OPTICS CRYSTALS LASERS
   
 
Crystal Iceland Spar (CaCO3)

Transmission of synthetic calcite



Crystals of Iceland Spar (Optical Calcite) are famous for high birefringence and transparence in broad region of spectrum. It is ideal material for manufacturing polarizing prisms, beam divergent elements, laser gates and other optical devices. Natural deposits of calcite crystals acceptable in optics are rare. Calcite crystal growth is realized hydrothermal method analogical method is used in synthetic quartz manufacturing process. Synthetic calcite no dispersion in He-Ne beam. In light transmission synthetic calcite is identical to the best sorts of natural crystals of this mineral. .









BASE PROPERTIES

PARAMETER VALUE
OPTICAL  
  Transmission Range   0.2 - 2.5 µm  
  Reflection Loss   for two surfaces
at 0.22 µm for o-ray - 16.9%; for e-ray - 9.2%;
at 0.71 µm for o-ray - 11.7%; for e-ray - 7.4%;
PHSYCAL  
  Density   2,711 g/cm3 at 289 K  
  Melting Temperature   1612 K at 10,3 MPa  
  Decomposition Temperature   1167 K  
  Thermal Expansion   Parallel 25.1 x 10-6 1/K at 323 K Perpendicular 4,9 x 10-6 1/K at 323 K  
  Moh,s hardness scale   3  
  Elastic Constant   C11=13.17 x 10 Din/cm, C12=4.82 x 10 Din/cm,
C13=5.68 x 10 Din/cm, C14=-2.0 x 10 Din/cm,
C22=8.11 x 10 Din/cm, C44=3.5 x 10 Din/cm
CHEMICAL  
  Solubility in water   0,0014 g/l at 298 K  
  Molecular Weight   100.09  
  Lattice constant   a=4.994 A, c=17.081 A, v=368.8 A3  
  Crystal Class   Thrigonal, Space group - R3c.  

Optical Quality
Iceland spar is available in three grades by optical absorption at four wavelengths (index of absorption, 1/ cm).

Spectral Region
Quality Grade
Index of absorption
220 nm 310 nm 400 nm 700 nm
UV

1

0.31 0.22 - -

2

0.35 0.31 - -

3

0.45 0.45 - -
V

1

- - 0.046 -

2

- - 0.097 -

3

- - 0.155 -
IR

1

- - - 0.009

2

- - - 0.018

3

- - - 0.046

Spectral Region Ultra-Violet (UV), Visible (V) and Infra-Red (IR)

REFRACTIVE INDEX
Wavelength, µm Refractive Index, no Refractive Index, ne
 
  0.214   1.8458   1.5599  
  0.218   1.8458   1.5551  
  0.227   1.8130   1.5491  
  0.231   1.8024   1.5455  
  0.245   1.7797   1.5373  
  0.257   1.7605   1.5301  
  0.275   1.7415   1.5227  
  0.303   1.7196   1.5136  
  0.330   1.7052   1.5075  
  0.361   1.6932   1.5022  
  0.396   1.6833   1.4978  
  0.405   1.6843   1.4968  
  0.434   1.6755   1.4942  
  0.436   1.6752   1.4942  
  0.468   1.6703   1.4919  
  0.480   1.6687   1.4912  
  0.481   1.6686   1.4912  
  0.486   1.6678   1.4907  
  0.509   1.6654   1.4898  
  0.527   1.6634   1.4887  
  0.546   1.6618   1.4880  
  0.560   1.6605   1.4874  
  0.578   1.6593   1.4868  
  0.579   16584   1.4864  
  0.579   1.6584   1.4865  
  0.636   1.6556   1.4852  
  0.644   1.6551   1.4850  
  0.656   1.6544   1.4846  
  0.707   1.6521   1.4835  
  0.768   1.6497   1.4826  
  0.795   1.6489   1.4822  



 
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