Hannover 2020 – scientific programme
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 2: Laser Systems
K 2.4: Talk
Tuesday, March 10, 2020, 14:45–15:00, f428
Pump Combiner with Chirally Coupled Core Fibers for Single Frequency All Fiber Amplifier — •Eike Brockmüller1,2, Sven Hochheim1, Peter Wessels1, Joona Koponen3, Tyson Lowder4, Steffen Novotny3, Jörg Neumann1, and Dietmar Kracht1 — 1Laser Zentrum Hannover e.V., Laser Development Department, Hollerithallee 8, 30419 Hannover, Germany — 2Universität zu Lübeck, Ratzeburger Allee 160, 23562 Lübeck, Germany — 3nLight Oy, Sorronrinne 9, 08500 Lohja, Finland — 4nLIGHT Inc., 5408 NE 88th Street, Vancouver, WA 98665, USA
To increase its sensitivity, the next generation of gravitational wave detectors requires single frequency lasers in a linearly polarized TEM00-mode with high output power. It was shown that fiber based amplifier systems can meet these requirements with low complexity. However, they are limited by the nonlinear effect of stimulated Brillouin scattering (SBS). The concept of a chirally coupled core (3C®) fiber allows single-mode operation with a large mode area core and therefore raises the limit for the onset of SBS. A key element of such an amplifier setup is the pump combiner. We present the development of a pump combiner using a side-pumping technology in which the pump light is coupled into an active 3C® fiber with the key advantage of an uninterrupted signal core and without the need of an additional fusion splice in the amplifier setup. This should lower the complexity, reduce power losses and increase the robustness of the amplifier system, which further emphasizes the high potential of fiber amplifiers as laser sources for the next generation of gravitational wave detectors.