Product Code: ICAL08_M1105

Inside Process of Glass with Nanosecond Pulsed Laser
Authors:
Takeji Arai, Chuo University; Tokyo Japan
Noritaka Asano, Chuo University; Tokyo Japan
Akihiko Minami, Coherent Japan Inc.; Tokyo Japan
Hideaki Kusano, Shimadzu Corp.; Tokyo Japan
Presented at ICALEO 2008

Glass is a useful material. Recently, the utility of the inside processing of the glass with the laser came to be recognized. The glass is heterogeneous as processing materials with the 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 the laser, the mechanism is very peculiar. Therefore it is said that control of the glass-processing 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 analyzed 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 lens effect of the refractive indexs curvature. When an internal small cavity (viod) led to surface of glass, a gaseous thing gushed out outside. From this, it was recognized that the inside of viod was filled with evaporation gas of glass materials.