CaF2 Optical Crystals

CaF2 optical crystalsCalcium Fluoride (CaF2 or Fluorite) crystals are transparent in wide spectrum band. The product finds use in windows, lenses operating in UV and IR spectrum band. Laser Use: Calcium Fluoride is also used as a host lattice for laser crystals. Due to its composition, CaF2 has a much longer useful life than most materials when used in fluorine environment.Features:Highest broadband transmittance from deep UV to IR (130 nm up to 8 microns)Low refractive index (nd= 1.43384)Low dispersion (vd= 95.23)Maximum laser durability in Excimer Laser optics (157nm, 193nm, 248 nm)Applications:IR opticsOptics for astronomical instrumentationMicroscope opticsSpectroscopy opticsUV opticsLaser windowsExcimer Laser OpticsMicrolithography OpticsSpecificationCalcium fluoride crystal provides great transmission from the UV to the IR (0.13-11µm). Sythetic CaF2 is used to improve deep UV transmission and to increase the damage threshold. Calcium Fluoride (CaF2) is available doped with Europium as a gamma-ray scintillator.Physical PropertiesCrystal typecubicLattice constant, Åa=5.462Density, g/cm33.18Melting point,℃1360Refractive index @ 1.0μmn=1.4289Transmission range, μm0.13-10Specifications for CaF2 windowsSpectal rangeUV, VIS, IRSurface quality40-20 S & DClear aperture90% of the diameterdiameter tolerance+0, -0.1 mmThickness tolerance±0.1parallelism<3 arcminSurface flatnessλ/4 @ 633 nmPolishing Specification for Optical GradeⅠOrientation Tolerence< 1°Thickness/Diameter Tolerance±0.10 mmSurface Flatness<(λ-2λ)@632nmWavefront Distortion<(2-4)λ@632nmSurface Quality80/50Parallel10ˊPerpendicular60ˊClear Aperture>90%Chammfer<0.2×45°Polishing Specification for Optical Grade ⅡOrientation Tolerence< 0.5°Thickness/Diameter Tolerance±0.10 mmSurface Flatness<(λ/2-λ/4)@632nmWavefront Distortion<(1-2)λ@632nmSurface Quality60/40Parallel1ˊPerpendicular30ˊClear Aperture>90%Chammfer<0.2×45°Polishing Specification for Optical Grade ⅢOrientation Tolerence< 0.2°Thickness/Diameter