| abstract |
The present invention provides a low-alkali or alkali-free glass for laser processing, the glass reducing occurrence of laser irradiation-induced cracks and allowing formation of circular through holes. The present invention relates to the glass for laser processing, the glass having a glass composition including, in mol %: 45.0%≤SiO2≤70.0%; 2.0%≤B2O3≤20.0%; 3.0%≤Al2O3≤20.0%; 0%≤ZnO≤9.0%; and (I) 0.1%≤CuO≤2.0% and 0%≤TiO2≤15.0%; or (II) 0.1%≤TiO2<5.0% and 0%≤CuO<0.1%, wherein, in the case of (II), a metal oxide serving as a coloring component is further included, a relationship of 0≤Li2O+Na2O+K2O<2.0% is satisfied, either of principal surfaces of the glass has a layer containing fine particles, and the fine particles have an average particle diameter of 10 nm or more and less than 1.0 μm. |