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Material Mechanism: Instead of surface coating, it relies on intrinsic light absorption by colorant ions inside the glass to filter stray light. Its performance is not affected by the incident angle of light, and no wavelength shift occurs when applied to wide-angle and outdoor equipment. Spectral Filtering Logic (Main Models: CB535/CB550/CB565/CB580): Cut-off & Blocking Range: 200~530/550/565/580 nm (ultraviolet, blue, cyan and light green light are fully absorbed); High Transmittance Band: Orange, red and near-infrared light with wavelengths longer than the cut-off wavelength (550~2500 nm) can pass through smoothly. Model Classification: The number after CB represents the cut-off wavelength. For example, CB565 takes 565 nm as the boundary, and all short-wave light below 565 nm is completely blocked.

Cut-off orange glass (industry code: CB series, CB stands for long-pass cut-off glass) is a bulk-absorption long-pass colored optical glass. It appears orange-yellow/amber and is one of the most widely used substrates for optical filters. Cut-off feature: It possesses the spectral characteristic of blocking short wavelengths while transmitting long wavelengths. There is a fixed cut-off wavelength (λtj), defined as the wavelength at 50% transmittance under standard glass thickness. Light with wavelengths shorter than this value is absorbed and blocked by the glass, while light with longer wavelengths achieves high transmittance. Orange hue: Colorant ions such as iron, cerium and rare earth oxides are added during glass melting. The glass inherently absorbs ultraviolet, violet, blue and short-wave green light, and only transmits yellow, orange, red and near-infrared light, showing an orange appearance to the naked eye, hence the name orange cut-off glass.

1、 Field of Optical Instruments and Spectral Analysis Spectral analysis filter: As a UV cut-off filter, it can be used in conjunction with a spectrophotometer and optical detector to block stray UV light interference and ensure visible light testing accuracy. Common models include the ZJB/WB series, and different specifications can accurately correspond to different cut-off wavelengths (such as WB220 for 220nm cut-off and WB380 for 380nm cut-off). Optical device protection: used as a protective film for optical lenses, camera lenses, and detection instruments, blocking ultraviolet rays to prevent aging of photosensitive components, and improving the imaging stability and service life of instruments. 2、 Civil protection and construction field UV resistant glass products: Made with PVB lamination technology, it can be used for civil UV resistant glass, such as car windshields, building doors and windows, and glass curtain walls. It can block more than 99% of harmful UV rays, reduce the risk of cataracts and skin cancer, while not affecting visible light transmittance. Home protection: The production of sunlight room and french window glass can reduce the ultraviolet radiation on furniture, curtains and leather goods, avoid fading and aging of fabrics and home, and extend the service life. 3、 Protection of cultural relics and collections Applied to precious cultural relics display cabinets in museums, it belongs to fully cut off UV resistant glass: Require a UV transmittance of less than 1% to completely block UV damage to photosensitive cultural relics such as paper, fabrics, oil paintings, lacquerware, etc., avoiding fading, aging, and brittleness of cultural relics; Simultaneously maintaining a high transmittance of over 91% without affecting the viewing effect. 4、 In the field of agricultural production Selective Transparent Glass Applied to Glass Greenhouses: It can block excessive ultraviolet radiation harmful to plants, retain visible light required for photosynthesis, reduce temperature accumulation in greenhouses, reduce pests and diseases, and improve the planting quality of high-end flowers and seedlings.

As shown in the figure above, this is a single-layer filter glass with a coating on only one side. Let’s assume that the top surface (green in the diagram) is the coated side. Now, observe the red line in the diagram from the perspective shown above. If you cannot see the red line, then the top surface is the coated side. If you can see the red line, you can confirm that the top surface is not the coated side. In that case, flip the bottom surface to the top and repeat the observation method to identify the coated side. Subei Optics specializes in Optical Colored Filter Glass,Coating Filter Glass,and Transparent Glass Windiow. Distinguishing the coated side helps us position the filter correctly during use. Different orientations can produce varying results in specific environments. For certain types of lenses, such as mirrors, the coated side facing outward results in external reflection, while the coated side facing inward results in internal reflection. In these cases, distinguishing the coated side is particularly important.

An optical prism is a transparent object formed by two intersecting but non-parallel planes, primarily used for splitting light or causing light beams to disperse. So, what are the applications of prisms? I. Optical Instruments Spectroscopic Instruments: In spectroscopic instruments, optical prisms (particularly dispersing prisms, such as equilateral prisms) are used to decompose composite light into a spectrum. This is based on the property that an optical prism has different refractive indices for light of different wavelengths, causing light of different wavelengths to disperse at different angles after passing through the prism, thereby forming a spectrum. This technology is widely used in scientific research and industrial production, such as in materials analysis and environmental monitoring. Subei Optics specializes in Optical Colored Filter Glass,Coating Filter Glass,and Transparent Glass Windiow. II. Digital Devices III. Science and Technology IV. Medical Instruments V. Other Applications

Surface Cleaning Substrates must undergo ultrasonic cleaning (deionized water + solvent) to remove oil and particles, followed by plasma cleaning to activate the surface and enhance coating adhesion. If mold-preventive powder or corrosion layers remain on the substrate, they must be pre-wiped with calcium carbonate powder. Subei Optics specializes in Optical Colored Filter Glass,Coating Filter Glass,and Transparent Glass Windiow. Baking and Degassing Prior to coating, the substrate must be baked in a vacuum chamber at 300°C or higher for ≥20 minutes to volatilize adsorbed gases and prevent bubbling or peeling of the coating after deposition.

I. Substrate Preparation Objective: Provide a clean, flat surface with high adhesion for subsequent coating processes. Steps: Substrate selection, surface cleaning, activation, and treatment. Ensure the substrate material is suitable for coating, remove surface contaminants, and enhance adhesion between the coating and substrate. II. Coating Process Establishing Vacuum Conditions: Prior to coating, create a high-vacuum environment to minimize gas molecule interference and enhance coating quality. Coating Technology Selection: Evaporation Coating: Heats coating materials to vaporize them, then deposits the vapor onto the filter substrate within the vacuum environment. Evaporation techniques include thermal evaporation and electron beam evaporation. Electron beam evaporation enables precise control over evaporation rate and film thickness, making it suitable for coating high-melting-point materials. Sputtering Coating: High-energy particles bombard a target material, causing atoms to sputter off and deposit onto the substrate. Sputtering produces films with excellent uniformity and strong adhesion, suitable for coating various materials. Ion-assisted coating: An ion beam is introduced during deposition to bombard and modify the growing film, enhancing its structure and properties—such as improving film density and hardness. Film Material Selection and Thickness Control: Select appropriate coating materials based on the optical performance requirements of the filter. Control film thickness by precisely regulating coating time and deposition rate. Subei Optics specializes in Optical Colored Filter Glass,Coating Filter Glass,and Transparent Glass Windiow. III. Post-Processing Steps Objective: Further optimize film stability and performance to ensure the finished product meets design specifications. Steps: May include thermal treatment, film performance optimization, and final cleaning to enhance durability and optical characteristics.

Coating Filter Glass is a specially treated optical filter primarily used to reduce surface reflections and enhance transmitted light intensity, thereby improving optical system performance. Typically, one or more transparent dielectric films—known as anti-reflective coatings—are deposited onto the filter surface. Basic Principle of Coated Filters The principle of anti-reflective coatings is based on the phenomenon of light interference. When light strikes an anti-reflective coating, if the film thickness equals one-quarter of the incident light wavelength, the reflected light undergoes interference on both sides of the film. This interference causes the reflected light to cancel each other out, thereby reducing the intensity of reflected light and increasing the intensity of transmitted light. This treatment reduces surface reflections on optical components, improves light transmittance, and consequently enhances the performance of optical systems. Applications of Coated Filter Glass Coated filter glass is utilized in various optical systems, particularly where high transmittance and low reflectance are required. Examples include: ‌Telescopes: Reduces ghosting in binoculars, enhancing contrast. ‌Eyeglass Lenses: Minimizes lens reflections, improving visual comfort. Laser systems: Hard-coated filters are widely used in laser systems due to their high laser damage threshold. TFT-LCD backlight modules: Color filters are essential components in TFT-LCD backlight modules. Classification of Coated Filter Glass Coated filter glass can be categorized based on spectral band, spectral characteristics, coating materials, etc.: Spectral Band: Ultraviolet filters, visible filters, infrared filters. Spectral Characteristics: Bandpass filters, bandstop filters, spectroscopic filters, neutral density filters, reflective filters. Coating Material: Soft-coated filters and hard-coated filters.

Optical Colored Filter Glass is a glass material used to manufacture lenses, prisms, mirrors, windows, and other components for optical instruments or mechanical systems. It includes colorless optical glass (commonly referred to as optical glass), Optical Colored filter glass, radiation-resistant optical glass, radiation-shielding glass, and optical quartz glass.Subei Optics specializes in Optical Colored Filter Glass,Coating Filter Glass,and Transparent Glass Windiow. Dust-Free Environment High-precision coating (e.g., for optical or semiconductor applications) is recommended to be performed in a Class 1000 cleanroom to minimize dust contamination risks and reduce the probability of pinholes or delamination caused by dust adhesion. Thorough cleaning of the vacuum chamber, substrate holders, and transfer equipment is required before and after coating to prevent contamination from residual impurities.     Temperature, Humidity, and Ventilation Temperature should be maintained at 22±2°C, with humidity ≤45%. Elevated temperatures accelerate film oxidation, while excessive humidity promotes moisture adsorption, leading to haze formation or reduced adhesion. The vacuum chamber must be equipped with a dry gas (e.g., nitrogen) purge system to prevent residual moisture during thawing.  

Coating Filter Glass Substrate Processing Specifications Surface Cleaning Substrates must undergo ultrasonic cleaning (deionized water + solvent) to remove oil and particles, followed by plasma cleaning to activate the surface and enhance coating adhesion. If mold-inhibiting powder or corrosion layers remain on the substrate, pre-wipe with calcium carbonate powder. Subei Optics specializes in Optical Colored filter glass,Coating Filter Glass,and Transparent Glass Windiow. Baking Degassing Prior to coating, substrates must be baked in a vacuum chamber at ≥300°C for ≥20 minutes to volatilize adsorbed gases, preventing film bubbling or delamination after coating.

Optical glass is a type of glass that can alter the direction of light propagation and modify the relative spectral distribution of ultraviolet, visible, or infrared light. It is an inorganic glass material that transmits light through refraction, reflection, or transmission, or alters light intensity or spectral distribution through absorption. It possesses stable optical properties and optical homogeneity. Optical Colored Filter Glass is a glass material used to manufacture lenses, prisms, mirrors, windows, and other components for optical instruments or mechanical systems. It includes colorless optical glass (commonly referred to as optical glass), Optical Colored Filter Glass, radiation-resistant optical glass, radiation-shielding glass, and optical quartz glass. Subei Optics specializes in Optical Colored Filter Glass,Coating Filter Glass,and Transparent Glass Windiow.

Keeping Optical Colored Filter Glass clean will extend its lifespan. Contamination can cause numerous issues with the lens, such as uneven distribution of laser power during reflection. This leads to higher temperatures at the lens base and lower temperatures at the edges, a phenomenon known optically as the lens effect.   Failure to follow lens cleaning requirements and precautions, or improper handling, may introduce new contamination or even scratch the Optical Colored Filter Glass, causing unnecessary damage. Avoid direct contact between the lens surface and hard objects. When cleaning, first rinse with water (or water mixed with a small amount of dish soap), then use a dedicated lens cloth or high-quality cotton paper to absorb water droplets from the lens surface. Even if the lens shows no scratches, it should not be used indefinitely.   Ordinary Glass: Relatively lower transparency and poorer uniformity. May exhibit distortion when transmitting light, potentially causing data deviation and errors during image capture.Subei Optics specializes in Optical Colored Filter Glass,Coating Filter Glass,and Transparent Glass Windiow. Lenses are manufactured through high-temperature or UV-cured liquid monomer processes. Over extended use, environmental and temperature changes cause alterations in both the lens coating and the lens material itself. This leads to light scattering, reduced comfort, and prolonged wear may result in symptoms like dryness and eye strain. At this point, it is necessary to replace the Optical Colored Filter Glass.

There are significant differences between colored optical glass and ordinary glass, primarily manifested in the following aspects: I. Material Composition Optical Colored Filter Glass: Primarily made from borosilicate glass or quartz glass. These materials are specially designed for optical instrument manufacturing, requiring high raw material purity with harmful impurities controlled at low levels. Ordinary Glass: Manufactured from raw materials such as sand (primarily silica), limestone, and soda ash. Its composition is relatively simple, primarily used for building applications like windproofing and light transmission. II. Manufacturing Process Optical Colored Filter Glass: Production demands high precision and stringent quality control. The manufacturing process is complex, requiring advanced technical expertise and sophisticated equipment, along with precise temperature control and meticulous finishing techniques. Ordinary Glass: Processing is relatively straightforward, achievable through extrusion or molding after melting to form various shapes. III. Performance Characteristics Optical Colored Filter Glass: Exhibits high transparency, high hardness, stable mechanical properties, and optical performance—including high refractive index, low dispersion, and excellent imaging quality—while demonstrating favorable behavior toward ultraviolet and infrared light. Ordinary Glass: Relatively lower transparency and poorer uniformity. May exhibit distortion when transmitting light, potentially causing data deviation and errors during image capture. Subei Optics specializes in Optical Colored Filter Glass,Coating Filter Glass,and Transparent Glass Windiow. IV. Application Fields Optical Colored Filter Glass: Primarily used in manufacturing lenses, prisms, mirrors, windows, and other components for optical instruments or mechanical systems requiring stringent optical performance specifications. Ordinary Glass: Applied in buildings for wind protection and light transmission. Can also be processed into tinted glass, tempered glass, etc., for use across various industries.

Glass that can change the direction of light propagation and can alter the relative spectral distribution of ultraviolet, visible or infrared light is called Optical Colored Filter Glass. It is an inorganic glassy material that transmits light through refraction, reflection, or transmission, or changes the intensity or spectral distribution of light by absorbing. It has stable optical properties and optical uniformity.  Optical Colored Filter Glass is a type of glass material used for manufacturing lenses, prisms, reflectors, windows, etc. in optical instruments or mechanical systems. It includes colorless optical glass (often referred to as optical glass), colored optical glass, radiation-resistant optical glass, radiation-proof glass, and optical quartz glass, etc.    Subei Optics specializes in Optical Colored Filter Glass,Coating Filter Glass,and Transparent Glass Windiow. Optical Colored Filter Glass possesses transparency, uniformity in terms of both chemistry and physics (structure and properties), and optical constants. It can be classified into series of silicate, borate, phosphate, fluoride and chalcogenide compounds. There are numerous varieties, and they are mainly categorized based on their positions on the refractive index (nd) - Abbe value (vd) graph. Traditionally, glasses with nd > 1.60 and vd > 50 and nd > 55 are classified as crown (k) glass, while the rest are classified as flint (f) glass. Crown glass is generally used as convex lenses, and flint glass as concave lenses. Generally, crown glass belongs to the alkali borosilicate system, light crown glass belongs to the aluminosilicate system, heavy crown glass and barium flint glass belong to the alkali-free borosilicate system, and most flint glass belongs to the lead potassium silicate system. With the continuous expansion of the application fields of optical glass, its varieties are constantly increasing, and its composition almost includes all elements in the periodic table.

The main reasons why optical glass has no streaks after grinding include factors such as high purity of raw materials, furnace structure and forming methods. ‌ Firstly, the high purity of ‌ raw materials ‌ is one of the reasons why optical glass has no streaks after grinding. The raw materials for optical glass are required to have a purity of over 99% and a low impurity content, usually less than a few parts per 100,000. This high-purity raw material can reduce impurities and unevenness generated during the melting process, thereby avoiding streaks ‌ after grinding.Secondly, the structure of the ‌ furnace and the forming method ‌ also have an impact on the formation of fringes in Optical Colored Filter Glass. The furnaces for Optical Colored Filter Glass usually use ceramics or platinum as refractory materials and are divided into melting tanks, regulating tanks, refining tanks and homogenizing tanks. This structure can effectively prevent the stirring of the glass during the forming process, thereby reducing the formation of streaks ‌. In addition, the forming methods also include pouring, rolling, and breaking the cylinder, etc. These methods can effectively avoid the streaks ‌ caused by stirring. Finally, the controlling factors in the ‌ melting process. During the melting process, strictly controlling the process parameters and the weighing of the raw material section to ensure the uniform mixing and melting of the compound can reduce the occurrence of streaks. Once problems arise, analyze, rectify and correct them in a timely manner to prevent them from escalating ‌.   Haian Subei Optical Glass Factory specializes in the precision manufacturing and processing of a wide range of optical components. Their capabilities include producing Optical Colored Filter Glass,  They also work with materials like Transparent Glass Windows and Acrylic/PMMA Sheets, and fabricate essential products such as Optical Mirrors and Various Camera Filters. To sum up, the main reasons for the absence of streaks on optical glass after grinding include the high purity of raw materials, a reasonable furnace structure and forming method, as well as strict control of the melting process.

Optical glass is a kind of inorganic glassy material that can change the direction of light propagation and alter the relative spectral distribution of ultraviolet, visible or infrared light. In a narrow sense, optical glass refers to colorless optical glass; in a broad sense, it also includes colored optical glass, laser glass, quartz optical glass, radiation-resistant glass, ultraviolet and infrared optical glass, fiber optical glass, acousto-optic glass, magneto-optic glass and photochromic glass. Optical glass can be used to make lenses, prisms, mirrors and windows in optical instruments. Components made of optical glass are key elements in optical instruments. It is a kind of inorganic glassy material that transmits light through refraction, reflection or transmission, or changes the intensity or spectral distribution of light through absorption. It has stable optical properties and high optical uniformity. Haian Subei Optical Glass Factory specializes in the precision manufacturing and processing of a wide range of optical components. Their capabilities include producing Optical Colored Filter Glass,  They also work with materials like Transparent Glass Windows and Acrylic/PMMA Sheets, and fabricate essential products such as Optical Mirrors and Various Camera Filters.​

The primary reasons for the absence of striations in Optical Colored Filter Glass after polishing include high raw material purity, furnace structure, and forming methods. First, the high purity of raw materials is one reason why optical glass exhibits no striations after polishing. Optical glass requires raw materials with a purity exceeding 99%, featuring low impurity content typically below a few parts per million. This high-purity material minimizes impurities and inhomogeneities generated during melting, thereby preventing striations after polishing. Second, furnace structure and forming methods also influence striation formation in optical glass. Optical glass furnaces typically employ ceramic or platinum refractories and are divided into melting, regulating, refining, and homogenizing chambers. This structure effectively minimizes agitation during forming, thereby reducing striations. Additionally, forming methods such as casting, rolling, and tank-breaking techniques help prevent striations caused by agitation. Subei Optics specializes in Optical Colored Filter Glass,Coating Filter Glass,and Transparent Glass Windiow. Finally, control factors during the melting process. Strictly regulating process parameters and weighing at the raw material stage ensures uniform mixing and melting of the batch, thereby reducing striations. Should issues arise, prompt analysis, rectification, and error correction prevent problem escalation. In summary, the absence of streaks in polished optical glass primarily stems from three factors: high-purity raw materials, optimized furnace design and forming techniques, and stringent control over the melting process.    

Subei Optics specializes in Optical Colored Filter Glass,Coating Filter Glass,and Transparent Glass Windiow. Optical glass refers to glass that can alter the direction of light propagation and modify the relative spectral distribution of ultraviolet, visible, or infrared light. In a narrow sense, optical glass denotes colorless optical glass; it is used to manufacture lenses, prisms, mirrors, and windows for optical instruments. The distinction between optical glass and other types of glass lies in its role as a component within optical systems, where it must meet specific requirements for optical imaging. Consequently, the quality assessment of optical glass involves certain specialized and stringent criteria. I. Specific Optical Constants and Consistency of Optical Constants Within the Same BatchEach type of optical glass possesses defined standard refractive index values for light at different wavelengths, serving as the foundation for optical designers when planning optical systems. Therefore, the optical constants of factory-produced optical glass must fall within specified tolerance ranges for these values. Otherwise, the actual imaging quality will deviate from the design expectations, compromising the performance of optical instruments. II. High TransparencyThe brightness of an optical system's image is directly proportional to the transparency of the glass. The transparency of optical glass to light of a specific wavelength is expressed by the optical absorption coefficient Kλ. As light passes through a series of prisms and lenses, part of its energy is lost due to reflection at the interfaces of optical components, while another part is absorbed by the medium (glass) itself. Therefore, for optical systems containing multiple thin lenses, the primary method to enhance transmittance lies in reducing reflection losses at the lens surfaces, such as by applying anti-reflective coating layers.