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    AI Overview
    Magnesium Fluoride (MgF₂) Optical Windows | VUV to IR
    Magnesium Fluoride (
    MgF2MgF sub 2
    MgF2
    ) is a premier optical material for vacuum ultraviolet (VUV) and ultraviolet (UV) applications, offering high transmission from
    ∼110
    --
    120
    nm
     up to
    6
    --
    7
    𝜇
    m
     in the infrared. Key features include 90% typical transmission for UV wavelengths (
    193
    nm
    ), high resistance to harsh VUV radiation/color centers, and high durability. 
    Key VUV/UV Transmission Properties 
    • Transmission Range:
      0.11
      𝜇
      m
       to
      ∼7.5
      𝜇
      m
      .
    • VUV Transmittance: VUV-grade
      MgF2MgF sub 2
      MgF2
       is essential for applications below
      150
      nm
      , providing excellent performance at the Hydrogen Lyman-alpha line (
      121.6
      nm
      ).
    • Refractive Index:
      1.4131.413
      1.413
       at
      0.22
      𝜇
      m
      . It is known as one of the lowest-index materials for UV/IR applications.
    • Birefringence:
      MgF2MgF sub 2
      MgF2
       is a positive birefringent crystal. This means its refractive index varies (
      𝑛𝑜
      ≈1.376
      ,
      𝑛𝑒
      ≈1.387
      ). It is typically oriented along the C-axis to avoid birefringence issues in windows.
    • Durability: Resistant to thermal and mechanical shock. It is one of the hardest VUV materials, often chosen for harsh environments.
    • Solarization: High resistance to radiation-induced color centers (solarization), making it ideal for excimer lasers and space applications. 
    Applications 
    • VUV/UV spectroscopy.
    • Excimer laser windows (e.g.,
      193
      nm
      ,
      248
      nm
      ).
    • Hydrogen Lyman-alpha (
      121.6
      nm
      ) detectors.
    • Polarizers and waveplates due to inherent birefringence. 
    MgF2MgF sub 2
    MgF2
     is often preferred over Calcium Fluoride (
    CaF2CaF sub 2
    CaF2
    ) for wavelengths shorter than
    140
    nm
     because of its superior transmission in that region. 
    • VUV-UV Optical Material Properties
      VUV Grade Magnesium Fluoride: VUV Grade Magnesium Fluoride (MgF2) exhibits high transmission properties from ~ 110nm Vacuum UV (VU...
      eSource Optics
    • Vuv Uv Magnesium Fluoride Transmission Properties
      Dispersion Prisms are used in applications that require separating the incident light into its component wavelengths. For example,
      UNI Optics
    • Magnesium Fluoride Windows and Lenses - Knight Optical
      High Durability. Magnesium fluoride is the hardest of the fluoride materials used in optical components, and so is often used wher...
      Knight Optical
    • VUV UV Spherical Lenses - eSource Optics
      VUV Grade Calcium Fluoride*: CaF2 exhibits good transmission properties from ~ 145nm Vacuum UV (VUV) to ~ 8.0um in the Infrared. C...
      eSource Optics
    • The Strengths of Magnesium Fluoride in UV Optics - Fairfield Crystal
      Dec 13, 2024 — Magnesium fluoride (MgF2) is a material that is transparent in UV wavelengths. It has a superior transmission range from IR to UV ...
      Fairfield Crystal
    • Magnesium Fluoride (MgF₂) Optical Windows | VUV to IR
      Magnesium Fluoride (MgF₂) Optical Windows | VUV to IR * Ultra-Wide Transmission Range: 0.11 – 7.5 μm (VUV to mid-IR) * High Optica...
      Shape Optics Technologies
    • Variability in the vacuum-ultraviolet transmittance of ...
      The sample windows were identified by the ingot number, the source of the slice from which they were cut, i.e., either the cone or...
      Optica Publishing Group
    • Refractive properties of magnesium fluoride - Optica Publishing Group
      Olsen and McBride[21] report the percent transmission of Irtran-I as decreasing to 20% at 1.0 μm and to near 0% at 0.5 μm. Buckner...
      Optica Publishing Group
    • MgF2 ( Magnesium Fluoride) Birefringent Crystal Properties
      MgF2 Characteristics & Transmission Curve Magnesium Fluoride (MgF2) is used for optical elements in both the infrared and ultravio...
      Bluebean Optical
    • VUV-UV Optical Material Properties
      VUV Grade Magnesium Fluoride: VUV Grade Magnesium Fluoride (MgF2) exhibits high transmission properties from ~ 110nm Vacuum UV (VU...
      eSource Optics
    • Vuv Uv Magnesium Fluoride Transmission Properties
      Dispersion Prisms are used in applications that require separating the incident light into its component wavelengths. For example,
      UNI Optics
    • Magnesium Fluoride Windows and Lenses - Knight Optical
      High Durability. Magnesium fluoride is the hardest of the fluoride materials used in optical components, and so is often used wher...
      Knight Optical
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    Web results

    VUV-UV Optical Material Properties


    eSource Optics
    http://www.esourceoptics.com › vuv_material_properties
    eSource Optics
    http://www.esourceoptics.com › vuv_material_properties
    VUV Grade Magnesium Fluoride (MgF2) exhibits high transmission properties from ~ 110nm Vacuum UV (VUV) to ~ 6.0um in the Infrared.Read more

    Vuv Uv Magnesium Fluoride Transmission Properties


    UNI Optics
    https://www.uni-optics.com › vuv-uv-magnesium-fluorid...
    UNI Optics
    https://www.uni-optics.com › vuv-uv-magnesium-fluorid...
    Magnesium Fluoride Windows applicable for wide range spectrum, transmits well into the VUV region at the hydrogen Lyman-alpha line and beyond and it is ...Read more

    Magnesium Fluoride Windows and Lenses


    Knight Optical
    https://www.knightoptical.com › ... › Infrared Optics
    Knight Optical
    https://www.knightoptical.com › ... › Infrared Optics
    Magnesium fluoride transmits into the vacuum ultraviolet (VUV), it is durable and creates minimal aberrations. For excimer applications, magnesium fluoride ...Read more
    £25 delivery · 14-day returns

    The Strengths of Magnesium Fluoride in UV Optics


    Fairfield Crystal
    https://fairfieldcrystal.com › the-strengths-of-magnesiu...
    Fairfield Crystal
    https://fairfieldcrystal.com › the-strengths-of-magnesiu...
    Dec 13, 2024 — One of the sought after properties of MgF2 is its superior transmission range from IR to UV wavelengths, even extending to vacuum- UV region.Read more

    Variability in the vacuum-ultraviolet transmittance of ...


    Optica Publishing Group
    https://opg.optica.org › abstract
    Optica Publishing Group
    https://opg.optica.org › abstract
    by H Herzig · 1992 · Cited by 7 — Magnesium fluoride was selected as the material for initial consideration for the prototype domed window because of its UV transmission properties, ease of ...Read more

    Magnesium Fluoride MgF2 - Optical Materials


    Crystran
    https://www.crystran.com › Optical Materials
    Crystran
    https://www.crystran.com › Optical Materials
    Magnesium Fluoride transmits well into the VUV region to the hydrogen Lyman-alpha line (121nm) and beyond. Magnesium Fluoride is used mostly for UV optics ...Read more

    Critical Materials for Vacuum Ultraviolet (VUV) Filter


    Stanford Advanced Materials
    https://www.samaterials.com › content › critical-materials...
    Stanford Advanced Materials
    https://www.samaterials.com › content › critical-materials...
    Sep 1, 2025 — --Magnesium Fluoride (MgF₂): ... MgF₂ is one of the most widely used VUV window materials. It is transmitted down to about 115 nm and can be ...Read more

    Growth and vacuum ultraviolet characteristics of ...


    ScienceDirect.com
    https://www.sciencedirect.com › article › abs › pii
    ScienceDirect.com
    https://www.sciencedirect.com › article › abs › pii
    by Z Luo · 2023 · Cited by 5 — Magnesium fluoride protected aluminum (MgF 2 /Al) vacuum ultraviolet (VUV) coatings were prepared by electron-beam evaporation process with excellent ...Read more

    ISP Optics Magnesium Fluoride (MgF 2 ) Windows


    Edmund Optics
    https://www.edmundoptics.com › isp-optics-magnesium...
    Edmund Optics
    https://www.edmundoptics.com › isp-optics-magnesium...
    ISP Optics Magnesium Fluoride (MgF2) Windows · Excellent Transmission from 0.12 to 7μm · Rugged and Durable · Resistant to Chemical Etching.Read more

    VUV UV Grade Windows


    eSource Optics
    http://www.esourceoptics.com › vuvwindows
    eSource Optics
    http://www.esourceoptics.com › vuvwindows
    Magnesium Fluoride: VUV Grade Magnesium Fluoride (MgF2) exhibits high transmission properties from ~ 110nm Vacuum UV (VUV) to ~ 6.0um in the Infrared. MgF2 ...Read more

    Scholarly articles for VUV/UV Magnesium fluoride transmission properties

    … and reactive hydrogen atoms on depletion of fluorine … - ‎Lojen - Cited by 28
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