Yb-Doped and Hybrid-Structured Solid Photonic Bandgap Fibers and Linearly-Polarized Fiber Lasers Oscillating above 1160 nm. - Masahiro Kashiwagi; Katsuhiro Takenaga; Kentaro Ichii; Tomoharu Kitabayashi; Shoji Tanigawa; Kensuke Shima; Shoichiro Matsuo; Munehisa Fujimaki; Kuniharu Himeno (IEICE Trans. Electron., 2011)