OPTICS CRYSTALS LASERS
   
 
Material Potassium Bromide (KBr)

Potassium Bromide is one of the most useful materials for spectroscopic windows and applications where sensitivity to moisture is unimportant. KBr is the most commonly used as beamsplitter material for IR spectrophotometers. Potassium Bromide is transparent in (0.23 - 28.0) microns range. Potassium Bromide is water soluble and must be protected against moisture, which causes degradation of polished surfaces. Optical KBr material can be used at temperatures up to 300 degrees C. Irradiation of Potassium Bromide produces color centers. Potassium Bromide is being grown by the Kyropoulos method. KBr crystal material is being cleaved easily. KBr optics can be polished to a high standard under controlled humidity conditions.

Crystaltechno Ltd. manufactures from Potassium Bromide the following optics: blanks, windows and lenses.

Spectral Transmittance of KBr Uncoated Polished Window thickness 5mm for range (200 - 1100) nm and for range (2.5 - 25) microns.


Crystaltechno Ltd. offers the manufacturing of KBr optics in available diameter (12.7 - 76.2) mm (in detail please see Catalog).

Perhaps you will find required KBr optics at our stock, please see item Optical Crystals.

BASE PROPERTIES

PARAMETER VALUE
OPTICAL  
  Transmission Range   0.23 to 28 microns  
  Refractive Index   1.52404 (L = 11 microns)  
  Reflection Loss   8.3% at 11 micron (2 surfaces)  
  dn/dT   -40.83 x 10-6/K  
  dn/dµ = 0   4.2 microns  
  Index of Absorption   1.6 x 10-4 cm-1 at 3.8 µ  
         
PHYSICAL  
  Density   2.753 g/cm3  
  Melting Point   730 °C  
  Thermal Conductivity   4.816Wm-1K-1 at 319K  
  Thermal Expansion   43 x 10-6/K at 300 °K  
  Hardness   Knoop 7 in <100> with 200g indenter  
  Specific Heat Capacity   435 J kg-1K-1  
  Dielectric Constant   4.9 at 1MHz  
  Young's Modulus (E)   26.8 GPa  
  Shear Modulus (G)   5.08 GPa  
  Bulk Modulus (K)   15.03 GPa  
  Elastic Coefficients   C11=34.5 MPa, C12=5.4 MPa,
C44=5.08 MPa
 
  Apparent Elastic Limit   1.1 MPa  
  Poisson Ratio   0.203  
CHEMICAL
  Solubility   53.48g/100g water at 273K  
  Molecular Weight   119.01  
  Class/Structure   Cubic FCC, NaCl, Fm3m, (100) cleavage  

REFRACTIVE INDEX

  Wavelength, µm 0.39 0.44 0.49 0.59 1.0 1.50 8.50  
  Refractive Index 1.59 1.58 1.57 1.56 1.55 1.54 1.53  
  Wavelength, µm 12.0 17.0 18.1 20.5 22.0 23.9 25.2  
  Refractive Index 1.52 1.51 1.50 1.49 1.48 1.47 1.46  

Delivery

Maximum available size: 140 mm Dia x 30 mm Thk

 



 
 
 


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
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