Journal
OPTICS EXPRESS
Volume 30, Issue 24, Pages 44270-44282Publisher
Optica Publishing Group
DOI: 10.1364/OE.476160
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Funding
- European Research Council [835306]
- Fraunhofer-Gesellschaft (CAPS, Cluster of Excellence Advanced Photon Sources)
- Bundesministerium fur Bildung und Forschung [01DR20009A]
- Carl-Zeiss-Stiftung (EHLAP)
- European Research Council (ERC) [835306] Funding Source: European Research Council (ERC)
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Investigation of the influence of the pump wavelength on high-power amplification of large-mode area, thulium-doped fibers suitable for ultrashort pulsed operation in the 2 μm wavelength region. Results show that pumping at 1692 nm achieves higher slope efficiency and average output power compared to pumping at 793 nm.
We investigate the influence of the pump wavelength on the high-power amplification of large-mode area, thulium-doped fibers which are suitable for an ultrashort pulsed operation in the 2 mu m wavelength region. By pumping a standard, commercially available photonic crystal fiber in an amplifier configuration at 1692 nm, a slope efficiency of 80 % at an average output power of 60 W could be shown. With the help of simulations we investigate the effect of cross-relaxations on the efficiency and the thermal behavior. We extend our investigations to a rod-type, large-pitch fiber with very large mode area, which is exceptionally suited for high-energy ultrafast operation. Pumping at 1692 nm leads to a slope efficiency of 74% with a average output power of 67 W, instead of the 38 % slope efficiency obtained when pumping at 793 nm. These results pave the way to highly efficient 2 mu m fiber-based CPA systems. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
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