Thulium- and holmium-doped high stability fiber amplifiers at 2 µm for next generation gravitational wave detectors

P. Baer; A. Elshani; M. Reiter; P. Cebeci; M. Giesberts; J. Ebert; M. Hoefer; D. Hoffmann

doi:10.1117/12.2649611

8 March 2023 Thulium- and holmium-doped high stability fiber amplifiers at 2 μm for next generation gravitational wave detectors

P. Baer, A. Elshani, M. Reiter, P. Cebeci, M. Giesberts, J. Ebert, M. Hoefer, D. Hoffmann

Author Affiliations +

Proceedings Volume 12400, Fiber Lasers XX: Technology and Systems; 124000J (2023) https://doi.org/10.1117/12.2649611
Event: SPIE LASE, 2023, San Francisco, California, United States

Abstract

Within the context of the E-TEST (Einstein Telescope EMR Site & Technology) project, Fraunhofer ILT develops thulium- and holmium-based seed sources and fiber lasers at app. 2 μm wavelength with highest demands on linewidth and stability for usage in a third-generation gravitational wave detector, the Einstein telescope. To fulfill the requirements, we develop a seed laser and a multi-stage fiber amplifier, consisting of holmium-doped fibers. Within this paper, we present our current laser concept and the first results of our dual-stage holmium-doped fiber amplifier stage. We achieve a low linewidth (< 2 MHz) output power of more than 5 W at a wavelength of 2095 nm. By using our in-house developed fiber laser simulation, we show that the efficiency of our amplifier is currently limited by pair induced quenching and the potential for further power scaling.

Conference Presentation

Citation Download Citation

P. Baer, A. Elshani, M. Reiter, P. Cebeci, M. Giesberts, J. Ebert, M. Hoefer, and D. Hoffmann "Thulium- and holmium-doped high stability fiber amplifiers at 2 μm for next generation gravitational wave detectors", Proc. SPIE 12400, Fiber Lasers XX: Technology and Systems, 124000J (8 March 2023); https://doi.org/10.1117/12.2649611

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