Inside process of glass with nanosecond pulsed laser

Abstract

Glass is a useful material. Recently, the utility of the inside processing of the glass with laser came to be recognized. The glass is heterogeneous as processing materials with laser. When heat occurred in the inside of the glass, the crack occurs in a random course, and a phenomenon is complicated. In addition, in the case of inside processing with laser, the mechanism is very peculiar. Therefore it is said that complete control of the glass-processing by the laser is difficult. By nanosecond pulsed THG-YVO4 laser, laser processing of inside-glass was performed. The phenomenon that processing went in the glass inside was observed by a high speed video camera, and it was analysed in detail.As a result, the following became clear. The processing of the glass is just occurring in the laser beam path, and glass is processed on the beam direction. The phenomenon of the processing are related to an outbreak of the plasma, the change of the internal refractive index, a thermal lens effect of the refractive index’s curvature. When an internal small cavity (void) led to surface of glass, a gaseous thing gushed out outside. From this, it was recognized that the inside of void was filled with evaporation gas of glass materials.Glass is a useful material. Recently, the utility of the inside processing of the glass with laser came to be recognized. The glass is heterogeneous as processing materials with laser. When heat occurred in the inside of the glass, the crack occurs in a random course, and a phenomenon is complicated. In addition, in the case of inside processing with laser, the mechanism is very peculiar. Therefore it is said that complete control of the glass-processing by the laser is difficult. By nanosecond pulsed THG-YVO4 laser, laser processing of inside-glass was performed. The phenomenon that processing went in the glass inside was observed by a high speed video camera, and it was analysed in detail.As a result, the following became clear. The processing of the glass is just occurring in the laser beam path, and glass is processed on the beam direction. The phenomenon of the processing are related to an outbreak of the plasma, the change of the internal refractive index, a thermal lens effect of the refractive ind...