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\label{figDepEnergy} Amplitude Experimentally measured amplitude  of the shear wave versus laser beam power using a log-log scale. Two linear dependencies are observed: one from 10 to 40 mJ, with a slope of 1.05, and one from 30 to 200 mJ, with a slope of 2.18. Four displacement maps at t = 2.0 ms are illustrated in on  the right, for laser beam energies of 10, 30, 80 and 200 mJ. At low energy, a third half cycle is observed, which disappears when energy increases.