Nanosecond pulse shaping allowing 500 mJ injection in a single core multimode fiber for laser shock peening applications (Conference Presentation)

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.