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Temperature measurements in an ytterbium fiber amplifier up to the mode instability threshold

: Beier, F.; Heinzig, M.; Sattler, B.; Walbaum, T.; Haarlammert, N.; Schreiber, T.; Eberhardt, R.; Tünnermann, A.


Ballato, J. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers XIII. Technology, Systems, and Applications. Proceedings : 3-18 February 2016, San Francisco, California, United States
Bellingham, WA: SPIE, 2016 (Proceedings of SPIE 9728)
ISBN: 978-1-62841-963-4
Paper 97282P, 7 S.
Conference "Fiber Lasers - Technology, Systems, and Applications" <13, 2016, San Francisco/Calif.>
Fraunhofer IOF ()

We report on the measurement of the longitudinal temperature distribution in a fiber amplifier fiber during high power operation. The measurement signal of an optical frequency domain reflectometer is coupled to an ytterbium doped amplifier fiber via a wavelength division multiplexer. The longitudinal temperature distribution was examined for different pump powers with a sub mm resolution. The results show even small temperature variations induced by slight changes of the environmental conditions along the fiber. The mode instability threshold of the fiber under investigation was determined to be 480W and temperatures could be measured overall the measured output power values.