Observation of Visible Upconversion Luminescence of Soft Glass Multimode Fibers by Mario Ferraro, Fabio Mangini, Raffaele Filosa, Vincent Couderc, Yifan Sun, Pedro Parra-Rivas, Wasyhun A. Gemechu, Grzegorz Stepniewski, Adam Filipkowski, Ryszard Buczynski, Stefan Wabnitz

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