Laser ablation arrangement and method

A laser ablation method for coating a substrate, which method comprises the steps of

• emitting laser pulses by at least one laser source,
• controlling rotation of at least two controllable scanning mirrors, each around its axis, respectively, by a control unit;
• controlling an optical switch for guiding the laser pulses from the optical switch to a single selected scanning mirror at a time;
• wherein the scanning mirrors rotate synchronized at same angular velocity with one another, emitted laser pulses are pointed on a selected scanning mirror and reflected pulses are pointed at a selected target from among the at least two targets, and each of the at least two targets has an ablation surface in a form of a circular arc;
• and
• switching emitted laser pulses from one scanning mirror to another scanning mirror in selected time periods so that ablated material is detached from the at least two targets consecutively, in order to form a coating on the substrate.