Glass compositions for core/cladding type distributed index opti

Details Glass compositions for core/cladding type distributed index opti Glass compositions for core/cladding type distributed index opti

1997-11-04

2000-01-04

Speer, Timothy

Stock material or miscellaneous articles

Coated or structually defined flake, particle, cell, strand,...

Rod, strand, filament or fiber

428426, 428428, 385123, 385126, 359341, 65405, D02G 300, G02B 602, B01D 2126

Patent

active

060107871

ABSTRACT:
Glass compositions for a core/cladding type distributed-index optical element produced by a thermal-interdiffusion process using a double crucible is provided. The glass compositions comprises a glass composition for 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 %; and comprises a glass composition for 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 %.

REFERENCES:
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patent: 3858964 (1975-01-01), Piesslinger et al.
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International Search Report, May 7, 1997.
EPO Search Report, Feb. 18, 1998.

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