{"id":3192,"date":"2026-07-03T05:22:25","date_gmt":"2026-07-03T05:22:25","guid":{"rendered":"https:\/\/www.fuyao-quartz.com\/?p=3192"},"modified":"2026-07-03T05:32:29","modified_gmt":"2026-07-03T05:32:29","slug":"uv-fused-silica-transmission","status":"publish","type":"post","link":"https:\/\/www.fuyao-quartz.com\/hu\/uv-fused-silica-transmission\/","title":{"rendered":"UV Fused Silica Transmission: What Affects 185 nm, 254 nm and Deep-UV Performance?"},"content":{"rendered":"<p class=\"wp-block-paragraph\"><a href=\"https:\/\/www.fuyao-quartz.com\/hu\/products\/\">UV fused silica<\/a> is one of the most important optical materials for ultraviolet and deep-ultraviolet applications. It is widely used in UV lamps, lithography-related optics, semiconductor inspection systems, analytical instruments, sterilization equipment, laser systems, optical windows, lenses, prisms, cuvettes, and precision quartz components.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Compared with ordinary glass, UV-grade fused silica offers much higher ultraviolet transmission, lower impurity content, better thermal stability, and stronger resistance to radiation-related performance loss. However, not all fused silica materials perform the same in the ultraviolet range. Transmission at 185 nm, 254 nm, and other deep-UV wavelengths can be strongly affected by material purity, hydroxyl content, metallic impurities, thickness, surface quality, coatings, contamination, and operating environment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For engineers and buyers, understanding these factors is essential when selecting UV fused silica windows, tubes, plates, sleeves, lenses, or custom optical parts.<\/p>\n\n\n\n<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"576\" src=\"https:\/\/www.fuyao-quartz.com\/wp-content\/uploads\/2026\/07\/UV-Fused-Silica-Transmission-What-Affects-185-nm-254-nm-and-Deep-UV-Performance-1024x576.png\" alt=\"\" class=\"wp-image-3193\" srcset=\"https:\/\/www.fuyao-quartz.com\/wp-content\/uploads\/2026\/07\/UV-Fused-Silica-Transmission-What-Affects-185-nm-254-nm-and-Deep-UV-Performance-1024x576.png 1024w, https:\/\/www.fuyao-quartz.com\/wp-content\/uploads\/2026\/07\/UV-Fused-Silica-Transmission-What-Affects-185-nm-254-nm-and-Deep-UV-Performance-300x169.png 300w, https:\/\/www.fuyao-quartz.com\/wp-content\/uploads\/2026\/07\/UV-Fused-Silica-Transmission-What-Affects-185-nm-254-nm-and-Deep-UV-Performance-768x432.png 768w, https:\/\/www.fuyao-quartz.com\/wp-content\/uploads\/2026\/07\/UV-Fused-Silica-Transmission-What-Affects-185-nm-254-nm-and-Deep-UV-Performance-1536x864.png 1536w, https:\/\/www.fuyao-quartz.com\/wp-content\/uploads\/2026\/07\/UV-Fused-Silica-Transmission-What-Affects-185-nm-254-nm-and-Deep-UV-Performance-18x10.png 18w, https:\/\/www.fuyao-quartz.com\/wp-content\/uploads\/2026\/07\/UV-Fused-Silica-Transmission-What-Affects-185-nm-254-nm-and-Deep-UV-Performance-600x338.png 600w, https:\/\/www.fuyao-quartz.com\/wp-content\/uploads\/2026\/07\/UV-Fused-Silica-Transmission-What-Affects-185-nm-254-nm-and-Deep-UV-Performance.png 1672w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\">Why 185 nm and 254 nm Are Important<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Two of the most common ultraviolet wavelengths in industrial and laboratory applications are 185 nm and 254 nm. Both are commonly associated with low-pressure mercury lamp systems and UV-based processing equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The 254 nm wavelength is widely used for disinfection, sterilization, photochemical processing, water treatment, air purification, biological analysis, and UV detection. Many UV lamp sleeves and protective quartz tubes are designed to allow strong transmission at 254 nm while protecting the lamp and maintaining stable operation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The 185 nm wavelength is more demanding. It belongs to the deeper ultraviolet range and is often used in ozone generation, advanced oxidation, surface cleaning, photo-oxidation, and specialized UV processing. Since 185 nm radiation is absorbed more easily by many materials, the optical material must have extremely low UV absorption and very high purity.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is why UV fused silica is usually preferred over standard borosilicate glass or soda-lime glass for applications involving 185 nm and 254 nm radiation.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Material Purity and Metallic Impurities<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Material purity is one of the most important factors affecting UV transmission. In the deep-UV range, even trace impurities can absorb light and reduce transmission. Metallic contaminants such as iron, titanium, aluminum, sodium, potassium, and transition metals may create absorption bands or increase scattering loss.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Synthetic fused silica generally provides better UV performance than fused quartz made from natural crystalline quartz. This is because synthetic fused silica is produced from high-purity chemical precursors, allowing lower metallic impurity levels and better optical consistency.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For deep-UV applications, the difference between \u201cclear quartz,\u201d \u201cfused quartz,\u201d and \u201cUV-grade fused silica\u201d is important. A material may look transparent to the human eye but still perform poorly at 185 nm or 254 nm. Visible transparency does not guarantee deep-UV transmission.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When specifying optical parts for UV systems, buyers should confirm the material grade and request transmission data if the application is sensitive to UV output.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Hydroxyl Content and UV\/IR Grade Differences<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Hydroxyl content, often referred to as OH content, also affects optical performance. UV-grade fused silica usually contains a relatively higher OH content, which helps improve transmission in the ultraviolet region and reduce certain UV absorption effects.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In contrast, IR-grade fused silica is typically produced with low OH content to improve infrared transmission. Low-OH materials may perform well in the near-infrared or mid-infrared range but may not be the best choice for deep-UV transmission.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This means the same fused silica material cannot be judged only by appearance or general purity. The correct grade must be selected according to the wavelength range. For 185 nm and 254 nm applications, UV-grade fused silica is usually more appropriate. For infrared optics, low-OH IR-grade fused silica may be preferred.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Thickness and Optical Path Length<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Even when the material itself has high UV transmission, part thickness can significantly affect actual performance. The longer the optical path length, the more UV energy may be absorbed inside the material.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For example, a thin UV fused silica window may show excellent transmission at 254 nm, while a much thicker plate made from the same material may transmit less light. This effect becomes even more important at 185 nm because deep-UV wavelengths are more sensitive to absorption.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When designing UV optical parts, it is important to reduce unnecessary thickness while still meeting mechanical strength, sealing, pressure, and thermal requirements. For lamp sleeves, optical windows, and flow-cell components, engineers must balance UV transmission with durability and structural safety.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Surface Finish and Polishing Quality<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Surface quality also influences UV performance. Scratches, pits, chips, subsurface damage, grinding marks, and polishing defects can increase scattering and reduce usable optical output. In high-precision UV systems, poor surface finish may also cause uneven illumination, signal loss, or localized contamination.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For UV fused silica windows and plates, polished surfaces are usually required. Double-side polishing may be needed when light must pass through both surfaces with minimal distortion. For lenses and prisms, surface figure, scratch-dig quality, roughness, and wedge tolerance may become critical.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In deep-UV applications, surface contamination can be just as problematic as surface roughness. Organic residues, fingerprints, cleaning agents, dust, or packaging contamination may absorb UV light or degrade during exposure, forming deposits on the optical surface. Proper cleaning and handling are therefore essential.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Coatings and Reflection Loss<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Even high-quality UV fused silica loses some light through reflection at each air-glass interface. In many UV optical systems, anti-reflective coatings are used to improve transmission at target wavelengths such as 254 nm or specific laser wavelengths.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, coatings for deep-UV applications must be selected carefully. Not every optical coating can withstand 185 nm or 254 nm radiation. Some coatings may degrade, absorb UV energy, change transmission over time, or fail under high-power exposure.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For simple UV lamp sleeves or protective tubes, uncoated fused silica is often used. For precision optical systems, AR-coated UV fused silica windows or lenses may be required. The coating design should match the operating wavelength, incident angle, power density, temperature, and environmental conditions.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Solarization and Long-Term UV Exposure<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Solarization is a common concern in UV optical materials. It refers to the gradual formation of color centers or absorption defects after exposure to high-energy ultraviolet radiation. Solarization can reduce transmission over time, especially in high-intensity UV lamp systems or laser environments.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The resistance of fused silica to solarization depends on material grade, impurity content, manufacturing process, hydrogen content, radiation intensity, wavelength, and operating conditions. Some fused silica grades are specially designed to resist UV-induced transmission loss.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For systems requiring long service life, such as UV curing equipment, semiconductor inspection tools, water sterilization systems, and excimer laser optics, solarization resistance should be considered during material selection.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Thermal Stability and UV Lamp Operation<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">UV fused silica is not only valued for optical transmission but also for thermal stability. UV lamp sleeves, tubes, and windows may operate near heat sources or experience repeated heating and cooling cycles. Ordinary glass may deform, crack, or lose optical performance under these conditions.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Fused silica has a very low coefficient of thermal expansion, which helps reduce thermal stress. This makes it suitable for lamp sleeves, furnace windows, high-temperature optical ports, and UV systems with thermal cycling.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">However, thermal shock performance also depends on component geometry, wall thickness, edge condition, mounting design, and cooling rate. Sharp edges, poor polishing, or mechanical stress may increase the risk of cracking even when the base material is highly stable.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Contamination, Cleaning and Handling<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Deep-UV transmission is highly sensitive to contamination. A small amount of oil, dust, adhesive residue, or cleaning chemical can cause measurable absorption, especially at 185 nm. Under strong UV exposure, organic contamination may decompose and form haze or deposits on the optical surface.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For UV fused silica parts, clean handling is important. Gloves, clean packaging, dust-free storage, and proper cleaning procedures help maintain optical performance. In semiconductor or analytical applications, additional cleaning and particle control may be required.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For parts used in ozone generation or 185 nm systems, material cleanliness is especially important because reactive oxygen species can accelerate surface changes if contaminants are present.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">How to Specify UV Fused Silica Components<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">When ordering UV fused silica windows, tubes, sleeves, plates, or custom parts, the specification should include more than dimensions. Important parameters include wavelength range, target transmission, material grade, OH content, thickness, surface polishing, surface quality, flatness, roughness, edge finish, coating requirement, thermal condition, chemical exposure, and cleaning grade.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For 254 nm UV sterilization systems, the key concern is usually stable transmission, lamp protection, heat resistance, and long-term cleanliness. For 185 nm ozone-generating systems, material grade and deep-UV transmission become more critical. For laser optics, additional requirements such as homogeneity, birefringence, wavefront distortion, coating performance, and laser damage threshold may be needed.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Providing the working wavelength, operating temperature, UV intensity, drawing, size tolerance, and application environment can help manufacturers recommend the most suitable fused silica material and processing method.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Tipikus alkalmaz\u00e1sok<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">UV fused silica is used in many technical fields, including UV lamp sleeves, ozone generator tubes, germicidal lamp protection tubes, UV reactor windows, semiconductor inspection optics, photolithography-related optical components, analytical cuvettes, spectrometer windows, laser windows, microfluidic observation plates, optical sensors, vacuum viewports, and precision laboratory equipment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">In semiconductor and electronics manufacturing, UV fused silica is often selected for its combination of high purity, dimensional stability, UV transparency, and resistance to thermal stress. In water and air treatment systems, it is used to protect UV lamps while allowing efficient radiation output. In optical instruments, it provides stable transmission and low distortion across ultraviolet and visible wavelengths.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">K\u00f6vetkeztet\u00e9s<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">UV fused silica transmission at 185 nm, 254 nm, and other deep-UV wavelengths depends on multiple factors. Material purity, metallic impurities, OH content, thickness, surface finish, coatings, solarization resistance, contamination control, and operating environment all influence final optical performance.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For 254 nm applications, UV fused silica offers high transmission, thermal stability, and long service life. For 185 nm applications, material selection becomes more demanding because deep-UV absorption is more sensitive to impurities and optical path length. Choosing the right UV-grade fused silica material helps improve system efficiency, reduce transmission loss, and maintain stable performance over time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">When selecting UV fused silica components, buyers should not rely only on appearance or general glass type. The correct approach is to define the wavelength, application environment, surface quality, thickness, and long-term performance requirements. With the right specification, UV fused silica can provide a reliable optical solution for deep-UV lamps, semiconductor equipment, analytical instruments, and advanced photonic systems.<\/p>","protected":false},"excerpt":{"rendered":"<p>UV fused silica is one of the most important optical materials for ultraviolet and deep-ultraviolet applications. It is widely used in UV lamps, lithography-related optics, semiconductor inspection systems, analytical instruments, sterilization equipment, laser systems, optical windows, lenses, prisms, cuvettes, and precision quartz components. Compared with ordinary glass, UV-grade fused silica offers much higher ultraviolet transmission, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":3193,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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