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: More than 10 kinds of metal oxides, such as aluminum, zinc, chromium, manganese, titanium, zirconium, silicon, iron and rare earth, have been used in industry.In the polishing powder polishing effect of cerium based polishing powder is best, it has been replaced by other polishing powder (such as SiO2, ZrO2 and Fe2O3) applications, so there will be a cerium based rare earth polishing powder, known as the "king of polishing powder".

Q:What's the use of rare earth?: At present, rare earth has been widely used in metallurgy, petroleum, chemical, textile, medicine, agriculture and other dozens of industries. For example, rare earth steel can significantly improve the wear resistance, corrosion resistance and toughness of steel; rare earth aluminum wire rod can improve the strength and conductivity at the same time reduce the fineness of aluminum; rare earth pesticide in fruit, can kill the pests, but also can improve the fruiting rate; rare earth compound fertilizer can improve soil structure, and can improve the output of agricultural products; rare earth catalyst for China's oil refining industry, cost less than 100 million yuan, but the gasoline and light oil output efficiency many times.

Q:Rare earth in the end what to do ah?: Is the chemistry of rare earth elements in the periodic table lanthanides (La) cerium, lanthanum, praseodymium (Ce) (Pr), neodymium (Nd), promethium (Pm), samarium (Sm) and europium (Eu), gadolinium (Gd), terbium (Tb), dysprosium, holmium (Ho (Dy)), ER (Er), (Tm), thulium ytterbium lutetium (Yb), (Lu), and 15 with lanthanide two elements closely related to scandium (Sc) and yttrium (Y) a total of 17 kinds of elements known as rare earth elements (Rare, Earth).

Q:Use of rare earth? Which industries depend on him?: Rare earth metal silicide or fluoride, added to steel, to refining, desulfurization, and low melting point of harmful impurities, and can improve the processing performance of steel; rare earth ferrosilicon alloy, rare earth silicon magnesium alloy as spheroidizing agent in the production of rare earth nodular cast iron, nodular cast iron because this is particularly suitable for the production of special the complex requirements of nodular iron castings, are widely used in automobile, tractor, diesel engine and other mechanical manufacturing; rare earth metals added to magnesium, aluminum, copper, zinc, nickel and other non-ferrous alloys, physical and chemical properties of the alloys can be improved, and improve the alloy at room temperature and high temperature mechanical properties.

Q:What's the use of rare earth? Why Japan wants to buy Chinese rare earth?: Rare earth ferrosilicon alloy, rare earth silicon magnesium alloy as spheroidizing agent in the production of rare earth nodular cast iron, ductile cast iron, because this is particularly suitable for the production of the special requirements of the complex ductile iron, are widely used in automobile, tractor, diesel engine and other mechanical manufacturing; rare earth metals added to magnesium, aluminum, copper, zinc, nickel, etc. non-ferrous alloys, physical and chemical properties of the alloys can be improved, and improve the mechanical properties of alloy at room temperature and high temperature. Made of rare earth molecular sieve catalyst in petroleum chemical industry, 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, its treatment capacity than Ni Al catalyst 1.5 times; in cis-1,4-polybutadiene rubber and isoprene 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 also can be used as paint drying agent.

Q:Method for processing rare earth ore: Heavy rare earth extraction workshop, extraction workshop, light rare earth yttrium chloride workshop is mainly for separation (based on several different acid solubility), the front of the separation of rare earth carbonate into nitric acid, chloride, carbonate from single element. These can also be sold.

Q:Why should China export rare earths at a low price?: Indium, an important raw material for LCD panels. China banned the export of rare earth, so that the Taiwan region, Japan and South Korea and other countries of the LCD manufacturers tremble with fear, the international market, the LCD facial prices rose!

Q:What's the stability of rare earth calcium zinc stabilizer? What are the advantages?: Rare earth calcium zinc stabilizer can make PVC mixture uniform plasticizing, high plasticizing rate; improve the material flow and uniformity, may be appropriate to reduce the amount of ACR processing aid; and has a unique coupling function and compatibilizing effect of rare earth composite stabilizer, may be appropriate to increase the amount of CaCO3. Its excellent performance can reduce production costs and improve product quality.

Q:What is the difference between a multicomponent alloy and a rare earth alloy?: Aluminum is an alloy of aluminum and copper, magnesium and manganese. This alloy is suitable for pressing and forming. The strength and hardness of the alloy are much larger than those of general aluminum.

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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