Patent ID: 8805133
Filing Date: 2014-08-12
Classification: C03B,C03C,G02B,Y10T

Abstract:
1. An oxide glass composition, comprising: a glass network former of Tellurium (IV) oxide TeO2 of 65 to 90 mole percent, said Tellurium (IV) oxide having an absorption feature with an inherent absorption wavelength corresponding to its phonon energy peak; a glass intermediate of Lanthanum (III) oxide La2O3 of 0.2 to 15 mole percent, said Lanthanum (III) oxide having an absorption feature with an inherent absorption wavelength longer than that of Tellurium (IV) oxide; and a glass modifier MO of 0.2 to 35 mole percent where M is selected from Mg, Ca, Sr, Ba, Zn, Pb and Cd, said modifier having an absorption feature with an inherent absorption wavelength longer than that of Tellurium (IV) oxide; a non-zero amount of halide of less than 0.5 mole percent, said halide having an absorption feature with an inherent absorption wavelength longer than that of Tellurium (IV) oxide; and wherein said oxide glass composition is substantially free comprising less than 0.1 mole percent of each of the following, Sodium Oxide Na2O; Hydroxide OH—; and any other passive glass constituent having an absorption feature with an inherent absorption wavelength shorter than that of Tellurium (IV) oxide, wherein said glass exhibits an optical loss of less than 2 dB/m from 0.6 microns to 4.5 microns.