MgF2 Crystal (Magnesium Fluoride)
Magnesium fluoride crystals transmit over 0.11μm--8.5μm. Irradiation does not create color centers. Good mechanics withstand thermal/mechanical shock, and cleavage requires substantial force. Slight birefringence means single crystals are usually cut with the optical axis perpendicular to the wafer. Yingying Optics supplies windows, prisms, cylindrical lenses, lenses and wedges, including drawing-based customization. MgF2 is tetragonal and birefringent, with broad 0.11-8.5μm transmission.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Temperature Coefficient of Refractive Index Δno/ΔT [497.4 nm] | 2.3 x 10-6 |
| Temperature Coefficient of Refractive Index Δno/ΔT [706.5 nm] | 1.9 x 10-6 |
| Refractive Index (no) [Wavelength 121 nm] | 1.62750 |
| Refractive Index (ne) [Wavelength 121 nm] | 1.63200 |
| Refractive Index (no) [Wavelength 140 nm] | 1.50950 |
| Refractive Index (ne) [Wavelength 140 nm] | 1.52300 |
| Refractive Index (no) [Wavelength 178 nm] | 1.43975 |
| Refractive Index (ne) [Wavelength 178 nm] | 1.45365 |
| Refractive Index (no) [Wavelength 436 nm] | 1.38203 |
| Refractive Index (ne) [Wavelength 436 nm] | 1.39402 |
| Refractive Index (no) [Wavelength 488 nm] | 1.38016 |
| Refractive Index (ne) [Wavelength 488 nm] | 1.39206 |
| Refractive Index (no) [Wavelength 546 nm] | 1.37855 |
| Refractive Index (ne) [Wavelength 546 nm] | 1.39039 |
| Refractive Index (no) [Wavelength 588 nm] | 1.37770 |
| Refractive Index (ne) [Wavelength 588 nm] | 1.38960 |
| Refractive Index (no) [Wavelength 656 nm] | 1.37661 |
| Refractive Index (ne) [Wavelength 656 nm] | 1.38835 |
| Refractive Index (no) [Wavelength 1000 nm] | 1.37964 |
| Refractive Index (ne) [Wavelength 1000 nm] | 1.38521 |
| Refractive Index (no) [Wavelength 2000 nm] | 1.36800 |
| Refractive Index (ne) [Wavelength 2000 nm] | 1.37922 |
| Refractive Index (no) [Wavelength 3000 nm] | 1.36000 |
| Refractive Index (ne) [Wavelength 3000 nm] | 1.37060 |
| Refractive Index (no) [Wavelength 4000 nm] | 1.35750 |
| Refractive Index (ne) [Wavelength 4000 nm] | 1.36200 |
| Refractive Index (no) [Wavelength 5000 nm] | 1.33020 |
| Refractive Index (ne) [Wavelength 5000 nm] | 1.33930 |
| Refractive Index (no) [Wavelength 7000 nm] | 1.30870 |
| Refractive Index (ne) [Wavelength 7000 nm] | 1.31010 |
| Number Density | 3.16 g/cm3 |
| Melting Point | 1255℃ |
| Boiling point | 2239℃ |
| Molar Mass | 62.32 |
| Thermal Conductivity | 3.15W/m K |
| Specific Heat | 920 J/(kg K) |
| Coefficient of Thermal Expansion | ⊥C 9×10–6∥C 14 ×10–6 / K |
| Knoop Hardness | 415,576 kg/mm2 |
| Mohs Hardness | 5--6 |
| Young's Modulus | 138.5 GPa |
| Shear Modulus | 54.66 GPa |
| Bulk Modulus | 101.32 GPa |
| Fracture Strength | 49.6 MPa |
| Elastic Coefficient | C11=140 C12=89 C44=57 C13=63 C66=96 |
| Dielectric Constant [105 ~107 Hz] | 105 ~107 Hz 5.45 |
| Solubility in Water [18℃] | 0.0076 g / 100 g, 18℃ |
| Lattice Constants | a=4.64 ?, c=3.06 |
| Crystal Type | Tetragonal,P42/mnm |
| Cleavage Plane | (100), (110) |
| Absorption Coefficient [at 0.2μm / at 5.0μm] | 0.07 at 0.2μm,0.02 at 5.0μm |
| Poisson’s Ratio | 0.276 |
| Transmission range | 0.11 - 8.5 μm |
| Vapor Pressure [at 1150℃ / at 1300℃] | 1 Pa(at 1150℃), 10 Pa(at 1300℃) |
| Fluorescence [excitation at 590 nm] | weak yellow upon excitation at 590 nm |
Applications
Key Features
Datasheet
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