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Pressure waveforms calculated in the main focus at (0, 0, 130 mm) – (a) and in the secondary focus at (0, 4.6 mm, 130 mm) – (b) for linear beam focusing (1) and accounting for nonlinear effects for I0 = 20 W·cm−2 (curves 2) and I0 = 40 W·cm−2 (curves 3). Some elements of the array are switched off to prevent rib heating. The waveforms are normalized to the initial pressure amplitude at the array elements
