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Wavelength dependence of maximal diffraction-limited output power of fiber lasers

: Otto, H.J.; Modsching, Norbert; Jauregui, Cesar; Limpert, Jens; Tünnermann, Andreas


Shaw, B.L. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers XII. Technology, Systems, and Applications : 9-12 February 2015, San Francisco, California
Bellingham, WA: SPIE, 2015 (Proceedings of SPIE 9344)
ISBN: 978-1-62841-434-9
Paper 93441Y, 6 pp.
Conference "Fiber Lasers - Technology, Systems, and Applications" <12, 2015, San Francisco/Calif.>
Conference Paper
Fraunhofer IOF ()

The threshold-like onset of mode instabilities is currently the main limitation for the scaling of the average output power of fiber-laser systems with diffraction limited beam quality. In this contribution wavelength shifting of the seed signal has been experimentally investigated in order to mitigate mode instabilities. Against the expectations, it is experimentally shown that the highest mode instabilities threshold is reached around 1030 nm and not for the smallest wavelength separation between pump and signal wavelength. This finding implies that the quantum defect is not the sole significant source for thermal heating in the fiber.