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

Abstract

The present invention discloses a high refractive index middle-expansion core material glass for a middle-expansion optical fiber image inverter. The high refractive index middle-expansion core material glass comprises the following raw materials: boric acid, quartz sand, aluminum hydroxide, calcium carbonate, zinc oxide, titanium dioxide, barium carbonate, barium nitrate, zirconium oxide, lanthanum oxide, niobium oxide, yttrium oxide and lead oxide. The preparation method for the high refractive index middle-expansion core material glass comprises: 1) adding raw materials to a platinum crucible; 2) after raw material addition is completed, heating to achieve a clarification temperature so as to clarify; 3) after completing clarification, cooling to achieve a pouring temperature, and carrying out pouring molding to obtain a glass rod; and 4) carrying out demolding on the molded glass rod, annealing, carrying out thermal insulation, cooling, and discharging from the furnace at a room temperature. According to the present invention, the formula system can be used for the core material glass of the middle-expansion optical fiber image inverter, wherein the refractive index of the glass is more than 1.80, the expansion coefficient is (68+ / -5)*10<-7> / DEG C, the glass transmittance is high, the softening temperature is 650-750 DEG C, crystallization is not generated after thermal insulation for 2 h at a temperature of 850 DEG C, 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 formula system that can meet both the product performance requirements and the special manufacturing process requirements of fiber optic inverters. Some existing documents or patents provide formula systems Can only meet part of the requirements, such as CN1583622 A "Arsenic-free, lead-free, cadmium-free lanthanide optical glass (NZLaF\NLaF, NLaSF, NZLaF)", the NLaK8Nd1.7200±7×10-4, Vd50.41±0.7% of the glass made by the best formula; NLaK3 exemplified in the NLaF class disclosed in this invention sub>Nd1.7440±7×10-4, Vd44.91±0.7% of the glass made by the best formula; NLaF exemplified in NZLaF and NLaSF disclosed in this invention 31The Nd1.8061±7×10-4, Vd40.73±0.7% of the glass made by the best formula; Environmental pollution-free arsenic-free and lead-free lanthanide optical glass does not involve the expansion coefficient of optical glass and the problem of anti-devitrification ability. However, the anti-devitrification ability is a rigid requirement for optical fiber inverters. If the anti-devitrification ability is not strong, it is prone to devitrification during the multiple high-temperature thermal processing processes of drawing, melting and torsion of the optical fiber inverter, so that the optical fiber inverter does not have the ability to transmit light.

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