Halide glass medium containing trivalent uranium ions and process for producing said medium
AssigneeFrance Telcom Etablissement Autonome de Droit Public
InventorsJacques Lambard, Hubert Poignant
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Abstract
Said medium is a halide glass (2, 8, 12, 20) containing uranium ions at least partly in the form U.sup.3+ and having, at least at one point of a region of the near infrared between 2.2 and 3.4 micrometers, an optical attenuation not exceeding 0.01 cm.sup.-1. For the production thereof, preparation takes place of a halide glass containing uranium ions, at least partly in the form U.sup.4+ and/or U.sup.5+, and having at least at this point the aforementioned attenuation. The glass is exposed to ionizing radiation able to produce trivalent uranium ions from the uranium ions of the prepared glass. Application to the production of optical guides, whereof the guiding parts are formed from such a medium.
Claims17
An optical light guide including a light guidance glass and a sheath or substrate glass means having a refraction index below that of the guidance glass, said guidance glass being formed of a fluoride glass selected from the group consisting of fluoroberyllate glasses, fluorozirconate glasses, fluorohafnate glasses, fluorozirconohafnate glasses, fluoroaluminate glasses, mixed fluorozirconoaluminate glasses, mixed fluorohafnoaluminate glasses, and mixed fluorozirconohafnoaluminate glasses, said fluoride glass containing between 1 ppm and 10,000 ppm of trivalent uranium ions and at least one point of a near infrared region between 2,2 and 3.4 micrometers, optical losses not exceeding 4.3 dB.m.sup.-1.
Dependencies are inferred from the claim text.