| Material | MgF2 Crystal | Wavelength | 110~8500nm |
| Size | 0.1mm-100mm | Surface Quality | 20/10 S/D |
| Optical Axis Orientation | <6 arc min | Parallelism | <1 arc sec |
| Flatness | λ/10 @ 633nm | Clear Aperture | >95% of full aperture |
Basic Properties:
| Transparency Range | 0.11~7.5μm | Molecular Weight | 62.32 |
| Class/Structure | Tetragonal, can cleave on C-axis | Density | 3.177g/cm3 |
| Melting Point | 1255℃ | Hardness | Knoop 415 kg/mm2 |
| Specific Heat Capacity, cal/(g K) | 0.24 @ 298K 0.362@1700K |
Thermal Conductivity | 0.3 W/(m K) at 27 °C |
| Thermal Expansion | 13.7and 8.48 x 10-6e/ °C | Refractive Index | N0=1.3836 Ne=1.3957 @ 0.405μm |
| Reflection Loss | 11.2% @ 0.12 μm (2 surfaces) | Dielectric Constant | 4.87 parallel and 5.45 perpendicular |
| Restrahlen Peak | 20μm | dN/dT | +2.3 and +1.7 x 10-6e/ °C at 0.4μm |
| Elastic Coefficients | C11=140.2 C12=89.5 C44=56.8 C33=204.7 C13=62.9 C66=95.7 |
Young's Modulus (E) | 138.5 GPa |
| Shear Modulus (G) | 54.66 GPa | Bulk Modulus (K) | 101.32 GPa |
| Apparent Elastic Limit | 49.64 MPa | Poisson Ratio | 0.276 |
| Solubility | <0.0002 g/100g water @ 0 °C | ||
Magnesium Fluoride (MgF2) single crystal belongs to the tetragonal system, is a positive uniaxial crystal with a wide transmission spectrum from Deep UV (DUV) to Long Wavelength Infrared (LWIR), which is 110nm to 7500nm, and in particular outstanding optical transmittance in the Vacuum UV (VUV), which is >80% transmittance at 170 nm. MgF2 crystals have a high resistance to thermal and mechanical shocks and optical radiation, and it exhibit excellent chemical stability with immunity to corrosion and deliquescence. Due to its excellent DUV transmission, MgF2 crystals have become the most suitable materials for 193nm ArF and 248nm KrF excimer lasers. Furthermore, MgF2 has a large birefringence, which makes it suitable for the fabrication of waveplates. MgF2 crystals can be used in MWIR and LWIR thermal imaging applications, and fiber communication, and it is also harnessed for thin film growth.
Shanghai North Optics offers MgF2 crystal ingots, blanks, and polished/coated optics made using MgF2. Optical windows, polarizers, prisms, lenses, wedged windows, and waveplates made from MgF2 single crystals with high laser grade precision are also available, the MgF2 optical components are excellent for integration into 193nm ArF excimer lasers and other Ultra-Violet (UV) lasers.
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