Journal article
High power ytterbium fiber lasers at extremely long wavelengths by photonic bandgap fiber technology
Institute for Laser Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan1
NKT Photonics A/S, Blokken 84, DK-3460 Birkerød, Denmark2
Yb-doped fiber laser operating at the long-wavelength edge (1150–1200nm) of the broad gain spectrum has been investigated for yellow-orange sources. Power scaling in this region has been recently achieved by Yb-doped solid-core photonic bandgap fibers, in which the Yb gain profile is engineered by the sharp-cut, bandpass distributed filtering and therefore amplified spontaneous emission in the high-gain region (1030–1100nm) is strictly inhibited.
We have recently demonstrated amplification with as high as 167W output power and 61% slope efficiency at 1178nm. The novel gain profiling technique by photonic bandgap fibers can be extended to other rare-earth doped fibers.
Language: | English |
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Year: | 2010 |
ISSN: | 10959912 and 10685200 |
Types: | Journal article |
DOI: | 10.1016/j.yofte.2010.09.003 |