Laser shock surface treatment applications, ie with plasma formation, require pulses of very high peak power and duration of the order of a few tens of nanoseconds. This processing technique are generally performed in free space due to the difficulties to inject such peak power in a single core fiber. We present a innovative method allowing to inject 500 mJ pulses at 1064 nm in a single core multimode fiber. This subsystem allows at once to secure the input interface of the fiber and to reduce the optical losses due to Brillouin scattering.
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