| 摘要 |
PURPOSE:To provide low m.p. high expansion glass with low reflectivity and scattering contg. about 50 mol% P2O5, having a high absorption coefficient in the vicinity of the central wavelength of laser beam, and leaving little bubbles in edge cladding. CONSTITUTION:Edge cladding glass of this invention consists of, by mol, P2O5; 46-63%, Al2O3; 4-8%, B2O3: 0-5%, K2O; 2-20%, Na2O; 0-15%, Li2O; 0- 14%, K2O+Li2O : 18-30%, CuO; 2-20%, ZnO; 0-15%, MgO; 0-5% and CuO +ZnO+MgO; 7-20%. Disc glass applicable to this cladding glass is fluorophosphate glass having an expansion coefficient alpha of 145-175X10<-7>/ deg.C (100-200 deg.C), a transition temp. Tg of 380-450 deg.C, and a refractive index nd of 1.44-1.48. |
