Magnesium fluoride (MgF2) is a birefringent crystal with excellent optical performance in the ultraviolet band, and is currently known as an optical crystal in the ultraviolet cutoff band. MgF2 window is transparent in the Ultraviolet (UV) range and is commonly used in optical systems for UV and infrared (IR) applications.The Transmission of MgF2 is more then 94% from 200nm to 6000nm，Even at 120nm deep ultraviolet band (DUV) the transmittance exceeds 50%.
Magnesium fluoride has good transmittance in the ultraviolet, visible, and infrared fields, and is widely used in technology fields such as lasers, infrared optics, ultraviolet optics, and high-energy detectors.
Magnesium fluoride has high transmittance and low fluorescence radiation, making it an ideal material for ultraviolet photodetectors, ultraviolet lasers, and ultraviolet optical systems.
| Code NO. | Material | Diameter | Thickness | Flatness |
| MgF2 Window 01 | UV grade MgF2 | 5 mm | 1.0 mm | λ/2 |
| MgF2 Window 02 | UV grade MgF2 | 10 mm | 1.5 mm | λ/2 |
| MgF2 Window 03 | UV grade MgF2 | 12.5 mm | 2 mm | λ/2 |
| MgF2 Window 04 | UV grade MgF2 | 12.7 mm | 2 mm | λ/2 |
| MgF2 Window 05 | UV grade MgF2 | 15 mm | 2 mm | λ/2 |
| MgF2 Window 06 | UV grade MgF2 | 15 mm | 2 mm | λ/2 |
| MgF2 Window 07 | UV grade MgF2 | 20 mm | 2 mm | λ/2 |
| MgF2 Window 08 | UV grade MgF2 | 20 mm | 3 mm | λ/2 |
| MgF2 Window 09 | UV grade MgF2 | 25 mm | 1 mm | λ/2 |
| MgF2 Window 10 | UV grade MgF2 | 25 mm | 3 mm | λ/2 |
| MgF2 Window 11 | UV grade MgF2 | 25 mm | 5 mm | λ/2 |
| MgF2 Window 12 | UV grade MgF2 | 25.4 mm | 1 mm | λ/2 |
| MgF2 Window 13 | UV grade MgF2 | 25.4 mm | 3 mm | λ/2 |
| MgF2 Window 14 | UV grade MgF2 | 25.4 mm | 5 mm | λ/2 |
| MgF2 Window 15 | UV grade MgF2 | 30 mm | 3 mm | λ/2 |
| MgF2 Window 16 | UV grade MgF2 | 38.1 mm | 3 mm | λ/2 |
| MgF2 Window 17 | UV grade MgF2 | 50.8 mm | 3 mm | λ/2 |
| MgF2 Window 18 | UV grade MgF2 | 50.8 mm | 5 mm | λ/2 |
Attribute | Specification |
Typical Diameter (Φmm) | 10.0, 12.7, 15.0, 20.0, 25.4, 50.8 |
Square Shape:WxH(mm) | 12.7x12.7,25.4x25.4,50.8x50.8 |
Typical Thickness (mm) | 1.0, 2.0, 3.0, 4.0, 6.35,12.7 |
Diameter Tolerance (mm) | +0.0/-0.1 |
Thickness Tolerance (mm) | ±0.05 |
Clear Aperture | >90% |
Parallelism | 30 arc sec |
Surface Quality | 40/20 |
Flatness(@632.8nm) | λ/2 |
Coating | Uncoated or AR Coating |
What is the transmission of MgF 2 ?
MgF2 is transparent in the ultraviolet (UV) range and is commonly used in optical systems for UV and infrared (IR) applications.The Transmission of MgF2 is more then 94% from 200nm to 6000nm，Even at 120nm the transmittance exceeds 50%.
Some parameters of Magnesium fluoride (MgF2) materials as follow :
Refractive index of MgF2 : n=1.4231@200nm ; n=1.3990@266nm; n=1.3340@5000nm; n=1.2912@7000nm
Abbe number of MgF2 : Vd = 106.22
Chromatic dispersion of MgF2 : dn/dλ = -0.018522 µm-1
Group index of MgF2 : ng = 1.3886
Group velocity dispersion of MgF2
GVD = 30.538 fs2/mm
D = -166.60 ps/(nm km)
Dispersion formula of MgF2
