High power ytterbium fiber lasers at extremely long wavelengths by photonic bandgap fiber technology |
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Authors: | Akira Shirakawa, Christina B. Olausson, Hiroki Maruyama, Ken-ichi Ueda, Jens K. Lyngs ,Jes Broeng |
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Affiliation: | a Institute for Laser Science, University of Electro-Communications, 1-5-1 Chofugaoka, Chofu, Tokyo 182-8585, Japan;b NKT Photonics A/S, Blokken 84, DK-3460 Birkerød, Denmark |
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Abstract: | Yb-doped fiber laser operating at the long-wavelength edge (1150–1200 nm) 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 (1030–1100 nm) is strictly inhibited. We have recently demonstrated amplification with as high as 167 W output power and 61% slope efficiency at 1178 nm. The novel gain profiling technique by photonic bandgap fibers can be extended to other rare-earth doped fibers. |
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Keywords: | Fiber laser Fiber amplifier Ytterbium Photonic bandgap fiber Distributed filtering Amplified spontaneous emission |
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