The invention relates to a method for ablating a surface layer (2) of a wall (P) by scanning said layer (2), comprising: a directional control step (E com) by a deflector (5) optical of a plurality of pulsed laser beams (7); a step (E ab) of ablation of the layer (2) on impact zones (I LC) created by the plurality of laser beams, each impact zone (I LC) being defined by a center (C) and by a characteristic dimension (d1, d2, d3); the method is characterized in that the impact zones (I LC) are disjoint, the distance (DI) between each center (C) of the impact zones (I LC) being equal to at least ten times the largest dimension characteristic (d1, d2, d3) of the impact zones. The invention also relates to a corresponding device.
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