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MgF2 Crystals

  • Chemically stable.
  • High optical transmittance from the vacuum ultraviolet to the infrared spectrum region(0.11~8.5μm).
  • Used for Optical prisms, lenses, wedges, windows, other optical components and etc.
  • A positive birefringent crystal used for optical fiber communication.

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Material MgF2 Crystal Wavelength 110~8500nm
Size 0.1mm-100mm Surface Quality 20/10 S/D
Optical Axis Orientation <6 arc min Parallelism <1 arc sec
Flatness λ/10 @ 633nm Clear Aperture          >95% of full aperture


Basic Properties:

Transparency Range 0.11~7.5μm Molecular Weight 62.32
Class/Structure Tetragonal, can cleave on C-axis Density 3.177g/cm3
Melting Point 1255℃ Hardness Knoop 415 kg/mm2
Specific Heat Capacity, cal/(g K) 0.24 @ 298K  
Thermal Conductivity 0.3 W/(m K) at 27 °C
Thermal Expansion 13.7and 8.48 x 10-6e/ °C Refractive Index N0=1.3836 Ne=1.3957 @ 0.405μm
Reflection Loss 11.2% @ 0.12 μm (2 surfaces) Dielectric Constant 4.87 parallel and 5.45 perpendicular
Restrahlen Peak 20μm dN/dT +2.3 and +1.7 x 10-6e/ °C at 0.4μm
Elastic Coefficients C11=140.2 C12=89.5 C44=56.8
C33=204.7 C13=62.9 C66=95.7
Young's Modulus (E) 138.5 GPa
Shear Modulus (G) 54.66 GPa Bulk Modulus (K) 101.32 GPa
Apparent Elastic Limit 49.64 MPa Poisson Ratio 0.276
Solubility <0.0002 g/100g water @ 0 °C

MgF2 single crystal is a birefrigent material with particular properties. It has a high resistance to mechanical and thermal shock and radiation. With wide transparent range and high transmissibility, it becomes a popular choice for UV and excimer laser windows, polarizers, prisms, lenses, wedges, windows, and other optical components.