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.
- BANDGAP FIBER
Petersen, S. R., Chen, M., Shirakawa, A., Olausson, C. B. T., Alkeskjold, T. T., & Lægsgaard, J. (2015). Large-mode-area hybrid photonic crystal fiber amplifier at 1178 nm. Optics Letters, 40(8), 1741-1744. https://doi.org/10.1364/OL.40.001741