Environmentally friendly low-dispersion chalcogenide glass and preparation method thereof

Abstract

The invention discloses an environmentally friendly low-dispersion chalcogenide glass and a preparation method thereof. The chalcogenide glass comprises, by mass, 14-18% of Ge, 7-28% of Sb, 57-70% of Se, and 0-5% of Te. Composition components of the chalcogenide glass do not contain As, the Abbe number of the chalcogenide glass disclosed in the invention is higher than the Abbe number of As-containing chalcogenide glass Ge22As20Se58 of 119.55, the Abbe number of commercial Ge20 (Ge20Sb15Se65) of 100.58 and the Abbe number of commercial Ge28 (Ge28Sb12Se60) of 102.15, and the V8-12 of the chalcogenide glass is the ratio of (n10-1) / (n8-n12) and is 120-130; and the chalcogenide glass has a good infrared transmittance performance, can be stably produced in batches, and can be used in infrared night vision lenses. The preparation method of the environmentally friendly low-dispersion chalcogenide glass is characterized in that a glass raw material tube and a purified glass tube are respectively placed in two hearths with different temperatures, and glass is purified by controlling a temperature difference between the two hearths, so the highly pure chalcogenide glass with uniform optical quality and good infrared light transmittance is obtained.

Description

technical field [0001] The present invention relates to chalcogenide glass and its preparation, in particular to an environment-friendly low-dispersion chalcogenide glass and its preparation method. The Abbe number (V 8-12 =(n 10 -1) / (n 8 -n 12 )) Between 120-130, can be used for infrared night vision lens. Background technique [0002] With the rapid development of the automobile market and the increasing awareness of security, people have higher and higher requirements for automobile safety technology. The night vision system can help the driver navigate in the dark, so that the driver can see the driving environment clearly in both light and dark situations. As the environmentally friendly chalcogenide glass used in its optical system, it not only needs to meet the design requirements of high-performance vehicle-mounted night vision system lenses, but also requires glass lenses to have lower dispersion to reduce chromatic aberration and improve imaging quality. There...

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Problems solved by technology

[0003] To prepare chalcogenide glass with low dispersion properties, the traditional method is to add As to this type of glass, but As-based glass is toxic, and is prone to photodarkening, photobleaching, and poor optical stability.

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