Toward a holmium doped multimode fiber amplifier with high quality focused output using wavefront-shaping

Linh V. Nguyen; Michael Oermann; Dmitrii Stepanov; Ka Wu; David Lancaster; Shahraam Afshar; David Ottaway; Heike Ebendorff-Heidepriem; Stephen C. Warren-Smith

doi:10.1117/12.2687927

12 March 2024 Toward a holmium doped multimode fiber amplifier with high quality focused output using wavefront-shaping

Linh V. Nguyen, Michael Oermann, Dmitrii Stepanov, Ka Wu, David Lancaster, Shahraam Afshar, David Ottaway, Heike Ebendorff-Heidepriem, Stephen C. Warren-Smith

Author Affiliations +

Proceedings Volume 12865, Fiber Lasers XXI: Technology and Systems; 1286518 (2024) https://doi.org/10.1117/12.2687927
Event: SPIE LASE, 2024, San Francisco, California, United States

Conference Poster

Abstract

Lasers and amplifiers at 2.1 μm window are of great interest for applications that require high atmospheric transmission. To date, fiber lasers and amplifiers operating at this wavelength are based on single-mode Holmium Doped Fibers (HDF) so that a high-quality output beam can be obtained. However, as can be referred from the case of ytterbium doped fiber power amplifier, limiting nonlinear and thermal effects such as Stimulated Brillouin Scattering (SBS) and Transverse Mode Instability (TMI) will become obstacles in scaling single-mode holmium doped fiber amplifiers into the multi-kW power regime. The use of multimode HDF can help to mitigate the SBS and TMI effects, facilitating future power scaling of HDF amplifiers (HDFA). Here we propose and experimentally demonstrate a multimode HDF amplifier where the typical speckle pattern output is shaped into a quality focus by wavefront-shaping the amplifier’s input seed.

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

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Linh V. Nguyen, Michael Oermann, Dmitrii Stepanov, Ka Wu, David Lancaster, Shahraam Afshar, David Ottaway, Heike Ebendorff-Heidepriem, and Stephen C. Warren-Smith "Toward a holmium doped multimode fiber amplifier with high quality focused output using wavefront-shaping", Proc. SPIE 12865, Fiber Lasers XXI: Technology and Systems, 1286518 (12 March 2024); https://doi.org/10.1117/12.2687927

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