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A Nd:glass laser producing 20 J/pulse at selectable 10 ns to 30 ns pulse duration and 5 Hz repetition rate is used for laser peening. Stimulated Brillouin scattering phase conjugation maintains wavefront control to avoid internal optics damage at the 1000 MW peak power level. Recent research focuses on improving fatigue life of single crystal superalloys and slowing hydrogen induced cracking.
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