OPTICS CRYSTALS LASERS
   
 
Material Potassium Cloride (KCl)

Potassium Chloride KCl is mainly used for CO2 laser protection windows as an inexpensive disposable material and for infrared lenses and prisms when transmission in the (0.2 - 20) micron range is desired. Potassium Chloride is soluble in water and polished surfaces must be protected from exposure to moisture. Maximum operating temperature is 400 degrees C. Maximum available size: 200 mm Dia x 40 mm Thk. Potassium Chloride is produced in large ingots by the Kyropoulos growth method. It cleaves easily. With care KCl material can be polished to a high standard under humidity controlled conditions.

Crystaltechno Ltd. manufactures from KCl crystal the following optics: blanks and windows.






Spectral Transmittance of KCl Uncoated Polished Window thickness 7.8 mm for range (200 - 1100) nm and for range (2.5 - 25) microns.


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

BASE PROPERTIES

PARAMETER VALUE
OPTICAL  
  Transmission Range   (0.21 - 20) microns  
  Refractive Index   1.45644 at 10 microns  
  Reflection Loss   6.8% at 10 micron (2 surfaces)  
  dn/dT   -33.2 x 10-6/K  
  Index of Absorption   1.22 x 10-3 cm-1 at 2.7 micron  
PHYSICAL  
  Density   1.99 g/cm3  
  Melting Point   776 degrees C  
  Thermal Conductivity   6.53 W/(m K) at 322 K  
  Thermal Expansion   36 x 10-6/K at 300 K  
  Hardness   Knoop 7.2 <110>, 9.3 <100> with 200g  
  Specific Heat Capacity   690 J/(kg K)  
  Dielectric Constant   4.64 at 300 K  
  Young's Modulus (E)   29.67 GPa  
  Shear Modulus (G)   6.24 GPa  
  Bulk Modulus (K)   17.36 GPa  
  Elastic Coefficients   C11=39.8 MPa, C12=6.2 MPa,
C44=6.25 MPa
 
  Apparent Elastic Limit   2.3 MPa (330psi)  
  Poisson Ratio   0.216  
CHEMICAL  
  Solubility   34.7g/100g water  
  Molecular Weight   74.55  
  Class/Structure   Cubic FCC, NaCl, Fm3m, (100) cleavage  

REFRACTIVE INDEX

  Wavelength, micron

0.40

0.59 5.30 11.7 15.0 18.1

20.2

22.8 24.3  
  Refractive Index 1.51 1.49 1.47 1.45 1.43 1.41 1.39 1.37 1.35  

 



 
 
 


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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