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: What's the stability of rare earth calcium zinc stabilizer? What are the advantages?: Rare earth with ultraviolet absorption, emission characteristics of visible light, ultraviolet radiation can reduce the destruction of PVC molecule, improve product performance or aging, can reduce the dosage of anti ageing agent under the same performance conditions, reduce costs.

Q: Method for processing rare earth ore: A carbon workshop: add ammonium chloride nitrate compounds, rare earth carbonate travel. This rare earth carbonate can also be sold, but it's small.

Q: What's the use of rare earth? Why Japan wants to buy Chinese rare earth?: In the military aspects of rare earth industry "gold", because of its excellent photoelectric magnetic and other physical properties, and other materials composed of new materials, the performance of different varieties, the most obvious function is to greatly improve the quality and performance of other products. For example, the tactical performance of steels, aluminum alloys, magnesium alloys and titanium alloys for tanks, aircraft and missiles has been greatly improved.

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..

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?: Military: because of its excellent photoelectric magnetic and other physical properties, and other materials composed of new materials, the performance of different varieties, the most obvious function is to greatly improve the quality and performance of other products. For example, the tactical performance of steels, aluminum alloys, magnesium alloys and titanium alloys for tanks, aircraft and missiles has been greatly improved. What's more, rare earth is also a high-tech lubricant for electronics, lasers, nuclear industry, superconductivity, and so on.Metallurgical Industry: 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, 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 and other 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.

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: Pink and what is the difference between rare earth polishing powder: Information, biology, new materials, new energy, space and oceans are pushing for the contemporary scientists six new technology research group, rare earth, rare earth, rare earth, attention is the development for the rare earth elements have to display their skills in the six science and Technology Group in the world. However, rare earth elements are, after all, a group of elements that are not yet fully understood, which requires great efforts to study and understand them so as to hold them and make greater contributions to mankind.

Q: Why should China export rare earths at a low price?: The use of yttrium plasma is not easy, the monopoly of several major plasma manufacturers are faced with patent, no material dilemma.The master boldly predicted that China's ban on rare earth exports would accelerate the demise of the plasma, while the LCD panel production line was forced to move to the mainland.In the next few months, the decline in flat-panel TVs will stop. Thereafter, a steady price period will continue. And two years later, the completion of the production line transfer, and will open the door of LCD price reduction.

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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