OPTICS CRYSTALS LASERS
   
 
Material BaF2 (Barium Fluoride)

Crystaltechno Ltd. manufactures from BaF2 (Barium Fluoride) the following optics: blanks, windows, plates, polished domes, wedges, prisms and lenses. The transmission range is 0.2 µm - 11 µm.

Barium fluoride is grown by vacuum Stockbarger technique. Polishing is quicker than calcium fluoride using diamond pastes but is less easy to obtain free of sleeks. Barium fluoride is less resistant to attack by water than Calcium Fluoride. Pronounced water attack occurs at 500 °C, but the material can be used to 800 °C in a dry environment. The material is relatively hard but is highly sensitive to thermal shock.








BASE PROPERTIES

PARAMETER VALUE
OPTICAL  
  Transmission Range   0.13 to 10 microns  
  Refractive Index   1.4626 at 2.6 microns  
  Reflection Loss   6.9% at 2.6 µm (2 surfaces)  
  Restrahlen Peak   47 microns  
  dn/dT   -15.2 x 10-6/oC  
         
PHYSICAL  
  Density   4.89 g/cm3  
  Melting Point   1280 °C  
  Thermal Conductivity   11.72 W/(m K) at 13 °C>  
  Thermal Expansion   18.1 x 10-6/°C at -100 to +200 °C  
  Hardness   Knoop 82 kg/mm2 with 500g indenter  
  Specific Heat Capacity   410 J/(kg K) at 27 °C  
  Dielectric Constant   7.33 at 2MHz  
  Young's Modulus (E)   53.07 GPa  
  Shear Modulus (G)   25.4 GPa  
  Bulk Modulus (K)   56.4 GPa  
  Elastic Coefficients   C11 = 89.2 MPa; C12 = 40.0 MPa;
C14=25.4 MPa
 
  Apparent Elastic Limit   26.89 MPa  
  Poisson Ratio   0.343  
CHEMICAL
  Solubility   0.17g/100g water at 23 °C  
  Molecular Weight   175.36  
  Class/Structure   Cubic (111) cleavage  

REFRACTIVE INDEX

  Wavelength, µm 0.26 0.30 0.36 0.48 0.85 3.24  
  Refractive Index 1.51 1.50 1.49 1.48 1.47 1.46  
  Wavelength, µm 5.14 6.50 8.00 8.60 9.20 9.80  
  Refractive Index 1.45 1.44 1.43 1.42 1.41 1.40  

Maximum available size: 200 mm Dia x 50 mm Thk

 



 
 
 
Blanks,
Windows
Wedges
Plano-Convex Lenses
Bi-Convex Lenses
Bi-Concave Lenses
Meniscus
Cylinder Lenses
Right Angle Prisms
Dispersion prisms
Polished Domes


CaF2 Calcium Fluoride and BaF2 Barium Fluoride growth ingots



Ordering Info
 
  (c) Crystaltechno Ltd. Vernadskogo 113-106, Moscow 119571, Russia
+7 (495) 234-5951, 234-5952, 956-7610
fax +7 (495) 433-1551
sales@crystaltechno.com
Site suggestions: webmaster@crystaltechno.com