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CaF2 (Calcium Fluoride) has transmission range 0.19um to 7um. The refractive index varies from about 1.35 to 1.51 through this range. IR grade Calcium Fluoride is transparent up to 12um. Degradation due to moisture in the atmosphere is minimal, and polished surfaces may be expected to withstand several years exposure to normal atmospheric conditions. Due to its low refractive index, Calcium Fluoride can be used without an anti-reflective coating. Low solubility and wide transmission makes this material useful for many applications, including mirror substrates for UV laser systems, windows, lenses and prisms for UV and IR applications.
CaF2 Characteristics & Transmission Curve 
CaF2 Windows Specifications:
|
Material |
CaF2 |
|
Dimension Tolerance |
+0.0/-0.1mm |
|
Thickness Tolerance |
±0.1mm |
|
Surface Accuracy |
λ/4@632.8nm |
|
Surface Quality |
60-40 |
|
Parallelism |
<1' |
|
Clear Aperture |
>90% |
|
Bevel |
<0.25mm x45° |
|
Coating |
upon request |
CaF2 Windows_Standard Products
CaF2 Lenses Specifications:
|
Material |
CaF2 |
|
Design Wavelength |
587.6m |
|
Focal Length Tolerance |
±1% |
|
Diameter Tolerance |
+0.0/-0.1mm |
|
Thickness Tolerance |
±0.1mm |
|
Surface Accuracy |
λ/2@632.8nm |
|
Surface Quality |
80-50 |
|
Centration |
<3' |
|
Clear Aperture |
>90% |
|
Bevel |
<0.2mmx45° |
|
Coating |
AR Coating |
CaF2 Lenses_Standard Products