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22 March 2013 High order ribbon fiber modes, simulations, and experiments for high power fiber amplifiers
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Abstract
Diffraction limited fiber amplifiers in a circular geometry are likely to be limited by nonlinearities to 2 kW for narrowband and 10-36 kW for broadband lasers. We have proposed a ribbon fiber geometry to allow scaling fiber lasers above these limits in which a high order ribbon mode is amplified and converted back to the fundamental mode in free space. Novel methods of illuminating a high order ribbon fiber mode are discussed and compared with modeling and experimental results showing high purity illumination, > 90%. A 10 kW single frequency ribbon fiber amplifier design is presented and BPM simulation results verify the approach.
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Derrek Drachenberg, Michael Messerly, Paul Pax, Arun Sridharan, John Tassano, and Jay Dawson "High order ribbon fiber modes, simulations, and experiments for high power fiber amplifiers", Proc. SPIE 8601, Fiber Lasers X: Technology, Systems, and Applications, 860107 (22 March 2013); https://doi.org/10.1117/12.2001920
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