Calcium Fluoride
As an established standard in microlithography optics in the semiconductor industry, CaF2 crystals set new standards in optical precision. Their outstanding properties, such as broad transmission in the UV, VIS and IR spectrum and high resistance to environmental influences, make them the ideal choice for demanding applications in research and industry. In Germany, we are the supplier of high-purity synthetic calcium fluoride, which we grow ourselves at our site in Jena (Thuringia) and process into large, customised semi-finished products.
The most important facts about CaF2
Refractive index nd =
1.43384
low refractive index
enables an almost unchanged beam path
Abbe number 𝜈d =
95.23
Low spectral dispersion
minimises chromatic aberration
Thermal conductivity 𝝀=
9.71
@ 20 °C [W/(m*K)]
Compensates for high CTE
Hellma Materials CaF2 crystals: Customised solutions for your optical challenges.
Calcium fluoride (CaF2) from Hellma Materials is a proven optical material with outstanding properties:
- Broad transmission spectrum: Excellent transmission in the UV, VIS and IR range.
- Low dispersion: Minimises chromatic aberrations.
- High resistance to ionising radiation: can be used in space.
- Low non-linear refractive index: Ideal for high-power laser applications.
- Large diameters: Up to 440 mm for demanding applications.
- Due to a high-purity starting material: We grow large high-purity monocrystalline calcium fluorides.
Thanks to these properties, our CaF2 crystals are the first choice for:
- Semiconductor industry: Microlithography optics for maximum precision.
- Vacuum technology: Robust vacuum windows for harsh environments.
Advantages of our calcium fluoride
| Feature | Value | Advantage |
|---|---|---|
| Low refractive index | nd = 1.43384 | Ideal for high-power laser applications |
| Low spectral dispersion | 𝜈d = 95.23 | Minimises chromatic aberrations |
| Outstanding laser resistance for excimer laser optics | 193 nm, 248 nm | Long service life of laser components |
| High, broadband transmission from the deep UV to the IR range | 130 nm to 8 µm | Excellent transmittance in the UV, VIS and IR range |
| Available size of semi-finished products | up to 440 mm | for demanding applications |
Your advantages with semi-finished products from Hellma Materials:
Flexibility in material size: Customised solutions for your specific requirements.
Optimised performance: Achieve maximum optical precision and efficiency.
Reliability: Trust in a proven material with a long service life.
Quality control: All measurement technology including laser laboratory in-house.
