Transparent glass-ceramics

Details Transparent glass-ceramics Transparent glass-ceramics

C - Chemistry, Metallurgy

03

C

C03C 10/06 (2006.01) C03C 3/108 (2006.01) C03C 4/00 (2006.01) C03C 10/16 (2006.01) C03C 13/00 (2006.01) C03C 13/04 (2006.01) H01S 3/16 (2006.01) H04B 10/17 (2006.01)

Patent

CA 2175163

Described are optically active glass-ceramic articles. They are free from ZnO and ZnF2 exhibiting high optical clarity and containing essentially only one crystal phase consisting essentially, expressed in terms of mole percent, of SiO2 20-35 PbF2 19-23 AlO? 10-20 YF3 3-7 CdF2 19-34 and PrF? at a concentration in the range of about 50 to 650 ppm; and, a transparent glass covering the surface of said elongated central member, but leaving exposed said first and second ends, consisting essentially, expressed in terms of weight percent on the oxide basis, of SiO2 23-30 B2O3 1-10 Al2O3 0-3 PbO 49-60 Li2O 0-1 Na2O 0-2 K2O 5-11 BaO 0-8 Doped with Pr, Er, and Dy they are especially useful as waveguide amplifiers and lasers.

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