Calcium Fluoride optical windows are transparent from 180 nm to 8 µm, making them ideal for applications such as spectroscopy or fluorescence imaging in the UV, visible, and IR wavelengths.
Ideal for excimer laser applications
Low absorption and high damage threshold
Transparent in UV, Visible, and IR
<1 arc-minute parallelism
Low chromatic aberration compared to other IR materials
CAW: central 90% of diameter 10CF: central 85% of diameter
Diameter Tolerance
CAW: +0.0/-0.1 mm 10CF: ±0.20 mm
Thermal Expansion Coefficient
18.9 x 10-6 K-1 @ 300 K
Thermal Limit
10 W m-1 K-1 @ 273 K
Wavelength Range
250-7000 nm
Features
Ultra Broadband Applications
Calcium Fluoride has both high average transmission and low chromatic aberration compared to most IR materials. Unlike Germanium and Silicon, it is also transparent in the UV and Visible wavelength ranges, making it suitable for applications such as fluorescence imaging, or spectroscopy where operation over many wavelength bands is essential. Other application examples include use in femtosecond IR systems due to low group velocity dispersion in the IR) and use in excimer laser systems due to low UV absorption and high damage threshold).
Low Dispersion
The refractive index of Calcium Fluoride is remarkably stable vs wavelength. Visible chromatic aberration is extremely low with an Abbe Number of 95.31 compared to N-BK7 at 64.17, which means that this material is great for imaging applications. In the infrared region CaF2 is an excellent material to use in ultrafast experiments as it has the lowest group velocity dispersion (GVD) of any IR Material at 1.77 fs2/mm. This is half the GVD of Magnesium fluoride and orders of magnitude lower than Germanium or Silicon.
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