Two ways of marking are examined: by removing layer and by melting the layer and substrate. Experiments were performed with two types of lasers (in the visible λ1 = 578 nm and near infrared λ2 = 1, 06 μm) areas. The change of contrast in dependence from two technology parameters - power density and speed of marking were analyzed. The physical mechanism for marking to both methods was discussed. The intervals of power density and speed of marking are certain in order to obtaining optimum contrast.
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