News

The core function of coated optical glass is to regulate its optical properties through surface coating, optimize its light performance, and meet the professional needs of different scenarios. ‌ Improve transparency and reduce reflection glare By coating an anti reflective film, the reflectivity of the glass surface can be significantly reduced, increasing the glass transmittance from about 96% without coating to over 99.5%. This can effectively reduce glare and stray light, making imaging clearer and brighter. It is widely used in optical equipment such as camera lenses, telescopes, microscopes, etc. Regulating thermal radiation to achieve energy-saving and thermal insulation Heat reflective coated glass can reflect infrared rays, block solar thermal radiation from entering indoor/car interiors, lower temperatures by 5-10 ℃ in summer, and reduce air conditioning energy consumption; Low-E coated glass can block indoor heat from radiating outward, reduce heat loss in winter, and meet the energy-saving needs of different regions in the north and south. Protection and safety enhancement Block over 90% of ultraviolet rays, prevent furniture and fabrics from fading, and protect human skin from UV damage; The coating layer can enhance the surface hardness of the glass, resist scratches, acid and alkali erosion, and extend the service life of the glass; After coating the front gear of the car, rainwater quickly slides off in rainy weather, reducing fog condensation and improving driving safety. Realize special optical functions Different functional coatings can achieve diverse optical effects: high reflective coatings can be used for mirrors and solar panels to improve reflection efficiency; Conductive coating can be used in scenarios such as glass heating defrosting and LCD display screens; Special coloring/spectral coating can meet professional optical needs such as filtering, spectral analysis, and color adjustment.

K9 (BK7) is a borosilicate crown glass that has become the preferred substrate for most optical components due to its balanced optical properties, stable physical and chemical properties, and extremely high cost-effectiveness. 1. Imaging optical system Various types of lenses: used in the lens assembly of mobile phones, digital cameras, and security monitoring equipment to produce convex and concave lenses for focusing, zooming, and aberration correction; Observation equipment: as the objective and eyepiece of telescopes and sights, as well as the core optical components of microscopes; Display projection: Form a projector lens group to ensure clear and sharp projected images. 2. Prism type components Turning prism: such as the Paul prism in binocular telescopes, which uses total reflection to fold the optical path and correct the mirror image; Splitting prism: used in laser experiments and optical measurements to divide a beam of light into multiple beams in proportion. The low dispersion characteristic of K9 (BK7) can reduce the color difference effect after splitting. 3. Application of laser technology As the base material for low to medium power laser mirrors, output mirrors, and beam expanders, it can be used after surface coating with optical thin films. It is widely used in laser marking, cutting, and welding equipment, and the cost is much lower than special materials such as quartz. 4. Precision measurement and scientific research instruments Optical reference: As an optical flat crystal, it is a reference measuring tool for detecting the flatness of workpieces; Interferometer components: For example, the splitter plate and compensation plate of the Michelson interferometer are made of K9; Window protection film: The front protection window of microscopes, spectrometers, and CCD cameras isolates dust and moisture while ensuring light transmission. The light transmission range covers 350nm-2100nm, fully meeting the testing requirements from visible light to near-infrared region. 5. Filter substrate The vast majority of bandpass and cutoff optical filters are coated on K9 glass substrates and are the core substrates for machine vision and mobile phone camera modules (such as infrared cutoff filters).

Neutral gray glass is widely used in fields such as photography, optical instruments, architectural decoration, and industrial testing, which can uniformly reduce light intensity without changing color balance. Photography and videography: As an ND filter (medium gray lens), it is used to control the amount of light entering, achieve shooting with a large aperture or extend exposure time under strong light, and create dynamic blur effects such as misty flowing water and blurred crowds. Optical equipment: In microscopes, telescopes, spectrometers, and other instruments, it protects sensors from damage caused by excessive light exposure while maintaining the authenticity of image colors. Laser and Research System: Used to adjust the intensity of laser beams and support the need for light intensity control in precision experiments. Security and medical equipment: applied to surveillance cameras, endoscopes, etc., optimizing imaging lighting conditions, improving visual clarity and safety. Architecture and interior design: used for curtain walls, partitions, doors and windows, etc., to reduce visible light transmittance (30% -60%), reduce glare and solar heat gain, enhance visual comfort and energy-saving performance. Smoke gray glass is also used as a soft decoration element to create a sophisticated and peaceful spatial atmosphere. Industrial Inspection and Measurement: In automated vision systems, controlling lighting intensity to avoid overexposure of images and ensure data accuracy.

Choosing absorption type color temperature rising glass is widely used in fields that require adjusting the color temperature of light sources, especially in scenes that pursue precise color reproduction and light quality. Photography and videography: In film and television shooting, using SSB200 and other color temperature glass can correct yellowish light sources (such as incandescent lamps) to daylight color temperature, making the color of the picture more realistic and natural. Movie production: used in lighting systems to enhance the color temperature of artificial light sources, simulate daylight effects, and ensure color consistency in multi scene shooting. Stage lighting: Adjust the color of the light through filters to enhance the visual expression of the stage and create a specific atmosphere. Scientific instruments: used in spectroscopic analysis, microscopic imaging, and other equipment to precisely control the color temperature of incident light and improve measurement accuracy. Medical imaging: Auxiliary optical equipment obtains clearer and more accurate color images, supporting diagnostic analysis. Display technology and projection system: Optimize light source output, enhance color expression and visual comfort of display devices. Artistic creation: used in lighting art installations to create specific cool toned light and shadow effects.

Bandpass filter glass is an optical component that only allows light within a specific wavelength range to pass through, while blocking light waves outside of that range. Its spectral characteristics exhibit a "middle transparency, two side cutoff" pattern and are widely used in optical detection, imaging systems, and optical communication fields. This type of glass is also known as a specific implementation form of bandpass filter, usually manufactured based on the principle of multi-layer thin film interference, which can accurately screen the target wavelength band of light in complex light environments, like an "optical sieve". It is commonly used in devices that require high wavelength selectivity, such as fluorescence analyzers, enzyme-linked immunosorbent assay (ELISA) analyzers, infrared cameras, iris recognition systems, etc. Core characteristic parameters The key performance of bandpass filter glass is defined by the following parameters: Center wavelength (CWL): The peak transmission wavelength of the passband, such as 470nm, 650nm, or 850nm. Half width at half maximum (FWHM): The wavelength width at which the transmittance drops to half of its peak, reflecting the width of the passband. The full width at half maximum of narrowband filters is usually less than 5nm. Peak transmittance: The maximum transmitted light intensity at the center wavelength, which can reach over 90% for high-quality products. Cut off depth: The minimum transmittance of the out of band region, usually expressed in OD value (optical density), such as OD4 representing only 0.01% of light energy leakage. Shortwave and longwave cutoff wavelengths: represent the starting and ending positions of the passband, respectively.

Absorption type color temperature reducing glass is widely used in fields that require adjusting the color temperature of light sources, especially in photography, stage lighting, architectural lighting, and other scenes. Photography and videography In film and television shooting, the color temperature of ambient light sources may not match the ideal white balance. Filter made of color reducing glass such as SJB130 can absorb the cool blue light component, reduce the color temperature of the light source, make the image light warmer and more natural, avoid color deviation, and improve imaging quality. Stage lighting Stage lighting design pursues atmosphere and emotional expression. Reduced color temperature glass can convert high color temperature white light into warm yellow light, creating warm, nostalgic or dramatic light and shadow effects, enhancing the audience's immersive experience. Architecture and Interior Lighting In commercial or residential lighting, the use of color reducing glass can adjust cool white light to soft warm light, enhancing spatial comfort. It is suitable for places such as hotels, restaurants, and living rooms that need to create a warm atmosphere. Display and Projection Technology In projection systems or high-end display devices, color temperature reducing glass is used to correct the color temperature of light sources, ensuring accurate color reproduction and enhancing visual comfort. Medical Imaging and Scientific Instruments In specific optical detection equipment, precise control of the color temperature of the light source helps to improve imaging contrast and analysis accuracy. The color temperature reducing glass, as one of the optical components, participates in optical path adjustment.

Neutral gray optical glass is an optical material that uniformly reduces light of various wavelengths in the visible spectrum range (usually 400-700nm). Its core characteristic is "neutrality" - that is, it reduces light intensity without changing the color balance and contrast of the light. It is widely used in fields such as photography, videography, laser systems, scientific instruments, and industrial testing. 1、 Basic Principles and Optical Characteristics Neutral gray optical glass achieves non selective absorption of light energy by doping specific optical absorbing substances (such as nickel, cobalt, iron oxides, etc.) into the glass substrate, ensuring a flat transmission curve throughout the visible light range and avoiding color cast or distortion. This "neutral" characteristic enables it to accurately reproduce the color of the scene in both color and black and white imaging. The key parameters include: Average transmittance (T_p): refers to the arithmetic mean of the transmittance measured every 20nm in the wavelength range of 400-700nm, and is a core indicator for measuring the ability to reduce light. Maximum allowable deviation (Q): Refers to the maximum absolute difference between the actual transmittance and the average value, reflecting spectral consistency. The Q value of high-quality products is usually controlled within ± 5%. Thickness influence: The standard test thickness is mostly 2mm, and in practical applications, the dimming effect can be adjusted by adjusting the thickness or using a combination.

Cut-off optical glass is an optical material capable of selectively transmitting or blocking light within specific wavelength ranges. It is widely used in optical imaging, spectral analysis, photography equipment, and industrial inspection. Its core function is to achieve a sharp spectral division at a specific wavelength (referred to as the "cut-off wavelength"), creating high-transmission and high-blocking regions to precisely control light propagation. 1. Basic Classification and Working Principles Stop-type optical glass is primarily divided into two categories: Long-pass filter (short-wave cutoff type): Allows long-wavelength light to pass while blocking short-wavelength light, such as red or infrared glass. Short-wave pass filter (long-wave cutoff type): Allows short-wavelength light to pass while blocking long-wavelength light, such as ultraviolet or blue glass. Based on the mechanism of action, it can be categorized as: Absorption type: Relies on metal ion doping (e.g., copper, cadmium sulfide) in the glass body to absorb specific wavelength light, such as Schott BG47 blue glass enhancing infrared absorption capacity through copper ions. Thin-film interference type: Multiple dielectric films are deposited on the substrate to achieve spectral selectivity through optical interference effects, commonly used in high-precision optical systems. Combined Type: Integrates absorption and interference technologies to enhance cutoff steepness and blocking depth, suitable for complex optical environments.

Quartz glass is widely used in the following fields due to its high temperature resistance, high purity, chemical stability, and excellent optical properties: semiconductor industry As the core material of chip manufacturing, it is used for diffusion furnace tubes, wafer cleaning equipment, etc., accounting for 45% of the market share. For example, the carrier devices and cavity consumables required for etching, diffusion, oxidation and other processes. Optical field Used for photolithography machine mask substrates (transmittance>95%), space telescope lenses, and laser weapon components. Like the laser reflector used in the Apollo moon landing experiment in the United States. aerospace Used for spacecraft wind tunnels, observation windows, satellite solar panels, and fighter jet antenna covers, resistant to extreme environments. The window material of China's Shenzhou spacecraft is made of quartz glass.

  1、 Optical Instruments and Industrial Testing Filter element: used in microscopes, spectrometers and other equipment to achieve ultraviolet signal acquisition and visible light interference filtering. Industrial testing: such as material composition analysis, ultraviolet intensity measurement, and other scenarios. 2、 Medical and Biological Fields Medical equipment: skin detectors, ultraviolet therapy devices, etc., use specific ultraviolet bands (such as 365nm) for diagnosis or treatment. Biological experiments: used for experiments that require UV excitation, such as fluorescence observation and DNA analysis. 3、 Consumer Electronics and Security Currency verification equipment: Identify anti-counterfeiting UV markings on banknotes. Security monitoring: Enhance the UV imaging effect at night or in low light environments. 4、 Research and Special Applications Photochemical research: as a reaction vessel or window material, controlling specific wavelengths of ultraviolet light to participate in the reaction. Cultural relic protection: Filter harmful ultraviolet rays and protect exhibits from fading.

Colored optical glass is an optical material that exhibits a specific color by adding specific materials such as metal oxides and rare earth metals. This type of glass not only retains good optical properties, but also has applications in multiple industries due to its unique color and optical properties. Definition and Characteristics Colored optical glass is made by adding colorants (such as metal oxides, rare earth metals, etc.) to change the color of the glass while maintaining its optical properties. This type of glass has selective absorption and transmission properties for specific wavelengths of light (visible light, ultraviolet light, or infrared light), and is therefore also known as filter glass Types and Applications Red colored optical glass: mainly used to reduce yellow light components, enhance display brightness and contrast, commonly used in mobile phone camera lenses, color filters, etc. Green colored optical glass: It has good infrared transmittance and is suitable for fields such as night vision goggles and infrared cameras. Blue colored optical glass: used in the manufacturing of optical devices such as spectrometers, lasers, LEDs, etc., to help eliminate aerosol phenomena. Yellow colored optical glass: used in the field of lighting to prevent ultraviolet radiation and provide sufficient brightness and brightness. Purple, brown, gray and other colored optical glass: These colors of glass also have their specific application industries, such as purple and brown glass commonly used for decoration and special optical equipment

    Preparation process and coloring mechanism of colored optical glass The preparation process of colored optical glass is similar to that of colorless optical glass, but the requirements for its spectral characteristics are lower. The coloring mechanism mainly includes ion coloring, metal colloid coloring, and sulfide selenium compound coloring. Rare earth elements such as cerium and neodymium are commonly used for coloring, achieving specific color effects by changing the transmittance or adjusting the refractive index. Historical background and development trend The history of colored optical glass can be traced back to early research and application of optical materials. With the development of technology, colored optical glass is becoming increasingly widely used in fields such as color photography, night vision equipment, and laser technology. In the future, with the advancement of new materials and preparation technologies, the performance and application scope of colored optical glass will be further expanded. In short, colored optical glass, as an important filtering material, not only has a wide range of applications in the field of optics, but also plays an indispensable role in modern technology.

       High borosilicate glass is a special glass material with low expansion rate, high temperature resistance, high strength, and high chemical stability. Its main components include silicon dioxide (SiO2) and boron oxide (B2O3). The coefficient of thermal expansion of high borosilicate glass is (3.3 ± 0.1) × 10 ^ -6/K, which makes it less prone to fracture under temperature changes. ‌ The production process of high borosilicate glass includes steps such as preparation, melting, forming, annealing, and post-processing. Due to its excellent fire resistance and physical strength, high borosilicate glass is used in industries such as solar energy, chemical, pharmaceutical packaging, electric light sources, and craft jewelry. In addition, it also has applications in laboratories, such as manufacturing high durability beakers and test tubes. The unique properties of high borosilicate glass make it excellent in various applications. Its low thermal expansion coefficient reduces the impact of temperature gradient stress and enhances its fracture resistance. This type of glass also has high heat resistance and can withstand high temperature environments, making it suitable for special applications such as handling high-level radioactive nuclear waste. Due to its good chemical stability, high borosilicate glass also has applications in the chemical industry.

    When processing quartz glass, the following points should be noted: 1、 Understanding of Material Characteristics Quartz glass is a highly pure glass material with high hardness, strong corrosion resistance, and good high temperature resistance. However, its material properties also make processing difficult. 2、 Preparation before processing Cleaning: Clean the surface of quartz glass to ensure it is clean and dust-free. Design: Based on processing requirements, design and develop processing plans. Tool preparation: Select appropriate processing tools and materials. 3、 Precautions during processing Temperature control: Due to the high thermal expansion coefficient of quartz glass, it is necessary to control the processing temperature to avoid adverse effects caused by temperature changes in quartz glass. Process selection: Choose the appropriate processing technology according to the needs, such as cold processing technology (cutting, grinding, polishing) and hot processing technology (lamp processing, glass lathe processing, etc.). Handle with care: Quartz glass tubes are fragile and should be handled with care during processing to avoid damage. Temperature control: Master the usage temperature of various quartz glasses and ensure that it does not exceed this temperature during use to prevent crystallization or softening deformation. 4、 Special processing methods In some special cases, special processing methods such as laser or water jet cutting, chemical mechanical grinding, etc. may be required to increase processing efficiency and product quality.  

There are many types of glass, among which optical glass is one of them, which can change the direction of light propagation. It is used for lenses, prisms, etc. in optical instruments. Optical glass must meet the imaging requirements of light, and it does not require higher quality than ordinary glass. Qualified optical glass needs to meet the following requirements. Firstly, the optical constants of optical glass and the same batch of glass must be consistent. The first type of optical glass has a specified standard refractive index value for different wavelengths of light, which serves as the basis for optical designers to design optical systems. So the optical constants of the optical glass produced by the factory must be within a certain allowable deviation range of these values, otherwise it will cause the actual imaging quality to deviate from the expected results during design and affect the quality of the optical instrument. At the same time, due to the fact that instruments of the same batch are often made of the same batch of optical glass, in order to facilitate unified calibration of the instruments, the allowable deviation of the refractive index of the same batch of glass should be more stringent than their deviation from the standard value. Secondly, it requires a high degree of transparency, and the brightness of the optical system imaging is proportional to the transparency of the glass. The transparency of optical glass to a certain wavelength of light is represented by the light absorption coefficient K λ. After passing through a series of prisms and lenses, some of the energy of light is lost at the interface reflection of optical components, while the other part is absorbed by the medium (glass) itself. The former increases with the increase of glass refractive index, and this value is very large for high refractive index glasses, such as heavy flint glass, where the surface light reflection loss is about 6%.   

There are many types of optical glass, and filter is one of them, which can change the direction of light propagation. Filter is an optical device used to select the desired radiation band. As an optical device, it is a part of the development of the optical industry, and there are requirements for the surface smoothness, transmittance, reflectivity, accuracy of product parameters, and cut-off depth of the filter. Filters are used in lenses, prisms, and other optical instruments. Filters are generally divided into two categories: 1. Color filter, which is a flat glass or gelatin sheet of various colors with a transmission bandwidth of several hundred angstroms. 2. Thin film filters can be divided into two types: thin film absorption filters and thin film interference filters. The former is achieved by chemically etching a specific material substrate to position the absorption line precisely at the desired wavelength. Generally, it has a longer wavelength and is often used as an infrared filter. The latter is composed of metal dielectric metal films or fully dielectric films with a certain thickness of refractive index or low refractive index alternately formed by vacuum coating on a certain substrate. The main characteristic of a filter is that its size can be made large. Thin film filters, typically with long wavelengths, are commonly used as infrared filters. The latter is a low-level, multi-stage series solid Fabry Perot interferometer formed by alternately forming metal dielectric metal films or all dielectric films with a certain thickness of refractive index or low refractive index on a certain substrate using vacuum coating method. The selection of material, thickness, and series connection method for the membrane layer is determined by the required center wavelength and transmission bandwidth λ. Where are the applications of filters in our daily lives generally reflected? 1. Applied to the photography industry Photographers always use filter technology to highlight a certain person or scenery during filming, making the landscape presented to the audience clear at a glance. 2. Applied to testing instruments and other equipment Filters can also project and reflect incoming light in a certain proportion. So that these detection instruments can play different roles in various aspects. Some instruments require strong light, while others require weak light, which requires different filters to allow them to continue operating.

The stripes produced by ordinary glass are mainly due to uneven mixing of materials; Corrosion of refractory materials (mainly introduced by Al); Generated by agitation during the manufacturing of glass products. So optical glass needs to start from these aspects, as well as the high requirements for the particle size and weighing of raw materials. Melting furnaces use ceramics or platinum as refractory materials. Generally, only casting method, rolling method, breaking cylinder method, and liquid method are used for molding, which reduces the agitation of glass during molding. In addition, the structure of the melting furnace is different from that of a daily glass melting furnace. It is divided into a melting pool (feeding), a regulating pool (regulating the melting atmosphere), a refining pool (clarification), and a homogenization pool (stirring). The daily output of a large furnace is generally only 5 tons.

1. Heat reflective glass Heat reflective glass is coated with a metal film and some interference layers on the surface, allowing the glass product to reflect and achieve shading, while also having rich colors. Heat reflective glass has strong reflection of both visible light and long waves, and its function is to restrict the entry of the sun into the room. Disadvantages: The insulation properties of heat reflective glass are almost the same as transparent glass, so it is not suitable for cold areas with large temperature differences indoors; But in areas with strong sunlight. Reflective glass not only reflects the sun, but also limits the entry of visible light, which can have adverse effects on indoor lighting. In addition, high reflectivity can lead to light pollution, while low reflectivity cannot achieve the desired level It is the use of vacuum deposition to form a layer of Low-E coating on the surface of glass. The function of Low-E coating is first to reflect far-infrared and the heat transfer coefficient of glass; Secondly, there is a selective shading coefficient in reflecting the sun; Meanwhile, compared to heat reflective glass, glass does not impose too many restrictions on the penetration of visible light. Disadvantage: Due to the poor strength of the membrane layer, it is generally made into insulating glass and not used separately.

The development of optical glass and the development of optical instruments are inseparable. The new reform of optical systems often puts forward new requirements for optical glass, thus promoting the development of optical glass. Similarly, the successful trial production of new varieties of glass often leads to the development of optical instruments. The optical materials that have long been used by people to make optics are natural crystals. It is said that ancient Asia used crystals as lenses, while in ancient China, natural tourmaline (tea mirror) and citrine were used. Archaeologists have proven that glass could already be made in Egypt and during our Warring States period. But glass as glasses and mirrors still began in Venice. Subsequently, due to the development needs of astronomers and navigation, Galileo, Newton, Descartes, and others also made telescopes and microscopes out of glass. Since the 16th century, glass has become the main material for manufacturing optical components. In the 17th century, chromatic aberration in optical systems became a problem for optical instruments. At this time, due to the improvement of glass composition, Herr obtained an achromatic lens in 1729, and optical glass was divided into two categories: crown glass and flint glass.