Products CaF2（Fluorite）
Characteristic
- The transmitted wavelength region ranges widely from vacuum ultraviolet to infrared.
- The crystalline material shows a low dispersion and also anomalous dispersion. This material can be used to produce an apochromatic lens in combination with other optical materials.
- The crystalline material is physically and chemically stable, and is resistant to water and chemicals.
Canon Video Square
Internal Transmittance
Physical Properties
| Basic Physical Properties | |
|---|---|
| Name of crystal material | CaF2 |
| Transmittance wavelength range（µm） | 0.13～10 |
| Color | Colorless |
| Density (g/cc) | 3.18 |
| Melting point (℃) | 1418 |
| Solubility (g/100gH2O) (20℃) | 0.00151 |
| Molecular weight | 78.08 |
| Crystal system | Cubic |
| Crystal structure | Fluorite type |
| Cleavage plane | ｛１１１｝ |
| Thermal Properties | |
|---|---|
| Thermal Expansion 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 |
| Modulus of Rigidity G (GPa) |
33.77 |
| Poisson Ratio | 0.26 |
Application
Telephoto lens for digital single-lens reflex camera
Astronomical telescope
Television camera
Ultraviolet microscope
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