High-refractive-index medium-expansion core material glass for medium-expansion optical fiber inverter and preparation method thereof

Abstract

The invention discloses a high-refractive-index medium-expansion core material glass for a medium-expansion optical fiber inverter, which is composed of the following raw materials: boric acid, quartz sand, aluminum hydroxide, calcium carbonate, zinc oxide, titanium dioxide, and barium carbonate , barium nitrate, zirconia, lanthanum oxide, niobium oxide, yttrium oxide, lead oxide. A method for preparing a high refractive index mid-expansion core material glass for a mid-expansion optical fiber inverter, comprising the following steps: 1) adding raw materials into a platinum crucible; 2) raising the temperature to a clarification temperature for clarification after the addition is complete; 3) completion of clarification Finally, the temperature is lowered to the pouring temperature, and cast into glass rods; 4) The formed glass rods are annealed after demoulding, cooled after heat preservation, and released at room temperature. The formula system of the present invention can be used for the core material glass of the medium-expansion optical fiber inverter, and the glass has a refractive index > 1.80, an expansion coefficient (68±5)×10-7 / °C, and a high glass transmittance. The softening temperature is 650-750°C, no crystallization occurs at 850°C for 2 hours, and the chemical stability is good.

Description

technical field [0001] The invention relates to a high-refractive-index medium-expansion core material glass for a medium-expansion optical fiber inverter and a preparation method thereof. Background technique [0002] The fiber optic image inverter has the characteristics of high resolution, clear transmission, small size and light weight. At present, it is mainly used to replace the relay lens system in low-light night vision devices, and is also widely used in devices that require image inversion. [0003] Because in the low-light night vision instrument, the fiber optic inverter needs to be sealed with the Kovar alloy, therefore, the fiber optic inverter needs to have the same expansion coefficient parameter as the Kovar sealing alloy. At present, the Kovar sealing alloy material commonly used in low-light night vision instruments in China is a high-expansion Kovar sealing alloy, and the expansion coefficient is (87±2)×10 -7 / °C, in order to improve the thermal stabili...

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Problems solved by technology

[0008] In the prior art, there is no formulation system that satisfies the product performance requirements and special manufacturing process requirements of optical fiber inverters at the same time, and the formulation systems provided by some existing documents or patents can only meet part of the requirements, such as CN1583622A "Arsenic-free, lead-free, Cadmium-free lanthanide optical glass NZLaF\NLaF, NLaSF, NZLaF), the NLaK exemplified in the NZLaK class disclosed in the invention 8 Nd1.7200±7×10 of the glass made of the best formula -4 , Vd50.41±0.7%; the NLaK exemplified in the NLaF class disclosed by the invention 3 The Nd1.7440±7×10 of the glass made by the best formula -4 , Vd44.91±0.7%; NLaF exemplified in NZLaF and NLaSF disclosed in this invention 31 The Nd1.8061±7×10 of the glass made by the best formula -4 , Vd40.73±0.7%; this patent focuses on providing arsenic-free and lead-free lanthanide optical glass that is environmentally friendly, and does not involve the expansion coefficient of optical glass and the ability to resist devitrification. However, for the requirements of fiber optic inverters, the ability to resist devitrification is a hard indicator. , prone to devitrification, making the optical fiber imager not capable of transmitting light

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