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RONAR-SMITH® LASER OPTICS & IR IMAGING

Infrared Optical Material - CaF2

Infrared Optical Material - CaF2 |GaAs | Ge | MgF2| ZnSe | ZnS |Sapphire| Si  |
Calcium Fluoride is used for optical windows, lenses and prisms in the 0.15 ¦Ìm - 9 ¦Ìm (ultraviolet to infrared) regions. The low power absorption has made this material attached to wide use in high power laser optics. Polished surfaces are stable and will last several years under normal conditions. Due to its composition, CaF2 has a much longer usable lifetime than most materials operating in fluorine environments. 
Calcium Fluoride, which is grown by vacuum Stockbarger technique, has a low refractive index, hence can be used without anti-reflection coating. Material for IR use is grown using naturally mined fluorite, in large quantities at relatively low cost. 
Maximum available size: 380 mm Dia x 70 mm Thk

Calcium Fluoride (CaF2)

BASE PROPERTIES  

PARAMETER

VALUE

OPTICAL 

Transmission Range

0.13 to 10 microns

Refractive Index

1.39908 at 5 microns

Reflection Loss

5.4% at 5 microns (2 surfaces)

Restrahlen Peak

35 microns

dN/dT

-10.6 x 10-6e/¡ãC

PHYSICAL  

Density

3.18 g/cm3

Melting Point

1360 ¡ãC

Thermal Conductivity

9.71 W/(m*K)

Thermal Expansion

18.85 x 10-6e/¡ãC

Hardness

Knoop 158.3 kg/mm2 (100)

Specific Heat Capacity

854J/(kg K)

Dielectric Constant

6.76 at 1MHz

Young's Modulus (E)

75.8 GPa

Shear Modulus (G)

33.77 GPa

Bulk Modulus (K)

82.71 GPa

Elastic Coefficients

C11=164 MPa, C12=53 MPa, C44=33.7 MPa

Apparent Elastic Limit

36.54 MPa

Poisson Ratio

0.26

CHEMICAL  

Solubility

0.0017g/100g water at 20 ¡ãC

Molecular Weight

78.08

Class/Structure

Cubic (111) cleavage

REFRACTIVE INDEX  

Wavelength, ¦Ìm

0.19

0.21

0.25

0.33

0.41

0.88

Refractive Index

1.51

1.49

1.47

1.45

1.44

1.43

 

Wavelength, ¦Ìm

2.65

3.90

5.00

6.20

7.00

8.22

Refractive Index

1.42

1.41

1.40

1.38

1.36

1.34


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