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?: The content of aluminum and aluminum is very high, and it is relatively pure aluminum. It is soft and can be rolled into various shapes. The daily use of aluminum, aluminum boxes, aluminum sheet, aluminum, aluminum, aluminum is cooked to do. An alloy consisting of two or more than two metals and metals or nonmetals synthesized by a certain method with metallic properties. Usually obtained by fusion of homogeneous liquid and solidification. According to the number of constituent elements, can be divided into two yuan alloy, three yuan alloy and multi-element alloy.

Q: What's the use of rare earth?: 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). Rare earths (RE or R). Rare earth (rare, earth) has "industrial vitamins" laudatory name. Now it has become a very important strategic resource. Rare earth oxide refers to the elements in the periodic table of atomic number from 57 to 71 of the 15 Lanthanide Oxides, as well as with the lanthanide elements similar to the chemical properties of scandium (Sc) and yttrium (Y) oxides of 17 elements. Rare earth elements have been widely used in the fields of petroleum, chemical, metallurgy, textile, ceramics, glass, permanent magnet materials, with the continuous progress of science and technology breakthrough and application technology, rare earth oxide value will become more and more large.

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?: The 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. What's more, rare earth is also a high-tech lubricant for electronics, lasers, nuclear industry, superconductivity, and so on. Once used in military affairs, rare earth technology will inevitably bring about a leap in military technology. In a sense, the US military's partial wars in the cold war, the backward sex control, and the unbridled and open killing of the enemy are due to the superman in the field of rare earth science and technology.

Q: Pink and what is the difference between rare earth polishing powder: Because of the chemical and physical properties better with cerium based polishing powder, so it has been widely used in industrial products such as polishing, polishing in various optical glass devices, television picture tube, optical glasses, tube, plate glass, semiconductor wafer and precision metal products etc..

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!

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