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

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

SUBMITTER: Chen CW 

PROVIDER: S-EPMC10643398 | biostudies-literature | 2023 Nov

REPOSITORIES: biostudies-literature