Calcium Fluoride (CaF2)
Calcium Fluoride (CaF2) is an optical material that exhibits high transmittance across a very wide wavelength range, from ultraviolet (UV) to infrared (IR).
Due to its excellent optical properties, it is widely used in various optical components.
Features
- Wide transmission range: Supports vacuum ultraviolet (VUV) to mid-infrared (0.13–10μm)
- Low refractive index: Approximately 1.43 (near 0.6μm wavelength) with minimal reflection
- High laser resistance: Suitable for laser optical systems
- Chemical stability: Resistant to humidity and many chemical substances
- Low birefringence: Ideal for high-precision optical systems
Applications
- Ultraviolet and infrared optical lenses and windows
- Semiconductor lithography equipment (EUV, DUV)
- Laser optical systems
- Prisms and window materials for spectroscopic analysis
- Infrared thermography
Features
| Basic Physical Properties | |
|---|---|
| Material | CaF2 |
| Transmission Wavelength Range (µm) | 0.13～10 |
| Color | Colorless |
| Density (g/cc) | 3.18 |
| >Melting Point (℃) | 1418 |
| Solubility (g･100gH2O) (30℃) | 0.00151 |
| Molecular Weight | 78.08 |
| Crystal System | Cubic System |
| Crystal Structure | Fluorite Type |
| Cleavage Plane | {111} |
| Thermal Properties | |
|---|---|
| Linear Expansion Coefficient α (/℃) (20℃～60℃) | 24×10-6 |
| Thermal Conductivity λ (cal/cm･sec･℃) | 2.41×10-2 |
| Specific Heat Cp (cal/g･℃) | 0.211 |
| Mechanical Properties | |
|---|---|
| Knoop Hardness Hk | 158.3 |
| Young's Modulus E (GPa) | 75.8 |
| Shear Modulus G (GPa) | 33.77 |
| Poisson's Ratio | 0.26 |