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Q-switched Nd:glass laser pulses of 60ns duration are transmitted through multimode fused-silica fibres of 0.4-1mm core diam and lengths of up to 20m. For laser radiation with narrow spectral width, stimulated Brillouin scattering (SBS) is observed for energies well below the threshold energy of fibre damage. The SBS threshold is shifted beyond the threshold of fibre damage through increasing the...
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