Coherent beam combining of two single-frequency 200W fiber amplifiers for gravitational wave detectors

Felix Wellmann; Nina Bode; Michael Steinke; Fabian Meylahn; Benno Willke; Ludger Overmeyer; Peter Weßels; Jörg Neumann; Dietmar Kracht

doi:10.1117/12.2578085

5 March 2021 Coherent beam combining of two single-frequency 200W fiber amplifiers for gravitational wave detectors

Felix Wellmann, Nina Bode, Michael Steinke, Fabian Meylahn, Benno Willke, Ludger Overmeyer, Peter Weßels, Jörg Neumann, Dietmar Kracht

Author Affiliations +

Proceedings Volume 11665, Fiber Lasers XVIII: Technology and Systems; 116651J (2021) https://doi.org/10.1117/12.2578085
Event: SPIE LASE, 2021, Online Only

Abstract

Gravitational wave detectors require single-frequency laser sources with challenging requirements regarding beam quality and noise properties. We developed a reliable single-frequency fiber amplifier architecture based on standard step-index large-mode-area fibers and coherently combined two high power beams to enable further power scaling. A combined power of 391 W could be achieved with a combining efficiency of approx. 92 %. The TEM00-mode content of the combined beam was analyzed and a higher-order-mode content of 6.8 % was measured. This yields 365 W linearly polarized output power in the TEM00-mode that is usable for the application.

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Felix Wellmann, Nina Bode, Michael Steinke, Fabian Meylahn, Benno Willke, Ludger Overmeyer, Peter Weßels, Jörg Neumann, and Dietmar Kracht "Coherent beam combining of two single-frequency 200W fiber amplifiers for gravitational wave detectors", Proc. SPIE 11665, Fiber Lasers XVIII: Technology and Systems, 116651J (5 March 2021); https://doi.org/10.1117/12.2578085

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