Compare Model Drawings, CAD & Specs Availability Price
Optical Window, Magnesium Fluoride, 5.0 mm Diameter, 1.0 mm Thick
Optical Window, Magnesium Fluoride, 12.5 mm Diameter, 2.0 mm Thick
Optical Window, Magnesium Fluoride, 25.0 mm Diameter, 3.0 mm Thick
Optical Window, Magnesium Fluoride, 50.0 mm Diameter, 3.0 mm Thick


  • Material
    Magnesium Fluoride
  • Antireflection Coating
  • Surface Flatness
    λ/2 @ 632.8 nm
  • Surface Quality
    40-20 scratch-dig
  • Thickness Tolerance
    ± 0.1 mm
  • Parallelism
    < 1 arc minute
  • Cleaning
  • Clear Aperture
    Central 90% of diameter
  • Diameter Tolerance
    +0.0/-0.1 mm
  • Thermal Expansion Coefficient
    Parallel: 14 x 10-6 K-1 @ 310 K
    Perpendicular: 8.9 x 10-6 K-1 @ 310 K
  • Thermal Limit
    14-15 W m-1 K-1 @ 300 K


Ultra Broadband Applications

As Magnesium Fluoride has the lowest refractive index of all optical glasses, AR coatings are not required to have low surface reflectance. Therefore the windows are not limited to the spectral band of a broadband AR coating, permitting use at any wavelength from Deep UV to IR (120nm - 8 µm). This is ideal for applications requiring transparency across multiple wavelengths simultaneously, such as spectroscopy or fluorescence imaging of samples under vacuum. The windows may also be used in excimer laser applications due to transparency in the deep UV.

Durable Material

Magnesium fluoride is extremely durable compared to other materials which are transparent from the UV to IR spectrum, making it an excellent choice for many biological and military imaging applications.