Abstract
Stimulated Brillouin backscattering (SBS) is studied in multimode glass fibers with core diameters between 25 and 200 μm . The SBS threshold energy, and damage threshold were measured. High SBS reflectivities over 80% are obtained with 30 ns laser pulses at 1.06 μm wavelength. The experimental results regarding the SBS reflectivity are compared with an analytical calculation for a plane wave model of the SBS process. The Brillouin gain coefficient of the fibers appeared to be about equal to the bulk gain coefficient.
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