When a high repetitive rate YAG laser pulse acts on a metal surface used as one of two electrodes, a plasma plume is produced, and a discharge occurs between the electrodes at a voltage far below breakdown threshold. So the discharge is controlled by the laser pulse. The metal surface is textured by a distribution of discharge craters. It is shown that the shape of discharge craters is determined by current waveform, electrical polarity and medium between electrodes. The relationship between diameter of craters and parameters of power supplier are investigated, especially for the three electrode materials, such as steel, iron and brass.