Calcium Fluoride (CaF2)
Low-dispersion crystal with excellent UV and IR transmission
UV–IR Optical Crystal
Calcium Fluoride is a low-dispersion optical crystal offering excellent transmission from the deep ultraviolet into the infrared. Compared to BaF₂, CaF₂ provides improved mechanical strength and lower birefringence, making it suitable for high-performance imaging systems where chromatic aberration control is critical. It is widely used in lithography, laser optics, and precision imaging applications.
Is this material right for your application?
Use When:
Avoid When:
Consider Alternatives:
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
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
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
Key Properties
Optical
Excellent UV to IR transmission
Very low chromatic dispersion
Low birefringence
Mechanical
Better strength than BaF₂
Moderate hardness
Thermal / Environmental
Good laser damage resistance
Moderate sensitivity to thermal shock
Explore Related Optical Materials
Frequently asked questions about Barium Fluoride specifications and use-cases
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.