Single mode 4.3 kW output power from a diode-pumped Yb-doped fiber amplifier

Beier F, Hupel C, Kuhn S, Hein S, Nold J, Proske F, Sattler B, Liem A, Jauregui C, Limpert J, Haarlammert N, Schreiber T, Eberhardt R, Tuennermann A (2017)

Publication Type: Journal article

Publication year: 2017

Journal

Optics Express Optical Society of America

Book Volume: 25

Pages Range: 14892-14899

Journal Issue: 13

DOI: 10.1364/OE.25.014892

Abstract

We investigate the average power scaling of two diode-pumped Yb-doped fiber amplifiers emitting a diffraction-limited beam. The first fiber under investigation with a core diameter of 30 µm was able to amplify a 10 W narrow linewidth seed laser up to 2.8 kW average output power before the onset of transverse mode instabilities (TMI). A further power scaling was achieved using a second fiber with a smaller core size (23µm), which allowed for a narrow linewidth output power of 3.5 kW limited by stimulated Brillouin scattering (SBS). We mitigated SBS using a spectral broadening mechanism, which allowed us to further increase the output power to 4.3 kW only limited by the available pump power. Up to this power level, a high slope efficiency of 90% with diffraction-limited beam quality and without any sign of TMI or stimulated Raman scattering for a spectral dynamic range of higher than −80 dB was obtained.

Involved external institutions

Fraunhofer-Institut für Angewandte Optik und Feinmechanik (IOF) / Fraunhofer Institute for Applied Optics and Precision Engineering DE Germany (DE) Friedrich-Schiller-Universität Jena DE Germany (DE)

How to cite

APA:

Beier, F., Hupel, C., Kuhn, S., Hein, S., Nold, J., Proske, F.,... Tuennermann, A. (2017). Single mode 4.3 kW output power from a diode-pumped Yb-doped fiber amplifier. Optics Express, 25(13), 14892-14899. https://dx.doi.org/10.1364/OE.25.014892

MLA:

Beier, F., et al. "Single mode 4.3 kW output power from a diode-pumped Yb-doped fiber amplifier." Optics Express 25.13 (2017): 14892-14899.

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