Patent ID: 6010787
Filing Date: 2000-01-04
Classification: C03B,C03C,Y10T

Abstract:
Glass compositions for a core/cladding distributed-index optical element produced by a thermal-interdiffusion process using a double crucible, said glass compositions comprising:a glass composition for the core containing 18 mol %<Li.sub.2 O.ltoreq.30 mol %, 0 mol %.ltoreq.Na.sub.2 O.ltoreq.12 mol %, 0 mol %.ltoreq.PbO.ltoreq.5 mol %, 8 mol %.ltoreq.MgO.ltoreq.18 mol %, 0.5 mol %.ltoreq.BaO.ltoreq.5 mol %, 1 mol %.ltoreq.TiO.sub.2 .ltoreq.10 mol %, and 40 mol %.ltoreq.SiO.sub.2 .ltoreq.65 mol % as major components, where 18 mol % <(Li.sub.2 O+Na.sub.2 O).ltoreq.30 mol %, 50 mol %.ltoreq.(SiO.sub.2 +TiO.sub.2).ltoreq.66 mol %, and 8 mol %.ltoreq.(MgO+PbO).ltoreq.22 mol %; anda glass composition for the cladding containing 18 mol % <R.sub.2 O.ltoreq.30 mol % (R.sub.2 O.dbd.Na.sub.2 O+K.sub.2 O), 0 mol %.ltoreq.PbO.ltoreq.5 mol %, 8 mol %.ltoreq.MgO.ltoreq.18 mol %, 0.5 mol %.ltoreq.BaO.ltoreq.5 mol %, 1 mol %.ltoreq.TiO.sub.2 .ltoreq.10 mol %, and 40 mol %.ltoreq.SiO.sub.2 .ltoreq.65 mol % as major components, where 50 mol %.ltoreq.(SiO.sub.2 +TiO.sub.2).ltoreq.66 mol %, and 8 mol %.ltoreq.(MgO+PbO).ltoreq.22 mol %.