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Proceedings Paper

Low-noise, single-frequency 200 W fiber amplifier
Author(s): Felix Wellmann; Michael Steinke; Fabian Meylahn; Nina Bode; Benno Willke; Ludger Overmeyer; Peter Weßels; Jörg Neumann; Dietmar Kracht
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Paper Abstract

Gravitational wave detectors require single-frequency laser sources with challenging properties regarding beam quality, polarization, and noise properties. We developed a single-frequency fiber amplifier engineering prototype based on standard step-index polarization maintaining fibers and characterized the 200 W output beam with the complete set of measurements necessary to evaluate the system's performance with respect to the application requirements. The output beam has a TEM00-mode content of 94:8% at 200W and a polarization extinction ratio of 19 dB. In the crucial frequency range from 1 Hz to 100 kHz the frequency noise, relative power noise, and relative pointing noise measurements demonstrated low noise properties. In addition, the pointing noise below 100 Hz is the lowest reported for single-frequency amplifiers with 200W output power. SBS-free operation was demonstrated by monitoring the relative power noise in the MHz frequency range. The system was operated above 200W for 695 h and evaluated again after 650 h of operation. No signs of photodarkening were found.

Paper Details

Date Published: 21 February 2020
PDF: 7 pages
Proc. SPIE 11260, Fiber Lasers XVII: Technology and Systems, 1126013 (21 February 2020); doi: 10.1117/12.2543292
Show Author Affiliations
Felix Wellmann, Laser Zentrum Hannover e.V. (Germany)
Michael Steinke, Laser Zentrum Hannover e.V. (Germany)
Fabian Meylahn, Max-Planck-Institut für Gravitationsphysik (Germany)
Nina Bode, Max-Planck-Institut für Gravitationsphysik (Germany)
Benno Willke, Max-Planck-Institut für Gravitationsphysik (Germany)
Ludger Overmeyer, Laser Zentrum Hannover e.V. (Germany)
Leibniz Univ. Hannover (Germany)
Peter Weßels, Laser Zentrum Hannover e.V. (Germany)
Jörg Neumann, Laser Zentrum Hannover e.V. (Germany)
Dietmar Kracht, Laser Zentrum Hannover e.V. (Germany)

Published in SPIE Proceedings Vol. 11260:
Fiber Lasers XVII: Technology and Systems
Liang Dong, Editor(s)

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