crystaltechno : crystal optics manufacturer


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

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.

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
Spectral Region	Quality Grade	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)


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE




	PARAMETER	VALUE


	Crystal Class	Thrigonal
	Space group	R3c
	Lattice constant	a=4,994A c=17,081A v=368,8 A³
	Cleavage	Excellent following (1011)
	Molecular Weight	100,09
	Density	2,711 g/cm³ at 289 K
	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%;
	Decomposition Temperature	1167 K
	Melting Temperature	1612 K at 10,3 MPa
	Moh,s hardness scale	3
	Thermal Expansion	Parallel 25.1 x 10^-6 1/K at 323 K Perpendicular 4,9 x 10^-6 1/K at 323 K
	Transmission Range	0,2-2,5 µm
	Elastic Constant	c11 13,17 x10 Din/cm c12 4,82 x10 Din/cm c13 5,68 x10 Din/cm c14 -2,0 x10 Din/cm c22 8,11 x10 Din/cm c44 3,5 x10 Din/cm
	Solubility in water	0,0014 g/l at 298 K


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

Wavelength, μm	Refractive Index
Wavelength, μm	n_o	n_e
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
0257	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


MATERIAL	BASE PROPERTIES	REFRACTIVE INDEX	PRODUCTS AVAILABLE

The following products from CaCO₃ are available:

BLANKS

PRISMS