How to choose optical Shi Ying glass suitable for specific applications?

The following factors should be considered when selecting optical Shi Ying glass suitable for specific applications:

I. Optical properties

light transmittance

For applications requiring high transparency, such as optical lenses, microscope slides and optical fibers in optical communication, Shi Ying glass with high transmittance in the working wavelength range should be selected. For example, the transmittance of Shi Ying glass used for camera lens in visible light band should be above 90% to ensure clear imaging and accurate color reproduction.

If it is Shi Ying glass used for ultraviolet (UV) irradiation equipment, such as the lampshade of UV curing lamp, it is necessary to choose Shi Ying glass with good light transmittance in the ultraviolet band (usually 200-400nm). For example, JGS1 type Shi Ying glass has high transmittance in the far ultraviolet band, which can meet the requirements of this kind of application.

Refractive index and dispersion characteristics

In optical imaging systems, such as telescopes and microscopes, the refractive index and dispersion of Shi Ying glass are key factors. In order to reduce chromatic aberration, it is necessary to choose Shi Ying glass with uniform refractive index and appropriate dispersion coefficient. For example, in the design of high-performance optical lens, Shi Ying glass with low dispersion can better correct chromatic aberration, and make different colors of light focus on the same plane, thus improving the imaging quality.

For some applications that need to control the optical path accurately, such as wavelength division multiplexing devices in optical fiber communication, the refractive index stability and accuracy of Shi Ying glass are particularly important. Because the slight change of refractive index may lead to the deviation of signal transmission, Shi Ying glass material with accurately known refractive index should be selected.

Second, the physical and chemical properties

Hardness and wear resistance

Shi Ying glass with higher hardness is needed for applications that are often subjected to friction or physical contact, such as optical windows and touch screens. The Mohs hardness of Shi Ying glass is about 7, and it has good wear resistance. However, the hardness and wear resistance of Shi Ying glass produced by different processes may be different. For example, Shi Ying glass with special strengthening treatment can be used in occasions requiring high wear resistance such as mobile phone screens.

If Shi Ying glass is used in grinding or polishing, its hardness will also affect the processing difficulty and quality. Shi Ying glass with higher hardness needs to use more suitable grinding materials and processes to avoid surface damage.

chemical stability

In a chemically corrosive environment, such as the optical components of observation windows or reaction vessels in chemical and pharmaceutical industries, Shi Ying glass with high chemical stability should be selected. Shi Ying glass has good tolerance to most acids (except hydrofluoric acid) and alkali. For example, in a chemical experimental device containing acidic or alkaline solution, Shi Ying glass can work stably for a long time, and its optical performance will not be affected by corrosion.

For Shi Ying glass used in high temperature and high humidity environment, such as outdoor optical sensors, its hydrolysis resistance is also very important. Shi Ying glass with good chemical stability can prevent the optical performance from decreasing due to water vapor erosion.

Third, the thermal properties

thermal expansivity

In the application environment where the temperature changes greatly, such as the observation window of high-temperature furnace and optical components in aerospace equipment, it is necessary to choose Shi Ying glass with small thermal expansion coefficient. Because Shi Ying glass with small thermal expansion coefficient changes little when the temperature changes, it can keep the shape and optical performance of optical elements stable. For example, for some high-precision optical instruments, the thermal expansion coefficient of Shi Ying glass is required to be in a lower range under the condition of temperature fluctuation, so as to ensure the accuracy of the instrument.

High temperature resistance

For high-temperature applications, such as tubes of high-temperature lamps and high-temperature process equipment in semiconductor manufacturing, Shi Ying glass with high temperature resistance should be selected. The melting point of Shi Ying glass is between 1713 and 1730℃, and the high temperature resistance of different types of Shi Ying glass is different. For example, in the manufacture of tungsten halogen lamps, it is necessary to use Shi Ying glass which can withstand high temperature (up to 1000℃) and will not soften and deform, so as to ensure the normal use and luminous performance of the lamps.

Fourth, the mechanical properties

Strength and toughness

The strength and toughness of Shi Ying glass are the factors that need to be considered in applications that bear large external forces, such as car headlights's lenses and sports optical equipment. Shi Ying glass with high strength can withstand greater pressure and impact without breaking. Although Shi Ying glass is usually brittle, its toughness can be improved by some strengthening techniques, such as ion exchange strengthening.

For Shi Ying glass that needs to be machined or installed, if Shi Ying glass lens is installed in the frame of optical instrument, its mechanical strength will also affect the feasibility of machining and installation. Shi Ying glass with sufficient strength is not easy to be damaged in drilling, cutting and other processing processes, and can maintain structural stability after installation.

V. Cost and Machinability

Cost factor

The prices of different types, specifications and quality grades of optical Shi Ying glass vary greatly. On the premise of meeting the application requirements, the cost factor should be considered. For example, for mass-produced ordinary optical products, such as Shi Ying glass lampshades in lighting lamps, Shi Ying glass varieties with lower cost can be selected; For high-end optical components in aerospace or semiconductor industry, although the cost is high, Shi Ying glass with high quality and high performance is needed because of its extremely high performance requirements.

workability

Consider the machinability of Shi Ying glass, including the difficulty of cutting, grinding, polishing and coating. For example, some Shi Ying glasses are prone to crack during cutting, while others can be processed smoothly by conventional cutting methods. For optical elements with complex shapes and high precision requirements, it is necessary to select Shi Ying glass which is easy to process and shape and can achieve the required precision through subsequent processes.