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11 March 2016 Temperature measurements in an ytterbium fiber amplifier up to the mode instability threshold
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Abstract
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.
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F. Beier, M. Heinzig, Bettina Sattler, Till Walbaum, N. Haarlammert, T. Schreiber, R. Eberhardt, and A. Tünnermann "Temperature measurements in an ytterbium fiber amplifier up to the mode instability threshold", Proc. SPIE 9728, Fiber Lasers XIII: Technology, Systems, and Applications, 97282P (11 March 2016); https://doi.org/10.1117/12.2212423
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