title: Large-mode-area hybrid photonic crystal fiber amplifier at 1178  nm.
abstract: Amplification of 1178 nm light is demonstrated in a large-mode-area single-mode ytterbium-doped hybrid photonic crystal fiber, relying on distributed spectral filtering of spontaneous emission at shorter wavelengths. An output power of 53 W is achieved with 29 dB suppression of parasitic lasing. Further power scaling is limited by parasitic lasing.
authors: Sidsel R
authors: SR
authors: Petersen
authors: Mingchen
authors: M
authors: Chen
authors: Akira
authors: A
authors: Shirakawa
authors: Christina B
authors: CB
authors: Olausson
authors: Thomas T
authors: TT
authors: Alkeskjold
authors: Jesper
authors: J
authors: Lægsgaard