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CaF2
The CaF2 is an excellent material in laser optics field. It has very wide transmission range from 130nm to 9500 nm, especially, has the high transmission in IR range. CaF2 is widely used in Laser, IR and UV optics.

 

Calcium fluoride (CaF2) is able to withstand maximum temperatures of up to  800°C in dry atmosphere. In fact, this material is used quite commonly in   cryogenically cooled thermal imaging systems. Due to its high transmission from 130nm to 10μm, it is also used in spectroscopic windows and lenses. Calcium fluoride’s low refractive index allows it to be used without an anti-reflective coating.

The Knoop Hardness of CaF2 is 158.3. Out of all fluoride crystal materials, CaF2 is known to be one of the hardest materials. This is the reason why it is particularly well-suited for use in the manufacturing of a wide range of different lenses, prisms and mirror substrates.In addition, calcium fluoride is both physically stable and chemically inert, which means that windows made of it are highly resistant against any impact.

At high temperature, calcium fluoride crystals are quite weak and react very sensitively to stress



Properties of CaF crystal

Formula

CaF 2

Max size

φ180mm

Transmittive scope (um)

0.15-9.0

Density (g/cm3)

3.18

Melting point (℃)

1418

Mohs hardness

4

Thermal expansion (10-6/K)

16.2-19.4

Thermal conductivity

9.17

Dissolution (g/cm3)

0.0016

Wavelength (um)

0.2

0.5

1.0

5.0

10.0

Reflactive Index

1.4951

1.4365

1.4289

1.3990

1.3002

Absorption coeffcient (cm-1)

0.10@0.2um;0.01@0.4um;0.03@2.7um

 

Specifications:

Size

Diameter up to 220mm (IR grade);

Diameter up to 160mm (UV grade);

Inclusion

None visible

Dimension tolerance

±0.1mm

Oriential tolerance

1 arc minutes

Angle tolerance

1 arc minutes

Scratch/Dig code

10/5 to MIL-O-13830A

Parallelism

6 arc seconds

Flatness

λ/20 @ 632.8nm

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