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All-Fiber Counter-Propagation Pumped Single Frequency Amplifier Stage With 300-W Output Power

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4 Author(s)
Theeg, T. ; Laser Zentrum Hannover e.V., Hannover, Germany ; Sayinc, H. ; Neumann, J. ; Kracht, D.

We present a single frequency ytterbium-doped fiber amplifier, counter-propagation pumped with an all-fiber pump and signal combiner. The fiber combiner is capable of handling 440 W of pump power as well as the maximum achieved output power of 301 W. The threshold of stimulated Brillouin scattering of the high-power fiber amplifier was shifted from 175 to 280 W by external thermal management in combination with the pump-induced intrinsic temperature gradient.

Published in:

Photonics Technology Letters, IEEE  (Volume:24 ,  Issue: 20 )