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Band pass Filter Glass Belonging to a type of optical filter glass, optical characteristics: Allow only a certain continuous wavelength of light to pass through; Light shorter than this wavelength and longer than this wavelength is absorbed/blocked. Simple understanding: Set up a transparent "channel" where light passes through and is intercepted outside the channel. 1) Absorption type bandpass colored optical glass (body glass, uncoated) Does not shift wavelength with incident angle of light (oblique illumination, unchanged transmission band) Can be cut, edged, punched, and used in combination with high borosilicate substrates Stable structure, no risk of membrane detachment, high temperature resistance 2) Interference type coated bandpass filter (thin film coated type) The bandwidth can be made very narrow and the blocking ability is extremely strong (deep cutoff)

Assuming glass thickness=T 1. Corner and slotting Prohibit sharp inner right angles! The minimum rounded corner R for all inner corners is ≥ 1.5 × T; sharp corners generate stress concentration and are prone to explosion due to alternating hot and cold temperatures; Long narrow groove: groove width ≥ 1.2T, avoid narrow thin plates as much as possible. 2. Hole opening rules (customized tipping points in large quantities) Minimum aperture: ≥ 1.0 × T; recommended ≥ 1.5T to reduce edge breakage and cracking; The distance from the hole to the outer edge of the glass is ≥ 2 × T; The net distance between holes is ≥ 2 × T; After the completion of through-hole/countersunk hole processing, the inner wall of the hole must be chamfered/polished to remove micro cracks; Do not drill holes tightly against the edges. 3. Thickness selection reference Optical protective film, display screen cover: 1.0-2.0mm Conventional instrument window, water cup container: 2-5 mm High pressure, industrial observation window, pressure bearing condition: 6-15mm ⚠️ The same piece of glass should have a uniform wall thickness as much as possible, and areas with sudden thickness changes are prone to stress concentration. 4. Reasonable tolerance setting (do not blindly pursue ultra-high precision) Conventional waterjet/CNC cutting: external tolerance ± 0.2~± 0.5mm High precision laser processing: ± 0.05~± 0.1mm  

July 9, 2026 — Selective absorption optical glass, a functional optical material that precisely absorbs specific spectral bands while retaining required light transmission, has become increasingly popular in global high-end optoelectronic markets this year. Unlike conventional cut-off glass, it features flexible spectral matching and stable light absorption performance. It is widely applied in industrial machine vision, medical biochemical detection, multispectral imaging and laser precision processing systems. By filtering stray and interfering light wavelengths, it effectively improves detection accuracy and imaging stability for smart optical devices. Driven by the upgrading of global intelligent manufacturing and medical optical equipment, overseas market demand for customized selective absorption optical glass continues to grow. Industry trends show that high-purity, low-dispersion and multi-band absorption glass will dominate the premium market, bringing steady export growth opportunities for professional optical glass manufacturers in the second half of 2026.

July 9, 2026 — Cut-off optical glass, featuring precise spectral filtering that selectively blocks or transmits specific light wavelengths, has witnessed booming global application demands this year, becoming a core functional material for high-precision optical systems. Widely adopted in consumer imaging, automotive ADAS, security monitoring and biomedical devices, the specialized optical glass effectively eliminates stray light interference to boost imaging accuracy. Near-infrared cut-off glass serves smartphone and vehicle cameras for true-color imaging, while ultraviolet cut-off variants support medical detection and fluorescent identification equipment. Driven by the global upgrade of intelligent imaging and optoelectronic precision manufacturing, cross-border trade of high-stability customized cut-off optical glass keeps rising. Industry insiders point out that product differentiation and high spectral stability will be the core competitive points, fueling steady export growth of premium optical glass products in the second half of 2026.  

During the melting of silicate / borosilicate glass, semiconductor sulfides (CdS/CdSe), transition metal ions and rare earth ions are doped into the glass. Selective light absorption is realized via internal electron transitions of the material, and light filtering can be achieved without surface coating:   Short-wavelength light carries energy matching the ionic energy levels, which is absorbed by the glass and converted into heat;   Long-wavelength photons cannot excite electrons and pass directly through the glass;   Advantages: Its spectral performance will not shift with the incident angle of light, and it boasts better stability than coated optical filters.

Cut-off optical glass is one of the three major categories of colored optical glass (the other two are selective absorption glass and neutral density glass), and it belongs to bulk absorption filter materials. It features a steep spectral boundary (cutoff wavelength λtj): Wavelengths shorter than the cutoff wavelength: almost completely absorbed with transmittance close to 0 ("cut off"); Wavelengths longer than the cutoff wavelength: high light transmittance, allowing light to pass through smoothly. Standard definition of cutoff wavelength: it refers to the wavelength at which the transmittance reaches 50% of the maximum transmittance under a fixed thickness, serving as the core parameter of this type of glass.

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.