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Windows
    Windows are optical glass with polished faces that are relatively parallel. They are used to protect laser output. Always windows are AR coated to eliminate reflection, so AR coated windows offer improved transmission when used in industrial displays or computer monitors. Their high transmission makes them ideal for most industrial and laser protecting applications.
  • DETAIL
  • STANDARD PRODUCT
  • BASIC PROPERTIES

  •     CRYSTIK offers all types of windows made of different materials. Special size and materials are also available upon request. In addition, we provide various coating on optical windows.


  • Material

    BK7 Grade A optical glass, UV grade  fused silica

    Dimension Tolerance

    +0.0/-0.2mm

    Thickness Tolerance

    ±0.2mm

    Surface Quality

    Standard: 60/40
    High Precision: 20/10

    Clear Aperture

    >90%

    Wavefront Distortion

    Standard: <λ@633nm per 25mm
    High Precision: <λ/10@633nm per 25mm

    Parallelism

    Standard:<1 arc minute
    High Precision:<10 arc seconds

    Chamfer

    Protected<0.5mmx45°

    Coating

    Uncoated, available

  • Material

    Refractive Index

    Transmission
    Range(um)

    Thermal Expansion
    Coefficient(10-6/K)

    Density(g/cm3)

    BK7

    1.5164@588nm

    330-2100nm

    7.5

    2.52

    Fused Silica

    1.4858@308nm

    185-2500nm

    0.58

    2.20

    Sapphire

    1.755@1000nm

    180-4500nm

    8.4

    3.98

    Calcium
    Fluoride

    1.399@5000nm

    170-7800nm

    18.85

    3.18

    Magnesium
    Fluoride

    no=1.3836(405nm)
    ne=1.3957(405nm)

    120-7000nm

    13.7||a; 8.48||c

    3.17

    Silicon

    3.426@5000nm

    1200-7000nm

    2.55

    2.33

    Germanium

    4.003@10000nm

    2000-14000nm

    5.5

    5.33

    ZnSe

    2.4028(10600nm)

    550-19000nm

    7.6

    5.27

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