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\label{Figure4} (A) (left)  Amplitude of the shear wave versus laser beam power. A power, log-log scale. Two  linear dependence is observed, dependences are observed: one from 10 to 30-40 mJ,  with a threshold at low amplitude due slope of 1.05, and one from 30-40 mJ  to ambient noise. (B) Amplitude 200 mJ, with a slope  of the shear wave versus black disk diameter. A linear dependence 2.18. (right) Four displacements maps at t = 2.0 ms, for laser beam energies of 10, 30, 80 and 200 mJ. At low energy, a third half cycle is observed, which disappears when energy  is observed. increasing.