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MgF2 substrate, window

MgF2 substrate, window


The main performance parameters

Crystal structure

Tetragonal system

Lattice constant

a=4.621 Å;c=3.051 Å 

The melting point (℃)


Density (g/cm Three )



4 (Mohs)

Thermal expansion coefficient (/℃)

13.7x 10-6 /℃//c;8.9 x 10-6 /℃┴C 

Refractive index

No=1.3777; ne=1.3895

Transmission band



> 94% @ 5m > 85% @ 0.2m 

Color deviation Hf-Hc


The temperature coefficient of dh/dt x 10-6

10.6 @0.8 M

Methods of crystal growth

Bridgeman, Czochralski method

Standard Size

Dia 1", Dia 2", Dia 4"(100mm), 10x10mm, 20x20mm

Standard Thickness

1.0mm, 2.0mm, 5.0mm


Single or double side polished

Crystal orientation

<100>, <001>, <110>,  ±0.5º

Edge orientation precision:

2º  (can reach <1º )

Wafer bevel

According to the specific requirements, offer a specific angle (Tilt angle 1°-45°) of CaF2 wafer

Surface Roughness

Ra: < 5A (5 um * 5 um)

MgF2 application

Infrared window, prism, lens


Class 100 clean bag, 1000 clean room


Magnesium fluoride, MgF2 crystal belongs to tetragonal system, melting point is 1255 °C, high hardness, good mechanical properties, stable chemical properties, not easy to deliquesce and corrode. MgF2 main feature in optical performance is that it has a high transmittance in the vacuum ultraviolet region (more than 80% transmittance at 170 nm), and it is widely used in optical fiber communication, military industry and various optical components.
Magnesium fluoride (MgF2) crystal is suitable for windows and focusing mirrors of deep ultraviolet and excimer lasers. Because MgF2 is a tetragonal birefringent crystal, it is widely used in optical components such as optical fiber communication and wave plates.
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