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3 January 2023 Observation of cascade Brillouin processes in random distributed feedback Raman fiber lasers
A. E. Kirik, A. A. Aprelov, I. D. Vatnik, D. V. Churkin
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Proceedings Volume 12323, Quantum and Nonlinear Optics IX; 1232304 (2023) https://doi.org/10.1117/12.2644093
Event: SPIE/COS Photonics Asia, 2022, Online Only
Abstract
The optical feedback in random distributed feedback Raman fiber lasers is due to extremely weak Rayleigh backscattering, nevertheless it is capable of forming localized spectral modes at the generation threshold. Here we present experimental time-resolved observation of such ultra-narrow spectral modes, proving the presence of cascade Brillouin scattering during the generation. We realized a two-band optical heterodyning measurement system that allows studying the evolution of two arbitrary separated spectral regions with microsecond temporal and of-megahertz spectral resolution. Studying the occurrence rate for cascade Brillouin scattering, we found that it plays an important role in shaping the generation.
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A. E. Kirik, A. A. Aprelov, I. D. Vatnik, and D. V. Churkin "Observation of cascade Brillouin processes in random distributed feedback Raman fiber lasers", Proc. SPIE 12323, Quantum and Nonlinear Optics IX, 1232304 (3 January 2023); https://doi.org/10.1117/12.2644093
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KEYWORDS
Fiber lasers
Raman scattering
Heterodyning
Rayleigh scattering
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