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    Optical Crystals

    • Product Name: CaF2
    • Maximum of Material Diameter:Φ375mm
    • Clear Aperture: 85%
    • Surface Flatness:λ/4 at 633nm
    • Surface Quality:20/10

    Product overview

    Calcium Fluoride crystal shows good optical and thermo-mechanical properties, can be used for optical windows, lenses, prisms within a wide range from 130nm to 9μm. It has optical properties of isotropy, low absorption and low refractive index, which made CaF2 gain the unique advantages in the application of high power lasers.

    Scitlion is able to offer
    CaF2 IR viewport Windows for Infrared Thermography at 8μm to 10μm
    Various optics for IR & VUV application, using our CaF2 crystal materials
    Good quality CaF2 crystal blank materials
    OEM service for good quality CaF2 crystals
    Orientation:<100>、<110>、 <111>




    Optical Properties

    Transmission Range

    130 nm to 10 μm


    >94% at 193 nm to 7.8 μm

    Refractive Index

    1.39908 at 5 μm

    Reflection Loss

    5.4% at 5 μm (both surfaces)

    Absorption Coefficient

    0.03 cm-1 at 2.6 μm to 2.9 μm


    -10.6 x 10-6 /℃

    Physical Properties


    3.18 g/cm3

    Melting Point


    Thermal Conductivity

    9.71 Wm-1K-1 at 286K

    Thermal Expansion

    18.85 x 10-6 /℃ at 273K

    Knoop Hardness

    158.3 with 100g indenter (kg/mm2)

    Specific Heat Capacity

    854 J/(kg.k)

    Dielectric Constant

    6.76 at 1MHz

    Youngs Modulus (E)

    75.80 GPa

    Shear Modulus (G)

    33.77 GPa

    Bulk Modulus (K)

    82.71 GPa

    Elastic Coefficient

    C11=164; C12=53; C44=33.7

    Apparent Elastic Limit

    36.54 MPa (3900 psi)

    Poisson Ratio


    Chemical Properties


    0.0017 g/ 100g water at 20℃

    Molecular Weight



    Cubic Crystal

    Cleavage Plane