BLACK SUB-ANODIZED MARKING USING PICOSECOND BURSTS
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United States of America Patent
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Jan 2, 2017
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Dec 31, 2015
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A method includes generating a plurality of pulse bursts with a predetermined quantity of intra-burst pulses in each pulse burst and a temporal spacing between the intra-burst pulses, and with a pulse burst frequency, and scanning the pulse bursts across an anodized target at a scan rate so that the pulse bursts overlap at the anodized target by an amount that is above an overlap damage threshold and the intra-burst pulses provide a peak power and peak fluence that are below an ablation threshold of the anodized target so as to produce a laser mark on the anodized target with an L value of less than or equal to 30 and without a damage to an anodized layer of the anodized target.
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