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CaF2 Crystal

18 Dec 2020

Calcium fluoride(CaF2) is a very important optical functional crystal, which has good optical properties, mechanical properties and chemical stability. It can be used as optical crystal, laser crystal and inorganic scintillation crystal. It has a wide transmittance range (0.125-10 μm), and is widely used as optical medium from vacuum ultraviolet to mid infrared. CaF2 crystal is an ideal optical material for achromatic lenses because of its special refractive index and relative dispersion. At present, deep UV excimer laser lithography is developing from 193 nm to 121 nm. CaF2 single crystal has the advantages of good ultraviolet transmittance, high laser damage resistance threshold, low stress birefringence and high refractive index, which makes it the best choice for the research of deep UV excimer laser lithography. In terms of laser applications, laser diode pumped CaF2 crystals activated by Er3+, Tm3+, Yb3+ and other 3-valent rare earth ions were obtained at room temperature.

Parameter

Material and Specifications

Orientation

[100] or [001] < ±0.5°

Orientation Tolerance

< 0.5°

Parallelism

<20〞

Perpendicularity

Surface Quality

10-5 (MIL-O-13830A)

Wavefront Distortion

<λ/4@633 nm

Surface Flatness

<λ/8 @633 nm

Clear Aperture

>90%

Thickness/Diameter Tolerance

±0.05 mm

Physical and Chemical Properties

Crystal System

Isometric

Habit

Cubic, massive

Space Group

Fm3m

Class (H-M)

m3m (4/m 3 2/m) – Hexoctahedral

Lattice Constants

5.4626 Å

Z

4

Streak

White

Density

3.175…3.56g/cm3

Melting Point

1418°C

Thermal Conductivity /(W·m-1·K-1@25°C)

9.71@[111]

Heat Capacity/(J ·(kg·K)-1)

854

Thermal Expansion /(10-6·K-1@25°C )

18.9

Young`s Modulus /GPa

75.8

Tenacity

Brittle

Cleavage Quality

Perfect, perfect and easy

Hardness (Mohs)

4

Fracture

Conchoidal

Optical characteristics

Transmission Range

0.125 – 10 µm

Refractive Index

1.432-1.436

Reflective Loss

2.89@4µm

Optical Character

Isotropic

Surface Relief

Moderate

Birefringence

None

Pleochroism

Absent

Dispersion

0.007

Poisson Ratio

0.29

Dielectric Constant

6.76

Index of Refraction

λ(μm)

n

λ(μm)

n

λ(μm)

n

0.18

1.51

0.32

1.45

5.82

1.39

0.19

1.50

0.43

1.44

6.20

1.38

0.21

1.49

0.88

1.43

6.71

1.37

0.22

1.48

2.67

1.42

7.00

1.36

0.24

1.47

3.94

1.41

7.53

1.35

0.27

1.46

5.01

1.40

8.22

1.34

Spectrum

Feature

  • Excellent transmission from 125nm to 10um
  • Good optical properties, mechanical behavior and chemical stability
  • Anisotropy, soft and brittle, high coefficient of thermal expansion and easy cleavage
  • Special refractive index and relative dispersion value
  • Soluble in acids
  • Good ultraviolet transmittance, high laser damage resistance threshold, low stress birefringence and high refractive index

Application

  • Optical crystal, laser crystal(IR, UV, VUV)
  • Optical media and optical material
  • Best material for the study of deep UV excimer laser lithography
  • Substrate, optical waveguide
  • IR analytic, astronomical-und camera lenses and optics for Excimer laser

CONTACT DETAILS
Nanjing Crylink Photonics Co.,Ltd
No.3, Hengda Road, Economic and Technological Development Zone, Nanjing, China
No.200,Zhaoxian Road,Jiading District,Shanghai City
Nanjing
Jiangsu
210038
China
Tel: (86)025-68790684
Fax: (86)025-68790685
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