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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 2: Laser Systems
K 2.5: Vortrag
Dienstag, 10. März 2020, 15:00–15:15, f428
15 W Er3+:Yb3+-codoped fiber laser for in-band Er3+ pumping — •Marian Dürbeck, Phillip Booker, Omar de Varona, Michael Steinke, Peter Wessels, Jörg Neumann, and Dietmar Kracht — Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany
Single-frequency Er3+:Yb3+-codoped fiber amplifiers in MOPA configuration are promising candidates to fulfil the challenging requirements of 1.5 µm laser sources for the third generation of interferometric gravitational wave detectors (GWDs). However, typical high-power pump sources only come with high NA and thus require long double-clad fiber lengths favourable for non-linearities such as SBS. On the other hand, single-mode core-pumping sources only come in the form of a cascaded Raman laser with high complexity designs. In this work, we demonstrate a low-complexity and single-mode Er3+:Yb3+-codoped fiber laser centered around 1530 nm and off-peak pumped at 915 nm, as a pump source for core-pumped amplifiers. We optimized the laser resonator by testing different commercially available SM-Er3+:Yb3+ fibers and their respective lengths with different outcoupler reflectivites. We characterized the laser for up to 15.5 W of output power (stability, noise-performance, spectrum and beam profile) with a slope-efficiency of 42.2 % and confirmed the absence of detrimental Yb3+-ASE by optical spectrum measurements.