UV–IR Optical Crystal
Calcium Fluoride (CaF₂)
Low-dispersion crystal with excellent UV and IR transmission
Calcium Fluoride (CaF2) is a low-dispersion optical crystal with broad transmission from the ultraviolet into the infrared. It is used for optical windows and lenses in spectroscopy, laser systems and imaging. Material grade, thickness, operating wavelength and coating must be considered when specifying the component. Global Optics UK supplies custom CaF2 components to customer drawings and specifications.
Is this material right for your application?
Use When:
High optical performance across UV–IR is required
Low chromatic aberration is important in imaging systems
Better mechanical strength is needed compared to BaF₂
Precision lenses or windows are used in demanding optical systems
UV lithography or laser optics are involved
Avoid When:
Severe mechanical shock or vibration is expected
Budget constraints outweigh optical performance benefits
Environmental exposure is uncontrolled without protection
Very high refractive index is required for compact designs
Consider Alternatives:
Barium Fluoride (BaF₂) – wider IR transmission at the expense of strength
Fused Silica – superior thermal stability and laser damage resistance
Magnesium Fluoride (MgF₂) – improved hardness for UV optics
Explore Related Optical Materials
Barium Fluoride (BaF₂)
Magnesium Fluoride (MgF₂)
Fused Silica (SiO₂)
Material specifications and frequently asked questions
FAQ
Q1. What wavelength range is CaF₂ suitable for?
CaF₂ transmits from the deep UV (~130 nm) to the mid-IR (~9 µm).
Q2. Is CaF₂ hygroscopic?
No. CaF₂ is non-hygroscopic and suitable for demanding environments.
Q3. Is CaF₂ suitable for high-precision optics?
Yes. It is widely used in lithography, UV optics, and imaging systems.
Q4. What are common alternatives to CaF₂?
BaF₂, MgF₂, and Fused Silica.
Excellent thermal stability compared to other fluorides.
Can be AR-coated across a wide spectral range.
Higher cost than BK7 but superior UV performance.