大功率 CO_2激光器被广泛地应用于金属材料加工,但一般金属材料对波长10.6微米的 CO_2激光在常温下反射率很高,使激光功率的利用率很低.所以在激光热处理时,金属表面需要进行涂层处理,以增加表面对激光的吸收率.影响金属材料对激光的吸收机理目前尚不十分清楚。但是现象和经验表明,材料的导电性起着很大的作用.金属是很好的导体。各种金属内部都存在着大量的自由电子。由于集肤效应,自由电子 High-power CO2 laser is widely used in metal materials processing, but the general metal materials for CO2 laser wavelength 10.6 microns high reflectivity at room temperature, the laser power utilization is very low, so the laser heat treatment, the metal surface needs Coating treatment to increase the surface of the laser absorption rate.Metal material on the laser absorption mechanism is not yet clear. However, phenomena and experience show that the conductivity of the material plays a significant role. Metal is a good conductor. There are a large number of free electrons in various metals. Due to the skin effect, free electrons