An ytterbium-doped photonic bandgap fiber amplifier operating at the long wavelength edge of the ytterbium gain band is investigated for high power amplification. The spectral filtering effect of the photonic bandgap efficiently suppresses amplified spontaneous emission at the conventional ytterbium gain wavelengths and thus enables high power amplification at 1178 nm. A record output power of 167 W, a slope efficiency of 61% and 15 dB saturated gain at 1178 nm have been demonstrated using the ytterbium-doped photonic bandgap fiber.
Bibliographical noteThis paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-18-16-16345. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Olausson, C. B. T., Shirakawa, A., Chen, M., Lyngsøe, J. K., Broeng, J., Hansen, K. P., Bjarklev, A. O., & Ueda, K. (2010). 167 W, power scalable ytterbium-doped photonic bandgap fiber amplifier at 1178nm. Optics Express, 18(16), 16345-16352. https://doi.org/10.1364/OE.18.016345