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MgF2 Windows are made from Magnesium Fluoride material, which has transparent range from 120-7000 nm. The refractive index is 1.376 at 7000nm.
Specifications:
Material: --------------------------------------------------------- Magnesium Fluoride single crystal
Diameter Tolerance: ------------------------------------------ +0.0, -0.1mm
Thickness Tolerance:------------------------------------------ ±0.2mm
Clear Aperture: ------------------------------------------------->80%
Parallelism:------------------------------------------------------- 1 arc minute
Flatness:----------------------------------------------------------- λ/2 @ 632.8 nm
Surface quality: ------------------------------------------------- 40/20 scratch and dig
Protective Bevel:--------------------------------------------------<0.25x45deg
Coating:-------------------------------------------------------------Uncoated
MgF2 Main Properties and Performance
| Transmission range (μm) | 0.11~7.5 |
| Refractivity (0.7μm) | n0=1.37608 ne=1.38771 |
| Reflection Loss at 0.6μm | 5.2%(both faces) |
| Thermal expansion coefficient (℃-1) | 13.7(//axis c), 8.9(⊥axis c) |
| Thermal conductivity at 300K (Wm-1K-1) | 0.3 |
| Knoop Hardness (kg/mm2) | 415 |
| Solubility (g/100gH2O·0℃) | 0.0002 |
| Density (g/cm3) | 3.18 |
| Melting Point (℃) | 1255 |