Laser-assisted Local Thermal Coloring
激光辅助局部热着色
标签：激光, 热着色, 局部氧化, 精准, 干涉色, 数控
数控激光（1064 nm，20–60 W，扫描速度 100–400 mm/s，光斑 0.05–0.1 mm）可在抛光紫铜上"写"出可设计的干涉色图形：功率密度对应膜厚，蓝紫色约需 30–40 nm 氧化膜。比火焰法精度高两个数量级，可复现渐变图案。关键参数是离焦量 ±1 mm 与扫描间距（光斑直径的 30–50%），过密会过热发黑。着色后必须立即封护。
CNC lasers (1064 nm, 20–60 W, 100–400 mm/s, 0.05–0.1 mm spot) can "write" designed interference colors on polished copper: power density sets oxide thickness, with blue-violet at roughly 30–40 nm. Two orders of magnitude more precise than torch work, and repeatable for gradient patterns. Keep defocus within ±1 mm and scan spacing at 30–50% of spot diameter — denser tracks overheat to black. Seal immediately after coloring. ---