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A) Experimental setup, employing a high repetition rate femtosecond laser system and a beam scanning system. B) Continuous irradiated areas are formed by overlapping consecutive laser pulses (ω0 = 19.4 µm) in two dimensions through a proper adjustment of the laser repetition rate (ν), the scanning speed (V), and the line separation (Δ). C) Several continuous areas are stacked by rescanning the same area n times.
