Optics >>> Optical Material >>> MgF2

MgF2 is a birefrigent material crystal with excellent physical and chemical properties. It provides wide transparent range, high transmissibility. MgF2 is a rugged material resistant to chemical etching, mechanical, and thermal shock. High vacuum UV transmission and resistance to laser damage make MgF2 a popular choice for VUV and excimer laser windows, polarizers, and lenses. 


  • Lattice constant: a=4.621; c=3.053 
  • Mohs hardness: 6 
  • Density: 3.17g/cm3 
  • Transparence range: 0.12 - 8.5m 
  • Thermal conductivity: 0.0075W/m/K 
  • Expansion coefficient: aa=13.7x10-6/K; ac=8.48x10-6/K 
  • Refraction Index: @405nm no=1.3836, ne=1.3957 

Transmission Curve:

Physical Properties  
Lattice constant a=4.621A; c=3.053A
Mohs hardness 6
Melting Point 1255 C
Density 3.18g/cm3 (at 291K)
Transparence range 0.12 - 8.5mm
Thermal conductivity 0.0075W/m/K
Expansion coefficient aa=13.7x10-6/K; ac=8.48x10-6/K
Elastic Coefficients C11=140.2 C12=89.5 C44=56.8 
33=204.7 C13=62.9 C66=95.7
Apparent Elastic Limit 49.6 MPa (7200 psi)
Poisson Ratio  0.276 


Optical Properties  
Transparence range 0.12-8.5mm
Absorption Coefficient  40 x 10-3 cm-1 at 2.7m 
Reflection Loss  5.2% at 0.6 microns (2 surfaces) 
Restrahlen Peak  20m 
dN/dT  2.3 (parallel) & 1.7 x 10-6 (perp) at 0.4m 
dN/d  = 0 1.4m 



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