Development of laser-beam shaping method for retro-reflector fabrication on surface of metal substrate

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We proposed new laser micro-fabrication process for stainless steel substrate using beam-shaping method to make triangle-shaped beam. Then we confirmed the profiles of the beam. After pulse irradiation to metal surface, formation of two-dimensional micro structures with 2.5 micrometer in pitch were observed. On the other hand micro grooves with 4 micrometer in width and with 0.7 micrometer in depth were fabricated by focused beam irradiation. Although fabrication of retro-reflector on stainless steel substrate could not be achieved, this indicates possibility of the micro-fabrication technology of metal surface using interference pattern of short pulse.