CaF2 Optical Crystals

Calcium Fluoride (CaF2 or Fluorite) crystals are transparent in wide spectrum band. The product finds use in windows, lenses operating in UV and IR spectrum band. Laser Use: Calcium Fluoride is also used as a host lattice for laser crystals.Due to its composition, CaF2 has a much longer useful life than most materials when used in fluorine environment.

Product Details


CaF2 Optical Crystals

Calcium Fluoride (CaF2 or Fluorite) crystals are transparent in wide spectrum band. The product finds use in windows, lenses operating in UV and IR spectrum band. Laser Use: Calcium Fluoride is also used as a host lattice for laser crystals. Due to its composition, CaF2 has a much longer useful life than most materials when used in fluorine environment. 

Calcium Fluoride is used for optical windows, drilled discs, lenses and prisms in transmission range 0.15-9µm. Degradation due to moisture in the atmosphere is minimal, and polished surfaces of the CaF2 windows may be expected to withstand several years exposure to normal atmospheric conditions. Since they are nonaxial, CaF2 crystals do not require consideration of axial direction. Because of CaF2 low refractive index, Calcium Fluoride windows can be used without an anti-reflection coating.Calcium Fluoride is attacked by atmospheric moisture at 600°C, where it begins to soften. The top use temperature is 800C, when moisture is not present. Irradiation of Calcium Fluoride windows causes some loss in UV transmission. CaF2 is sensitive to thermal shock.


Features

Highest broadband transmittance from deep UV to IR (130 nm up to 8 microns)

Low refractive index (nd = 1.43384)

Low dispersion (vd = 95.23)

Maximum laser durability in Excimer Laser optics (157nm, 193nm, 248 nm)


Applications

Achromatic microscope

Laser windows

CaF2 Achromatic lens

CaF2 lens

UV and IR Windows

Excimer Laser Optics

Cryogenically cooled thermal imaging


Material characteristics

Physical and chemical characteristics

Specification

Conventional

High Precision

Materials

CaF2

CaF2

Orientation

<100>, < ±0.5°

<001> or <100>, < ±0.2°

Parallel

10〞

10〞

Perpendicular

10ˊ

surface Quality

40//20

10//5

Wavefront Distortion

λ/4@632nm

λ/8@632nm

Surface Flatness

λ/4@632nm

λ/8@632nm

Clear Aperture

>95%

>95%

Chamfer

<0.2×45°

<0.2×45°

Thickness/Diameter Tolerance

±0.1 mm

±0.1 mm

Maximum dimensions

dia 300×100mm

dia 300×100mm


Type of Material  

single crystal  

Crystal Structure  

Cubic Crystal, a=5.462Å  

Cleavage Planes  

(111)

Density  

3.18 g/cm3

Melting Point  

1360°C  

Molecular Weight  

78.08

Thermal Conductivity  

9.71 Wm-1K-1 at 286K

Specific Heat  

854 J/(kg.k)

Thermal Expansion

18.85 x 10-6 /℃ at 273K

Hardness (Mohs)  

4

Young`s Modulus  

75.80 GPa

Shear Modulus  

33.77 GPa

Bulk Modulus  

82.71 GPa

Rupture Modulus  

0.0365GPa

Elastic Coefficient  

C11=164; C12=53; C44=33.7

Dielectric Constant

6.76 at 1MHz

Solubility in Water

0.0017 g/ 100g water at 20℃

Standard Diameter  

dia300 mm 


Optical characteristics

Transmission Range

0.13 to 10 μm ; >94% at 193 nm to 7.8 μm

Refractive Index  

1.39908 at 5 μm

Reflective Loss 

5.4% at 5 μm (both surfaces)

Poisson Ratio

0.26



Index of Refraction

Wavelength (μm) 

        no

Wavelength (μm) 

 no

0.19

1.515

2.650

1.42

0.21

1.490

3.05

1.417

0.25

1.470

3.4

1.4149

0.33

1.450

3.900

1.41

0.41

1.440

4.4

1.4057

0.88

1.430

5.000

1.4

1.014

1.4288

5.893

1.3871

1.1

1.4283

6.200

1.38

1.25

1.4275

6.483

1.3782

1.65

1.4256

7.000

1.36

1.9

1.4244

7.661

1.357

2.058

1.4236

8.220

1.34

2.45

1.4214

8.84

1.3308



image001.jpg

Transmittance of CaF2 crystal


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