• alpha-BBO
  • Calcite
  • Cr4+YAG
  • Fluoride
  • Sapphire
  • TeO2
  • TGG
  • YAG
  • YVO4
  • Sapphire

    Sapphire (Al2O3) is the hardest oxide crystal, has a combination of perfect optical and physical properties that make it the best choice for some demanding applications. LNG Optics focus on optical applications only, offer custom made windows and other optical components.


    Main properties of Sapphire crystal:

    Transparency Range: 170-5500nm

    Absorption Coefficient: 0.3×10-3/cm @ 2.4μm

    Refractive Indices (no): 1.83 @ 260nm, 1.76 @ 633nm, 1.63 @ 5000nm

    Crystal Structure:Hexagonal

    Lattice Constant: a=4.785Å, c=12.991Å

    Density: 3.98 gram/cm3

    Mohs hardness: 9

    Young's Modulus: 435 GPa

    Melting Point: 2030

    Thermal Conductivity:     40 W/m·K

    Thermal Expansion Coef. @ 25: //C 5.6, C 5.0 (10-6/K)


    Features & Standard Specifications from LNG Optics:

    Diameter tolerance: +0/-0.1mm, Thickness tolerance: ±0.2mm

    Surface quality: 60/40 S/D

    Flatness: λ/4 @ 633nm

    Transmission Wavefront Distortion: λ/4 per inch @ 633nm

    Parallelism: 3 arc minutes

    Perpendicularity: 5 arc minutes

    Chamfer: 0.1mm x 45°

    Lens, Prisms, Light pipes and AR, HR coated elements are available upon request.