Optical Crystals

Optical Crystals- CaF2

Maximum of Material Diameter：Φ375mm
Clear Aperture： 85%
Surface Flatness：λ/4 at 633nm
Surface Quality：20/10
Product description: Calcium Fluoride crystal shows good optical and thermo-mechanical properties, can be used for optical windows, lenses, prisms within a wide range from 130nm to 9μm. It has optical properties of isotro
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Calcium Fluoride crystal shows good optical and thermo-mechanical properties, can be used for optical windows, lenses, prisms within a wide range from 130nm to 9μm. It has optical properties of isotropy, low absorption and low refractive index, which made CaF2 gain the unique advantages in the application of high power lasers.

Scitlion is able to offer
CaF2 IR viewport Windows for Infrared Thermography at 8μm to 10μm
Various optics for IR & VUV application, using our CaF2 crystal materials
Good quality CaF2 crystal blank materials
OEM service for good quality CaF2 crystals

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Optical Properties
Transmission Range	130 nm to 10 μm
Transmittance	>94% at 193 nm to 7.8 μm
Refractive Index	1.39908 at 5 μm
Reflection Loss	5.4% at 5 μm (both surfaces)
Absorption Coefficient	0.03 cm-1 at 2.6 μm to 2.9 μm
dn/dT	-10.6 x 10-6 /℃
Physical Properties
Density	3.18 g/cm3
Melting Point	1360℃
Thermal Conductivity	9.71 Wm-1K-1 at 286K
Thermal Expansion	18.85 x 10-6 /℃ at 273K
Knoop Hardness	158.3 with 100g indenter (kg/mm2)
Specific Heat Capacity	854 J/(kg.k)
Dielectric Constant	6.76 at 1MHz
Youngs Modulus (E)	75.80 GPa
Shear Modulus (G)	33.77 GPa
Bulk Modulus (K)	82.71 GPa
Elastic Coefficient	C11=164; C12=53; C44=33.7
Apparent Elastic Limit	36.54 MPa (3900 psi)
Poisson Ratio	0.26
Chemical Properties
Solubility	0.0017 g/ 100g water at 20℃
Molecular Weight	78.08
Structure	Cubic Crystal
Cleavage Plane	(111)