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\label{Figure4} (left) \label{figDepEnergy} (A)  Amplitude of the shear wave versus laser beam power, log-log scale. Two linear dependences are observed: one from 10 to 30-40 mJ, with a slope of 1.05, and one from 30-40 mJ to 200 mJ, with a slope of 2.18. (right) (B)  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 increasing.