Mitigating stimulated Brillouin scattering in multimode fibers with focused output via wavefront shaping

Chun-Wei Chen, Linh V. Nguyen, Kabish Wisal, Shuen Wei, Stephen C. Warren-Smith (), Ori Henderson-Sapir, Erik P. Schartner, Peyman Ahmadi, Heike Ebendorff-Heidepriem, A. Douglas Stone (), David J. Ottaway and Hui Cao ()
Additional contact information
Chun-Wei Chen: Yale University
Linh V. Nguyen: The University of Adelaide
Kabish Wisal: Yale University
Shuen Wei: The University of Adelaide
Stephen C. Warren-Smith: The University of Adelaide
Ori Henderson-Sapir: The University of Adelaide
Erik P. Schartner: The University of Adelaide
Peyman Ahmadi: Coherent
Heike Ebendorff-Heidepriem: The University of Adelaide
A. Douglas Stone: Yale University
David J. Ottaway: The University of Adelaide
Hui Cao: Yale University

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract The key challenge for high-power delivery through optical fibers is overcoming nonlinear optical effects. To keep a smooth output beam, most techniques for mitigating optical nonlinearities are restricted to single-mode fibers. Moving out of the single-mode paradigm, we show experimentally that wavefront-shaping of coherent input light to a highly multimode fiber can increase the power threshold for stimulated Brillouin scattering (SBS) by an order of magnitude, whilst simultaneously controlling the output beam profile. The SBS suppression results from an effective broadening of the Brillouin spectrum under multimode excitation, without broadening of transmitted light. Strongest suppression is achieved with selective mode excitation that gives the broadest Brillouin spectrum. Our method is efficient, robust, and applicable to continuous waves and pulses. This work points toward a promising route for mitigating detrimental nonlinear effects in optical fibers, enabling further power scaling of high-power fiber systems for applications to directed energy, remote sensing, and gravitational-wave detection.

Date: 2023
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DOI: 10.1038/s41467-023-42806-1

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