Crystals Materials
Calcium Fluoride (CaF2) used for laser beam collimation and serves as a substrate for various optical components
  • Surface Quality: 10/5 Scratch/Dig MIL-O-1380A
  • Parallelism: < 10″
  • Perpendicularity: < 5'
  • Clear Aperture: > 90%
  • Surface Flatness: < λ/10 @ 632.8 nm
  • Coating: AR/HR/PR coating upon customer's request
  • Quality Warranty Period: One year
  • Calcium fluoride (CaF2) material offers a wide transmission spectrum range (180nm-8.0μm), high damage threshold, low fluorescence, and high homogeneity. It has relatively soft physical properties, making its surface prone to scratching. It is commonly used for laser beam collimation and serves as a substrate for various optical components.

    Specifications of Calcium Fluoride (CaF2)
    Material Calcium Fluoride (CaF2)
    Diameter 3mm ~ 300mm
    Thickness >0.1mm
    Dimension Tolerance +0/-0.02mm
    Angle Tolerance ±15 arcsec
    Surface Accuracy λ/10 @ 633nm
    Surface Quality S/D 10–5
    Pyramid Tolerance <5 arcmin
    Bevel <0.25mm X 45°
    Coating Available upon request
    Physical and optical properties
    Crystal Structure Cubic
    Density 5.27 g/cm³
    Crystal Size <100 μm
    Impurities None > 0.05 mm
    Resistivity > 10^12 ohm-cm
    Dielectric Constant Consult Technical Personnel
    Absorption Coefficient @10.6μm <0.0005 cm^-1
    Thermal Optical Coefficient (dn/dT) @10.6μm 6.1 × 10^-5 ℃
    Refractive Index Uniformity @0.6328μm <3 × 10^-6
    Thermal Conductivity @20°C 0.18 W/cm/℃
    Specific Heat 0.356 J/g/℃
    Linear Expansion Coefficient @20°C 7.57 × 10^-6/℃
    Young's Modulus 67.2 GPa (9.75 × 10^6 psi)
    Fracture Modulus 55.1 MPa (8,000 psi)
    Knoop Hardness 105-120 kg/mm²
    Poisson's Ratio 0.28
    Fracture Toughness 0.5 × 10^6 N/m^3/2

    Stock specification list

    If need other specifications and quantities products, please contact us(
    Part Number Face size Thickness Surface Quality Coating
    WIN-080-020-CaF2 Dia 8.00 mm 2.00 mm 40/20 UnCoated
    WIN-127-020-CaF2 Dia 12.70 mm 2.00 mm 40/20 UnCoated


  • Anti-reflection coatings are available at your specified wavelength.
  • Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.
  • To inquiry or order a finished Calcium Fluoride (CaF2) windows, please specify the specification listed above, for common application, we only need to know the main specification: Cr-dopant concentration, sizes, and coating. For special request, please specify specification in details for evaluation and fabrication.
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