tapered fiber.
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V. Roy, C. Paré, B. Labranche, P. Laperle, L. Desbiens, M. Boivin, and Y. Taillon "Yb-doped large mode area tapered fiber with depressed cladding and dopant confinement", Proc. SPIE 10083, Fiber Lasers XIV: Technology and Systems, 1008314 (22 February 2017); https://doi.org/10.1117/12.2250864