Self-focusing lens glass and its production process and ion exchanging furnace

Abstract

The present invention discloses a kind of self-focusing lens glass and its production process and ion exchanging furnace. The glass consists of SiO2 30-45 wt%, K2O 0-6 wt%, Na2O 5-12 wt%, ZnO 6-12 wt%, Tl2O 32-46 wt%, B2O3 2-10 wt%, and Nb2O 50-5 wt%, and has SiO2+B2O3 in 50-59 mol%, B2O3 or SiO2+B2O3 in 5-8 mol%, and average bridge oxygen number Y in the oxygen polyhedron of 3. The self-focusing lens glass producing process includes the following steps: preparing glass material, smelting, pouring, annealing, cold optical processing, grinding and polishing to form glass rod, drawing wire, ion exchanging, cold optical processing and filming. The ion exchanging furnace for the production is provided with three thermocouples with Kelvin scales inside the furnace, one acid-proof stainless steel inner container, three thermocouples in the furnace wall and one armored thermocouple.

Description

Technical field: [0001] The invention relates to optical glass, in particular to a self-focusing lens glass, a production method thereof and an ion exchange furnace used. Background technique: [0002] Radial variable refractive index lenses, that is, self-focusing lenses, have attracted special attention because of their small diameter, short focal length, large numerical aperture, and the ability to focus light beams and image objects. Therefore, it is a very important tiny optical basic component, which has important applications in optical fiber communication, optical fiber sensing, optical information processing and many other fields. However, there is a deviation between the imaging of the actual optical system and the imaging of the ideal optical system. This deviation of the imaging of the optical system is called the aberration of the system. After the self-focusing lens used for endoscopy is used for imaging, the image clarity is uneven, and the aberrations are ma...

AI Technical Summary

Problems solved by technology

[0003] Thanks to Tl 2 O has a large electrical susceptibility and is easy to ion exchange, usually Tl + Used in self-focusing lens glass, in order to increase the refractive index of the glass to increase the numerical aperture of the self-focusing lens, it is necessary to add Tl to the glass + The amount is very large, which will inevitably lead to an increase in the chromatic aberration of the lens after exchange, that is, an increase in aberration, which seriously affects the imaging quality of the lens