STUDY ON LASER BEAM SHAPING FOR ABLATION OF METALLIC FILM

Laser ablation result is related to the distribution of laser power density,especially for metal film ablation. A method of shaping laser power density distribution based on wave front diffraction transform was described in this paper,and a Laser optical diffraction component was designed and fabricated using this method.Verification experiment of laser power shaping ability was carried out using initial phase(TEM₀₀)and multi phase laser,and the result indicated that both of the original laser beams were transformed by employing diffractive optical component.Conversion efficiency of diffractive optical component is 71%for initial phase condition,and 53%for multi phase.