Determination of refractive index of silica glass for infrared wavelengths by IR spectroscopy, J. Non-Cryst. This equation is valid between 0.21 and 3.71 µm and at 20 °C.
Additionally fused quartz/fused silica have a low thermal expansion coefficient and are resistant to scratches, water, and acids. 55, 1205-1208 (1965) 2) C. Z. Tan. Its refractive index varies from 1.55 to 1.40 (for its transparent range: 160nm to 3000nm). Please try again or Soc. Refractive index at 20°C and 1 bar The given values are interpolated from measured values. More accurate data available upon request. Interspecimen comparison of the refractive index of fused silica, J. Opt. The lower Fused quartz is also the material used for modern glass instruments such as the Fused silica as an industrial raw material is used to make various refractory shapes such as crucibles, trays, shrouds, and rollers for many high-temperature thermal processes including Owing to its low mechanical damping at ordinary temperatures, it is used for Quartz glassware is occasionally used in chemistry laboratories when standard The extremely low coefficient of thermal expansion, about 5.5 ⋅ 10"Infrared grade" fused quartz (tradenames "Infrasil", "Vitreosil IR", and others), which is electrically fused, has a greater presence of metallic impurities, limiting its UV transmittance wavelength to around 250 nm, but a much lower water content, leading to excellent infrared transmission up to 3.6 μm wavelength. Solids 223, 158-163 (1998) The water content (and therefore infrared transmission of fused quartz and fused silica) is determined by the manufacturing process. All grades of transparent fused quartz/fused silica have nearly identical physical properties. Flame-fused material always has a higher water content due to the combination of the hydrocarbons and oxygen fuelling the furnace, forming Most of the applications of fused silica exploit its wide transparency range, which extends from the UV to the near IR. Fused silica is the key starting material for Because of its strength and high melting point (compared to ordinary Because of its strength, fused silica was used in deep diving vessels such as the The combination of strength, thermal stability, and UV transparency makes it an excellent substrate for projection masks for Its UV transparency also finds uses in the semiconductor industry; an Due to the thermal stability and composition, it is used in semiconductor fabrication furnaces. The most dominant impurities are Melting is effected at approximately 1650 °C (3000 °F) using either an electrically heated furnace (electrically fused) or a gas/oxygen-fuelled furnace (flame-fused). Fused quartz is a man-made material manufactured from the same starting material, SiO 2, which is then heated, melted and after various processes to ensure its purity, is quenched to the amorphous state and formed into large blocks. References. This vacuum speed of light, c, is what the statements from relativity describe.Whenever light is in a vacuum, its speed has that exact value, no matter who measures it. References. Normal varieties of fused quartz contain water which gives it strong absorption bands in the infrared, though there are water-free varieties commercially available. Interspecimen comparison of the refractive index of fused silica, J. Opt. Soc. Fused silica, 20 °C. Am. In contrast to other optical glasses, quartz glass shows very little difference in refractive index from melt to melt. To request the proprietary encrypted file please enter your FilmetricsYour serial number could not be found.

Being a crystal, quartz has modest birefringent properties. Its validity was confirmed for wavelengths up to 6.7 µ… Fused quartz has nearly ideal properties for fabricating Fused quartz can be metallised and etched for use as a substrate for high-precision microwave circuits, the thermal stability making it a good choice for narrowband filters and similar demanding applications. This makes an isotropic optical material with a homogenous refractive index distribution necessary. Solids 223, 158-163 (1998) Heraeus Quarzglas has a unique process to provide real 3D materials with outstanding optical properties. Fused silica can be made from almost any Fused quartz is normally transparent. 1) I. H. Malitson. Its chemical formula is SiO2 and its transparent crystals have a moderate refractive index. Because fused silica is optically stable and consistent, many use it as a reference or standard for spectroscopic measurements. 55, 1205-1208 (1965) 2) C. Z. Tan. ... HOQ® 310 (natural fused quartz, OH ; 30ppm) Unusual and special optics Customer tailored optical components . “Fused quartz” and “fused silica” are medium refractive-index glasses containing predominately SiO2 in the amorphous (non-crystalline) form. The details of its refractive index temperature dependence are also well studied. Its raw crystal growth typically consists of a 6-sided prism ending in a 6-sided pyramid. properties of natural quartz can vary. The word quartz usually refers to the natural crystal or mineral as opposed to the phrase “fused quartz” which refers to the glass that is created out of a manufacturing process which involves heating quartz crystals to temperatures of around 2000 degrees Celsius (which has lower refractive index). © Copyright 2020 KLA Corporation. 1) I. H. Malitson. Quartz contains only silicon and oxygen, although commercial quartz glass often contains impurities. Quartz is a silicate and one of the most abundant minerals found in the Earth’s crust. Fused quartz has better ultraviolet transmission than most other common glasses (such as borosilicate glasses that have somewhat higher refractive indices), making it an ideal candidate for applications in the sub-400nm spectral region. The word quartz usually refers to the natural crystal or mineral as opposed to the phrase “fused quartz” which refers to the glass that is created out of a manufacturing process which involves heating quartz crystals to temperatures of around 2000 degrees Celsius (which has lower refractive index).