Journal
OPTICS EXPRESS
Volume 25, Issue 13, Pages 14892-14899Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.25.014892
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Funding
- Federal Ministry of Education and Research (BMBF) [13N13652]
- Fraunhofer and Max Planck cooperation
- EU [2015FOR0017, 13030-715, 2015FGR0107, B715-11011]
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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 mu m 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 (23 mu m), 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. (C) 2017 Optical Society of America
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