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calcium fluoride window
calcium fluoride window

CaF2 Crystals

Calcium fluoride is often used in spectroscopic windows and lenses due to its high transmission from 250nm to 7μm. Its low absorption and high damage threshold makes it a popular choice for excimer laser optics. Calcium fluoride’s low index or refraction allows it to be used without an anti-reflective coating. The Knoop hardness of calcium fluoride is 158.3. Calcium Fluoride (CaF2) windows manufactured from vacuum UV-grade calcium fluoride are commonly found in cryogenically cooled thermal imaging systems.

Application of CaF2 Calcium Fluoride Crystal Window


  • VUV, UV, IR optical systems

  • CaF2 crystals used for stable femtosecond white light generation from UV to IR

  • Thermal imaging

  • Fluorescence imaging

  • Excimer laser


Advantages of CaF2 Calcium Fluoride Crystal Window


  • Low Absorption, High Transmission UV Grade Calcium Fluoride

  • Ideal for Applications Ranging from 250nm – 7μm

  • Low Index of Refraction


Specifications of CaF2 Calcium Fluoride Crystal Window


Orientation

Random or as requested

Size

Upon the customer’s request

Diameter Tolerance

+0/-0.1 mm

Thickness Tolerance

+/-0.1 mm

Aperture

>90%

Surface Quality

80/50~10/5 (S/D)

Parallelism

<1 arc minute

Chamfer

0.2-0.5mmx45°

Coating

Uncoated or upon customer’s request


Properties of CaF2 Calcium Fluoride Crystal Window


Transmission Range

0.13 to 10 microns

Refractive Index

1.39908 at 5 microns

Refractive Loss

5.4% at 5 micron

Crystal/Class Structure

Cubic CsCl, Pm3m

Cleavage Plane

No cleavage planes

Density

3.18 g/cc

Hardness(Knoop)

158.3 (100) with 500g indenter

Youngs Modulus

75.8 GPa

Shear Modulus

33.77 GPa

Bulk  Modulus

82.71 GPa

Poisson Ratio

0.26

Elastic Limit

C11=164 C12=53 C44=33.7

Molecular Weight

78.08

Thermal Expansion

47.9×10^-6 /℃ at 273K

Thermal Conductivity

9.71 W m-1K-1

Melting Point

1360 ℃

Specific Heat Capacity

854  J Kg-1K-1

Thermal Expansion

47.9×10^-6 /℃ at 273K

Solubility

0.0017 g/100g water at 20℃


Technical Images of CaF2 Calcium Fluoride Crystal Window


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Head Office: No. 66, 8 Group, Chengbei Village, Yanguan Town, Jiaxing 314411, China;

Hangzhou Branch: Room 1012, Chunhua Bussiness Center, No. 159, Hangbo Street, Shangcheng District, Hangzhou 310009, Zhejiang, China
sales@ostphotonics.com; info@ostphotonics.com +86-0571-86780460