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  • IR Windows Calcium fluoride CaF2 Windows

    CaF2 has transparent range from 170-7800nm. The refractive index is 1.399 at 5000nm. 1. Low absorption coefficient 2. High damage threshold, 3. Low Dispersion (with an Abbe Number of 95) 4. Low fluorescence 5. Excellent water, chemical, and heat resistance

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CaF2 Window

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IR Windows Calcium fluoride CaF2 Windows

CaF2 has transparent range from 170-7800nm. The refractive index is 1.399 at 5000nm.

1. Low absorption coefficient

2. High damage threshold,

3. Low Dispersion (with an Abbe Number of 95)

4. Low fluorescence

5. Excellent water, chemical, and heat resistance

  • product orgin:

    China
  • shipping port:

    Fuzhou China
  • payment:

    T/T Payment, Western Union
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IR Windows Calcium fluoride (CaF2) Windows


Calcium fluoride (CaF2) is an insoluble ionic compound of calcium and fluorine. It is commonly used as a window material for both infrared and ultraviolet wavelengths, since it is transparent in these regions (about 0.15 μm to 9 μm) and exhibits extremely weak birefringence. Furthermore the material is fairly inert chemically so that these windows are not attacked. Nevertheless, at wavelengths as low as 157 nm, which are interesting to semiconductor manufacturers, the birefringence of calcium fluoride exceeds tolerable limits. This problem with birefringence can be mitigated through optimised growth process. It is particularly important as an ultraviolet optical material for integrated circuit lithography.

CaF2 material advantage

1. Low absorption coefficient 

2. High damage threshold, 

3. Low Dispersion (with an Abbe Number of 95) 

4. Low fluorescence

5. Excellent water, chemical, and heat resistance


We provide artificially-crystallized calcium fluoride components available in IR grade and UV Grade. The cost of UV grade is much expensive than IR grade. 


WTS make customized CaF2 window, CaF2 Lens.


Note:Fluorides are toxic to humans, however CaF2 is considered relatively harmless due to its extreme insolubility


CaF2 Windows SPECIFICATION:

Material: CaF2
Dimension Tolerance: +0.0, -0.1mm
Thickness Tolerance: ± 0.1mm
Surface quality: 80/50
Clear Aperture: >85%
Flatness: λ per 25mm
Parallelism: 3' 
Bevel: <0.25mm X 45°
Coating: Upon requirement


CaF2 Main Properties and Performance
Transmission range (μm) 0.13~9.0
Transmittance 90% (0.3~7μm, 3mm)
Refractivity(5μm) 1.39908
Expansion Coefficient (℃-1) 18.85×10-6
Knoop hardness (kg/mm2) 158.3100
Elastic Coefficients C11=164; C12=53; C44=33.7
Young’s modulus (GPa) 75.79
Poisson’s ratio 0.28
Solubility (g/100gH2O·20) 0.0017
Cleavage plane -111
Density(g/cm3) 3.18
Melting Point(℃) 1360


CaF2 WindowCalcium Fluoride Window


Typical Sizes:

Round Shape Φ5.0; Φ10.0 ; Φ12.7; Φ15.0; Φ20.0; 
Diameter(mm): Φ25.4; Φ30.0; Φ38.1; Φ50.8; Φ76.2
Square Shape: 5.0x5.0 ; 10.0x10.0 ; 15.0x15.0 ; 
WxH(mm) 20.0x20.0; 25.0x25.0; 50.0x50.0
Thickness(mm): 0.5; 1.0; 1.5; 2.0; 3.0; 
4.0; 5.0; 6.0; 8.0; 10.0

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