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Pol Grasland-Mongrain edited Dependance with beam power.tex
about 8 years ago
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The Finally, the dependence of the
generated shear wave amplitude
with versus laser energy was
finally quantitavely investigated
quantitatively by increasing the laser beam energy from 10 to 200 mJ.
Amplitude have been Amplitudes were averaged over four experiments for each energy level and successive energy levels were randomly chosen to avoid any time-related
bias and bias. In addition, impact location was changed after each laser emission to avoid any potential local degradation of the medium. Shear wave amplitude was measured as the mean square amplitude at t = 1 ms of the displacement between 0 and 10 mm of the medium surface,
which was an arbitrary location where shear waves
had demonstrated high amplitudes. Resulting measurements are illustrated in Figure \ref{figDepEnergy}. Two linear dependencies are observed: one from 10 to 40 mJ, with a slope of 1.05 (R$^2$ = 0.87), and one from 30
mJ to 200 mJ, with a slope of 2.18 (R$^2$ = 0.97). This is in accordance with the theory
which presents a linear dependence of the that displacement
with is linearly dependent on energy at low
energy, energies, i.e. in the thermoelastic regime as described in equation \ref{eq:deplThermoApprox},
and a quadratic dependence but quadratically dependent at high
energy, energies, i.e. in the ablative regime as described in equation \ref{eq:deplAblaApprox}.