Rapid identification of impurity in the material surface using mesh-assisted laser-induced plasma technique utilizing pulse CO₂ laser

Impurity analysis in the material surface urgently required in various fields such as material sciences and industries. In this research, a new technique was devised based on a pulse CO₂ laser. Technically, the surface of the almite material as a material target was covered by a metal mesh. To induce a big-size plasma, the pulse CO₂ laser was directed to the metal mesh at an inclining degree of 30° by a ZnSe lens. Using this present technique, some impurities including potassium and calcium in the surface of the almite sample can be detected with the limit of detection of 10 and 5 mg/kg, respectively.