Laser marking systems in industry employ a co 2 laser and nd:yag, and some investigations have indicated that nd:yag lasers produce superior mark legibility on surfaces such as ceramics and plastics (27), the laser material interaction appears different in co 2 laser marking is attributable to surface sputtering while the yag laser marking is a. The laser mark will be black in color irrespective of viewing angle. figure 9: inadequate oxide layer thickness will cause the laser mark color to shift. figure 10: true black laser mark. 2. laser mark should be able to withstand passivation. the laser mark should not wash away post nitric passivation.. 62 yr old. recovering from full face lift eye and eyebrow lift. had one co2 laser treatment done a month ago. peeled normally, but the redness didn't go away. iced, aquaphor, vinegar baths. sides of my face have marks where the laser went, lighter spots on my chin and a few areas where the skin....
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