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Magnesium Fluoride (MgF2)

Magnesium Fluoride (MgF2) is grown by vacuum Stockbarger technique in various diameters.  Magnesium Fluoride is a strong material and polishes very well.  Magnesium Fluoride is slightly birefringent and is normally supplied with the optical axis cut perpendicular to the window face.  Magnesium Fluoride is a water soluble material.  Magnesium Fluoride transmits well into the VUV region and is an excellent choice for Excimer laser applications.  Magnesium Fluoride is one of two materials that will transmit in the VUV 121nm (Lyman Alpha) range.

MPF Products, Inc. does not approve the use of ultrasonic cleaning for any viewport.  We ship our viewports UHV ready.  You may simply blow off the glass to remove any contaminants with clean, dry air.  For additional cleaning steps for particulates or contamination from other processes, please review our cleaning procedures at UHV Viewport Cleaning Notes.

Bake-Out Ramp Rate: 20°C per Minute

– Magnesium Fluoride (MgF2) Transmission Chart

  • UHV Viewport, Calcium Fluoride (CaF2), 157 Grade, UHV Rated Vacuum Optics, 0.90" View Dia, 2.75" Conflat Flange

    157 Grade (1)

    Having a similar transmission range to CaF2, MgF2 is often the best option for low frequency applications. The 157 Grade is the highest quality option, with great transmission at 157 nm. 
  • Standard Grade

    Standard Grade (6)

    Our Uncoated Standard Grade MgF2 viewports are a great choice for low-frequency applications; offering high quality for a reasonable price.