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    AI Overview
    Calcium Fluoride CaF2 - Crystran
    Calcium fluoride (
    CaF2cap C a cap F sub 2
    𝐶𝑎𝐹2
    ) square windows are high-transmittance optical components used from deep UV to mid-infrared (130 nm–10
    μmu
    𝜇
    m), ideal for spectroscopy, thermal imaging, and excimer lasers. They feature high damage thresholds, low absorption, and chemical resistance. Stock sizes often range from 12.5mm to 25mm, with options for custom dimensions. 
    Key Features and Properties 
    • Transmission Range: Excellent transmittance from
      0.12
      𝜇
      m (UV) to
      10
      𝜇
      m (IR).
    • Applications: Ideal as protective windows for Fourier Transform Infrared (FTIR) spectroscopy, thermal imaging, and gas detectors.
    • Laser Usage: High damage threshold makes them suitable for high-power laser systems, including excimer lasers.
    • Durability: Relatively high resistance to thermal shock, but are softer and more susceptible to scratches than standard glass.
    • Structure: Often supplied as artificial, single-crystal, or vacuum-UV grade material. 
    Typical Specifications (Square Windows) 
    • Shapes: Square (e.g.,
      12.5
      ×12.5
      mm
      ,
      25
      ×25
      mm
      ).
    • Thickness: Commonly 1mm to 3mm.
    • Refractive Index: Low (
      <1.5is less than 1.5
      <1.5
      ), typically used uncoated due to low reflection loss.
    • Orientation: Random, though specific orientations (
      <111
      >
      ) are available for special applications.       
    Common Suppliers 
    • Edmund Optics: Offers stock 12.5mm and 25mm square windows.
    • Thorlabs: Provides high-precision CaF2 windows.
    • Knight Optical: Supplies IR-grade square windows.
    • Uni-Optics: Customizes square, triangular, and other polygon shapes. 
    Note: CaF2 is sensitive to moisture at high temperatures (above 600°C). 
    • CaF2 Windows — Firebird Optics
      CaF2 windows have the following benefits: * **High transmission range** * **Transmits UV light** * **Durability** * **Thermal stab...
      Firebird Optics
    • 12.5mm Square, 2mm Thick, Uncoated, Calcium Fluoride ...
      TECHSPEC Calcium Fluoride (CaF2) Windows are ideal for use as protective windows in applications in the 200nm - 7000nm range. ✓ Sh...
      Edmund Optics
    • 25mm Square, 3mm Thick, Uncoated, Calcium Fluoride Window
      Specifications * Type: Protective Window. Type of Window: Crystal. * Clear Aperture CA (mm): 22.50 x 22.50. 25.00 x 25.00 +0.0/-0.
      Edmund Optics
    Show all
    • CaF2 Windows — Firebird Optics
      CaF2 windows have the following benefits: * **High transmission range** * **Transmits UV light** * **Durability** * **Thermal stab...
      Firebird Optics
    • 12.5mm Square, 2mm Thick, Uncoated, Calcium Fluoride ...
      TECHSPEC Calcium Fluoride (CaF2) Windows are ideal for use as protective windows in applications in the 200nm - 7000nm range. ✓ Sh...
      Edmund Optics
    • 25mm Square, 3mm Thick, Uncoated, Calcium Fluoride Window
      Specifications * Type: Protective Window. Type of Window: Crystal. * Clear Aperture CA (mm): 22.50 x 22.50. 25.00 x 25.00 +0.0/-0.
      Edmund Optics
    • Calcium Fluoride (CaF₂) Windows - Knight Optical
      Calcium Fluoride (CaF₂) is commonly used for optics looking at the IR and UV spectrums and has a very low change in refractive ind...
      Knight Optical
    • CaF2 Windows
      001 cut CaF2 is a cubic crystal with a surface that is perpendicular to the axis. CaF2 is used in a variety of applications, inclu...
      Newlight Photonics Inc.
    • IR Windows Calcium Fluoride CaF2 Windows - UNI Optics
      Custom made CaF2 windows, CaF2 lenses and wedges according to customer's specifications. CaF2 windows up to 220mm diameter; CaF2 w...
      UNI Optics
    • Square 50-25-1mm Calcium Fluoride CaF2 Crystal Substrate ...
      Calcium Fluoride(CaF2) is a kind of infrared optical window/substrate material with excellent performance, transmittance range of ...
      eBay
    • Calcium Fluoride(CaF2) Windows Supplier - SAM
      Oct 17, 2025 — Calcium Fluoride (CaF2) Windows Description Calcium Fluoride (CaF₂) Windows are highly transparent optical components with excelle...
      Stanford Advanced Materials
    • Calcium Fluoride (CaF 2 ) Windows - Edmund Optics
      TECHSPEC® Calcium Fluoride (CaF2) Windows offer a low index of refraction, providing high transmission from 200 - 7000nm when used...
      Edmund Optics
    • Calcium Fluoride Windows - Thorlabs
      Given its low absorption coefficient and high damage threshold, uncoated calcium fluoride crystal is a popular choice for use with...
      Thorlabs
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    My Ad Center

    Web results

    12.5mm Square, 2mm Thick, Uncoated, Calcium Fluoride ...


    Edmund Optics
    https://www.edmundoptics.com › 125mm-square-2mm-...
    Edmund Optics
    https://www.edmundoptics.com › 125mm-square-2mm-...
    TECHSPEC Calcium Fluoride (CaF2) Windows are ideal for use as protective windows in applications in the 200nm - 7000nm range. ✓ Shop now with Edmund Optics!
    $151.00 · In stock · $10.99 delivery · 30-day returns

    CaF2 Windows


    Newlight Photonics Inc.
    https://www.newlightphotonics.com › CaF2-Windows
    Newlight Photonics Inc.
    https://www.newlightphotonics.com › CaF2-Windows
    CaF2 (Calcium Fluoride) is a cubic crystal with an excellent transmission from 130 nm to 10 μm and has widespread applications as transparent windows in the ...Read more

    Calcium Fluoride (CaF₂) Windows


    Knight Optical
    https://www.knightoptical.com › stock › caf2-windows
    Knight Optical
    https://www.knightoptical.com › stock › caf2-windows
    Calcium Fluoride (CaF₂) is commonly used for optics looking at the IR and UV spectrums and has a very low change in refractive index with ...Read more
    Missing: square ‎| Show results with: square

    Calcium Fluoride Caf2 Square Window


    UNI Optics
    https://www.uni-optics.com › calcium-fluoride-caf2-squa...
    UNI Optics
    https://www.uni-optics.com › calcium-fluoride-caf2-squa...
    It is chemically resistant to common acids and alkali at temperatures up to 1000 °C as well as to HF below 300 °C. These properties encourage its wide use in ...Read more

    Square 50-25-1mm Calcium Fluoride CaF2 Crystal ...


    eBay
    https://www.ebay.com › itm
    eBay
    https://www.ebay.com › itm
    Calcium Fluoride(CaF2) is a kind of infrared optical window/substrate material with excellent performance, transmittance range of 0.12-10um, not easy to ...Read more
    $118.80 · $7.95 delivery

    CaF2 Square plane parallel window 12.5x12.5x0.5


    Del Mar Photonics
    http://www.dmphotonics.com › CaF2_windows › CaF2 S...
    Del Mar Photonics
    http://www.dmphotonics.com › CaF2_windows › CaF2 S...
    For this we use calcium fluoride (CaF2) prisms. Del Mar Photonics has provided high-quality prisms with custom shapes according to our drawings. One of the ...Read more

    Calcium Fluoride Wedged Windows


    Thorlabs
    https://www.thorlabs.com › calcium-fluoride-wedged-wi...
    Thorlabs
    https://www.thorlabs.com › calcium-fluoride-wedged-wi...
    Thorlabs offers Ø1/2", Ø1", and Ø2" wedged calcium fluoride (CaF2) windows that are uncoated or AR-coated for 1.65 - 3.0 µm. These wedged optics eliminate ...Read more
    4-day delivery · 30-day returns

    CaF2 Windows — Firebird Optics


    Firebird Optics
    https://www.firebirdoptics.com › optical-windows › caf2...
    Firebird Optics
    https://www.firebirdoptics.com › optical-windows › caf2...
    These windows are transparent to ultraviolet, visible, and near-infrared light, making them ideal for use in a variety of optical systems.Read more
    $92.00 · In stock · $15 delivery
    Missing: square ‎| Show results with: square

    ISP Optics Calcium Fluoride (CaF 2 ) Windows


    Edmund Optics
    https://www.edmundoptics.com › isp-optics-calcium-flu...
    Edmund Optics
    https://www.edmundoptics.com › isp-optics-calcium-flu...
    These windows are fabricated with IR Grade Calcium Fluoride, featuring low absorption and a high damage threshold in the infrared spectrum.Read more
    30-day returns
    Missing: square ‎| Show results with: square

    Calcium Fluoride (CaF2) Windows


    EKSMA Optics
    https://eksmaoptics.com › uv-and-ir-optics › calcium-flu...
    EKSMA Optics
    https://eksmaoptics.com › uv-and-ir-optics › calcium-flu...
    Calcium Fluoride (CaF2) windows for IR and UV applications. Other calcium fluoride (CaF2) components include CaF2 lenses, mirrors, prisms and beamsplitters.
    Missing: square ‎| Show results with: square
    Popular products
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    • Edmund Optics Calcium Fluoride (caf2) Window 25 X 25 X 3mm.
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    • Edmund Optics Calcium Fluoride (caf2) Window 12.5 X 12.5 X 2mm.
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      Edmund Optics Calcium Fluoride (caf2) Window 12.5 X 12.5 X 2mm
      $80.00
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    • 12.5mm Square, 2mm Thick, Uncoated, Calcium Fluoride Window.
      12.5mm Square, 2mm Thick, Uncoated, Calcium Fluoride Window
      $151.00
      Edmund Optics
      12.5mm Square, 2mm Thick, Uncoated, Calcium Fluoride Window
      $151.00
      Edmund Optics
    • Calcium Fluoride (CaF2) Lens/infrared Lens /CaF2 Infrared Window /CaF2 Optical Window/customizable |.
      Calcium Fluoride (CaF2) Lens/infrared Lens /CaF2 Infrared Window /CaF2 Optical Window/customizable |
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      AliExpress
      Free delivery
      Calcium Fluoride (CaF2) Lens/infrared Lens /CaF2 Infrared Window /CaF2 Optical Window/customizable |
      $18.54
      AliExpress
      Free delivery
    • Janos Optical Calcium Fluoride CaF2 Window.
      Janos Optical Calcium Fluoride CaF2 Window
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      BMI Surplus
      Janos Optical Calcium Fluoride CaF2 Window
      $129.00
      BMI Surplus
    • 7% OFF
      Square 25-25-1mm Calcium Fluoride Caf2 Crystal Substrate Optical. 7% OFF.
      Square 25-25-1mm Calcium Fluoride Caf2 Crystal Substrate Optical
      $84.46$92
      eBay - htj*133085
      7% OFF
      Square 25-25-1mm Calcium Fluoride Caf2 Crystal Substrate Optical
      $84.46$92
      eBay - htj*133085
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