<%@LANGUAGE="VBSCRIPT" CODEPAGE="936"%> OP-Unite Solutions Ltd - CaF2, Calcium Fluoride
 
   
 
 

CaF2

Calcium Fluoride (CaF2) single crystal is an optical material with high transmittance in ultraviolet, visible and infrared regions of the spectrum: 0.15 ¦Ìm ~ 9 ¦Ìm range. CaF2 is widespread used for optical windows, lenses and prisms in the IR application; especially pure grades find useful application in the UV and as UV Eximer (High power applications) laser windows.

Useful: This material has found wide use in high power laser optics due to its low absorption; polished surfaces are stable and will last several years under normal conditions; due to its low refractive index, CaF2 can be used without anti-reflection coating.

Main Properties

Crystal properties

Crystal Growth Method

Vacuum Stockbarger

Max. Size (mm)

<250

Optical properties

Transmission range (um)

0.15~9

Reflection Loss, % for two surfaces at 5 ¦Ìm

5.4

Absorbance

1.7¡Á10-4£¨3.8¦Ìm£©

Refractive Index

See below

Wavelength (um)

Refractive Index (n)

Wavelength (um)

Refractive Index (n)

0.1495

1.5800

4.0000

1.4069

0.1612

1.5490

5.0000

1.3990

0.2000

1.4951

6.0000

1.3856

0.3000

1.4540

7.0000

1.3693

0.4000

1.4419

8.0000

1.3498

0.5000

1.4365

9.0000

1.3268

1.0000

1.4289

10.0000

1.3002

2.0000

1.4239

11.0000

1.2676

3.0000

1.4179

12.0000

1.2299

Transmission Curve

See below

Crystallographic properties

Syngony

Cubic

Lattice Constant, Angstrom (Å)

5.462

Cleavability

<111>

Molecular Weight

78.08

Physical properties

Density, at 291 K

3.18g/cm3

Hardness, Mohs

4

Dielectric Constant for 105 Hz

6.76

Melting point, ¡ãC

1360

Thermal Conductivity, W/m¡¤K at 36¡ãC

9.71

Thermal Expansion, 1/K

(16.2 ~ 19.4) ¡Á 10-6

Specific Heat Capacity, J/(kg¡¤¡ãC) at 40¡ãC

887.6

Knoop Hardness, kg/mm2

178 [100], 160 [110]

Young's Modulus, Gpa
<100>
<111>


146.1
89.9

Shear Modulus, Gpa
<100>
<111>


47.6
33.8

Bulk Modulus, GPa

82.7

Debye Temperature, K

510

Elastic Coefficients

C11=164, C44=33.7, C12=53

Poisson Ratio

0.26