Creation of locally selective mirror surface on 40BaO-40TiO_2-20B_2O_3 glass by XeCl pulse laser irradiation

摘要

Creation of mirror dots, localized areas of smooth surface with a shape of laser beam on a glass material, using a XeCl laser irradiation is reported. Laser irradiation of a 40BaO-40TiO_2-20B_2O_3 sample heated to 300℃ induced a smooth and flat surface, where no scratches caused by a mechanical polishing were observed. The present finding indicates that the melting of the surface occurred by the combined effect of the heat-assistance and the increased absorption coefficient of TiO_2. In the present system, the absorption coefficient in the ultraviolet region, which originates from TiO_2, was found to increase with increasing temperature. The presented technique will open new possibilities in integrated optics; the surface of a small protruded or hollow area can be made smooth, which cannot be achieved by conventional mechanical polishing.