Magnesium Fluoride(MgF2) windows
Magnesium fluoride has good transmittance in the ultraviolet, visible and infrared fields and is widely used in scientific and technical fields such as lasers, infrared optics, ultraviolet optics and high energy detectors. Compared to other materials, magnesium fluoride materials are particularly durable in the deep UV and far IR wavelength ranges.
Magnesium fluoride highly sought after for many UV and IR applications, and are particularly suitable for applications in the 200 nm - 6.0 μm wavelength range
MgF2 window is one of the basic optical components in optics, usually used as a protective window for electronic sensors or detectors of the external environment. It is used to separate the two sides of the environment, such as separating the inside of the instrument from the outside, so that the inside and outside of the instrument are isolated from each other, thus protecting the internal devices.And it’s widly used in optical systems,laser optical systems and infrared optical systems, such as ultraviolet spectrometer, ultraviolet detector, infrared spectrometer, infrared camera, laser device, LiDAR Etc.
Our Company can provide round ,square and rectangular Magnesium Fluoride window with diamension from 2-300mm and thicknesses from 0.12-60mm (accuracy up to 20-10, 1/10L@633nm),coating AR, BBAR, AF or upon request.
Technical parameters of MgF2 window
Dimension | 2-300mm |
Thicknesses | 0.12-60mm |
Dimension tolerance | +/-0.05mm |
Thickness tolerance | ±0.05mm |
Surface quality (scratch & dig) | 60-40, 40-20, or better |
Surface accuracy | λ/2, λ/4 or better |
Parallelism | 3' ,30'' |
Bevel | 0.1~0.3mm x 45 degree |
Clear aperture | >85%,>90% |
Coating | AR coating or cutom |
Material properties of MgF2
Optical Properties | |
Transmission Range | 0.12-9μm |
Transmittance | >90%@0.193-6μm |
Refractive Index | NO=1.566,Ne=1.568@0.13μm |
NO=1.334,Ne=1.343@5μm | |
Reflection Loss | 11.2%@0.12nm(both surfaces) |
5.7%@0.22μm(both surfaces) | |
5.1%@1μm(both surfaces) | |
Absorption Coefficienet | 40×10-3@2.7μm |
Structure | square crystal system |
Cleavage Planes | <100> |
Physical Properties | |
Density[g/cm3] | 3.177 |
Melting Point [℃] | 1255 |
ThermalConductivity [W/(m×K)] | 21 //c, 33.6⊥c @ 300K |
Thermal Expansion [10-6/K] | 13.7//c, 8.9 ⊥c @ 373k |
Knoop Hardness [kg/mm2] | 415 |
Specific Heat Capacity [J/(kg×K)] | 1003 |
Dielectric Constant | 4.87 //c, 5.44⊥c @ 1MHz |
Young's Modulus (E) [GPa] | 138.5 |
Shear Modulus(G) [GPa] | 54.66 |
Bulk modulus(K) [GPa] | 101.32 |
Poisson Coefficient | 0.276 |
Chemical Properties | |
Solubility / g/L | 0.002g @ 20℃ |
Molecular Weight / g/mol | 62.3018 |
Transmission curve
Magnesium fluoride (MgF2) is a birefringent crystal with excellent optical properties in the ultraviolet band, which is the known optical crystal in the ultraviolet cutoff band.Magnesium fluoride is popular in many UV and IR applications and is ideal for applications in the 200nm-6um.Compared to other materials, magnesium fluoride is particularly durable in the deep ultraviolet and far infrared.
