CaF2 Crystals Used in Spectroscopic Windows

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CaF2 crystal

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Calcium Fluoride CaF2 crystals

CaF2 is a crystal with good transmission from 170 nm to 7800 nm. It is slightly soluble in water and susceptible to thermal shock. CaF2 is commonly used in IR components such as windows, lenses and prisms.

CaF2 Properties:

Calcium Fluoride is used for optical windows, lenses and prisms in transmision range 0.15-9mkm. Degradation due to to moisture in the atmosphere is minimal, and polished surfaces of the CaF2 windows may be expected to withstand several years exposure to normal atmospheric conditions.

Since they are nonaxial, CaF2 crystals do not require consideration of axial direction. Because of CaF2 low refractive index, Calcium Fluoride windows can be used without an anti-reflection coating.

Calcium Fluoride is attacked by atmospheric moisture at 600°C, where it begins to soften. The top use temperature is 800C, when moisture is not present. Irradiation of Calcium Fluoride windows causes some loss in UV transmission. CaF2 is sensitive to thermal shock.

Typical applications: VUV - UV - IR imaging systems, excimer laser windows, Spectroscopic windows and lenses. Alkor produces CaF2 windows and mirrors for European manufacturers of gas detectors and gas analyzers.

Maximum diameter of CaF2 windows by Jarvis - 220mm (8"). Jarvis manufactures vacuum UV grade CaF2 windows and lenses (193nm and 157nm) upon request.

Specifications:

1. Calcium fluoride crystal (Coating material)

Cut off wavelength 0.13~9μm

Transmissivity:90%(0.4~7μm)

Moh’s hardness: 4 Gpa

Young modulus:146.1Gpa

Density: 3.18g/cm3

Coefficient of linear expansion: 1.84 x 10-5/k

Application:

Calcium Fluoride is often used in spectroscopic windows and lenses due to its high transmission from 350nm to 7μm. Calcium Fluoride is also commonly found in cryogenically cooled thermal imaging systems. Its low absorption and high damage threshold makes it a popular choice for excimer laser optics. Calcium Fluoride's low refractive index allows it to be used without an antireflective coating. The Knoop hardness of Calcium Fluoride is 158.3.

Q:Pink and what is the difference between rare earth polishing powder: The position of rare earth elements in the periodic table of the element is very special. The 17 elements are in the first element of the transition element series in group III, B, scandium, yttrium and lanthanum, respectively, for fourth, fifth, sixth and long cycles. The 14 elements of nature and LA are very similar, chemists can only put them in a lattice, no wonder some people regard them as "isotope" approach, but because of their different atomic numbers, also cannot be counted as true isotope. That is to say, their properties are very similar, but not exactly the same, which resulted in this group of elements is difficult to separate, but also shows that as long as the use of the very small difference, and separation is possible; on the other hand, their electronic structure has an inner electronic layer is not completely filled, namely 4f layer. Because of the difference in the number of electrons in the 4f layer, each element of the group has a very specific personality, especially the optical and magnetic properties, like a keyboard with a full range and a wide range of pianos.

Q:What's the use of rare earth?: Rare earth materials are used as the key to many major weapons systems, it is also a lot of sophisticated industrial essential raw materials, rare earth elements have electric, magnetic, optical, biological and other properties, is an important basic material information technology, biological technology, energy technology and other high technology fields and national defense construction, at the same time on the transformation of some traditional industries, such as agriculture, chemical industry, building materials and other plays an important role

Q:Rare earth in the end what to do ah?: Rare earth is generally separated from the oxide state, although the earth's reserves are very large, but smelting and purification difficult, it seems relatively rare, named after rare earth. In general, rare earths on earth exist in the form of rare earth oxides.

Q:Use of rare earth? Which industries depend on him?: The catalyst with molecular sieve made of rare earth, has the advantages of high activity, good selectivity and strong resistance to heavy metal poisoning, which replaces the aluminum silicate catalyst used in petroleum catalytic cracking process; in ammonia production process, with a small amount of rare earth nitrate as catalyst, the gas volume is 1.5 times bigger than in Ni Al catalyst; synthesis of isoprene rubber and butadiene rubber in the process of using naphthenic acid rare earth aluminum products three kinds of catalyst, the obtained performance is excellent, with less equipment fubberized, stable operation, postprocessing the advantages of short process; composite rare earth oxides can also be used as an internal combustion engine exhaust purification catalysts, cerium naphthenate is also used as a paint drier etc..

Q:What's the use of rare earth? Why Japan wants to buy Chinese rare earth?: In the aspect of glass ceramics with rare earth oxide or rare earth concentrate after processing, can be used as a polishing powder is widely used in polishing of optical glass, glass sheet, tube, tube, plate glass, plastic and metal tableware; in the glass melting process, using two cerium oxide has very strong oxidation of iron. Reduce the content of iron in glass, in order to achieve the purpose of removing the green glass; rare earth oxides can be made of optical glass and special glass for different purposes, including through infrared, ultraviolet absorbing glass, acid resistant and heat-resistant glass, - X- - ray glass; rare earth in ceramic glaze and glaze. Fragmentation can reduce the glaze, and can make the products show different color and luster, is widely used in ceramic industry. In terms of new material of rare earth cobalt and neodymium iron boron permanent magnetic material, with high remanence, high coercivity and high energy product, is widely used in electronic and aerospace industries; pure rare earth oxides and iron oxide into combinations of garnet single crystal and polycrystal, can be used in microwave and electronic industry;

Q:Method for processing rare earth ore: Warehouse workshop of water: commonly known as the boiler room, this should be a soft water, which is distilled water, in particular in production of this water, because there is no mixed material here.

Q:Why should China export rare earths at a low price?: Rare earth has always been a national strategic resource, and is regarded as the key to the future world.While China's Baiyunebo rare earth ore accounts for 90% of the world's recoverable resources, and 70% of the world's rare earth consumption is exported to China, so Chinese geologists call rare earth "the only blessing God has for the suffering Chinese."". But because of uncontrolled exploitation, wanton export traitorous comprador, coupled with Japan strategic alliance to keep the prices down, in the rare earth resources in the international market prices even offset back mining cost. This kind of situation, people can not help but burst into tears!

Q:What's the stability of rare earth calcium zinc stabilizer? What are the advantages?: Non-toxic, environmentally friendly, non radioactive. Can improve the production environment, labor conditions, reduce environmental pollution, and its products can be detected by the SGS international testing institutions and ROHS standards.

Q:What is the difference between a multicomponent alloy and a rare earth alloy?: Multicomponent alloy (multielementalloy) means an alloy made up of more than two components. Such as Fe-Cr-Al alloy, Ni-Cr-Mo alloy, Fe-Cr-Ni-Mo alloy and so on.Such as Fe-Cr-Al alloy, Ni-Cr-Mo alloy, Fe-Cr-Ni-Mo alloy and so on.Most of the practical metals belong to multicomponent alloys.All industrial steels are iron base alloy.Rare earth iron alloy, is a combination of rare earth elements with iron, rare earth alloy for different uses, the content of rare earth elements are different, which are iron, gadolinium iron dysprosium neodymium iron boron additive of rare earth elements in high purity, China is the world's largest supplier of rare earths, representing the world's supply of rare earths 97% at present, rare earth as an irreplaceable resource is widely used in many high-tech industries, including wind turbines, hybrid vehicles, missiles and mobile phone etc..

We are a professional producer of Ferro Silicon Magnesium, Ferro Silicon Barium Calcium, Ferro Silicon Zirconium, Mould Inoculant and so on. With the fast development of our company, we passed ISO9001: 2008 quality management system certification and ISO14001: 2004 environmental management system certification.

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