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Optical Crystals

  • Product Name: MgF2
  • Maximum of Material Diameter:Φ170mm
  • Clear Aperture:85%
  • Surface Flatness:λ/4 at 633nm
  • Surface Quality:20/10

Product overview

Magnesium Fluoride crystal is used as a lens, prism and window for wavelength from 110nm to 7.5μm. It is a most suitable material as window for ArF Excimer Laser, for the reason of its good transmission at 193nm. It is also effective as an, optical polarizing element in the ultraviolet region. Any more MgF2 crystal has fine grain, which is appropriate as a vacuum evaporation coating materials.

Scitlion is able to offer
Various optics for IR & VUV application, using our MgF2 crystal materials
MgF2 VUV Windows for ArF Excimer Laser
Good quality MgF2 crystal blank materials
OEM service for good quality MgF2 crystals

Optical Properties

Transmission Range

110 nm to 7.5 μm


>90% at 193 nm to 6 μm

Refractive Index

No=1.37608; Ne=1.38771 (at 0.7μm)

Reflection Loss

5.2% at 0.6 μm (both surfaces)

Residual Radiation Peak

20 nm

Absorption Coefficient

0.04 cm-1 at 2.7 μm


2.3 x 10-6 /℃ parallel c-axis

1.7 x 10-6 /℃ perpendicular c-axis

Physical Properties


3.18 g/cm3

Melting Point


Thermal Conductivity

0.3 Wm-1K-1 at 300K

Thermal Expansion

13.7 x 10-6 /℃ parallel c-axis

8.9 x 10-6 /℃ perpendicular c-axis

Knoop Hardness

415 with 100g indenter (kg/mm2)

Specific Heat Capacity

1003 J/(kg.k)

Dielectric Constant

1.87  at 1MHz parallel c-axis

1.45  at 1MHz perpendicular c-axis

Youngs Modulus (E)

138.5 GPa

Shear Modulus (G)

54.66 GPa

Bulk Modulus (K)

101.32 GPa

Elastic Coefficient

C11=164; C12=53; C44=33.7

C13=63; C66=96

Apparent Elastic Limit

49.6 MPa (7200 psi)

Poisson Ratio


Chemical Properties


0.0002 g/ 100g water at 20℃

Molecular Weight



Tetragonal Crystal

Cleavage Plane