METHOD AND APPARATUS FOR INTERNALLY MARKING A SUBSTRATE HAVING A ROUGH SURFACE
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United States of America Patent
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app pub date -
Dec 2, 2014
filing date -
Dec 5, 2013
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Abstract
A method for laser processing provides a coating material (130) applied to a rough surface (42) of a substrate (44) to mitigate adverse optical effects that would be caused by roughness of the surface (42). Laser pulses (52) of the laser output of suitable parameters can be directed and focused to internally mark the substrate (44) material without damaging the rough surface (42) after passing through the coating material (130).
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