Magnesium Fluoride (MgF2)
Magnesium Fluoride (MgF2) optical material for UV, visible, and infrared windows and lenses, with property review for custom windows, lenses, and IR assemblies.
Key Properties
About Magnesium Fluoride (MgF2)
Overview
Magnesium Fluoride (MgF2) is an optical material used for UV, visible, and infrared windows and lenses. Material selection should be based on wavelength range, mechanical limits, coating compatibility, and the final geometry of the optic.
Key Material Properties
| Parameter | Guidance |
|---|---|
| Transmission Range | 0.12-9 μm |
| Refractive Index | No=1.566, Ne=1.568 at 0.13 μm; No=1.334, Ne=1.343 at 5 μm |
| Density | 3.177 g/cm3 |
| Knoop Hardness | 415 kg/mm2 |
| Young's Modulus | 138.5 GPa |
| Thermal Expansion | 13.7 //c, 8.9 perpendicular c *10^-6/K @373 K |
Typical Applications
- UV windows
- IR windows
- Birefringent optics
- Laser optics
- Broadband optical systems
Selection Guidance
MgF2 is often selected for broad spectral use; confirm coating and birefringence-sensitive requirements. Treat the values on this page as engineering selection guidance, then confirm final tolerances, coating, and inspection requirements against the production drawing.
Request Material Review
Use the contact form or email [email protected] with wavelength, size, quantity, coating target, and application notes for a practical material review.