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Technical Data CVD Zinc Sulfide

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detailed data sheet

The VITRON Spezialwerkstoff GmbH produces polycrystalline ZnS in a chemical vapor deposition process (CVD). We offer two qualities:

Regular grade (FLIR) Zinc Sulfide is a polycrystalline material of high mechanical strength and is especially suited for the spectral range of 7 - 12 µm. Typical applications are exterior windows (coplanar or spherical) of IR optical systems. It is available in various sizes and moderate in price.

Multispectral grade (CLEAR) Zinc Sulfide is treated after growth with a special process to eliminate microscopic voids and defects which occur in the regular grade material. The material is usable in the visible to infrared region from 0.45 – 12 µm.

Classical polishing or Single-Point-Diamond-Machining enables the production of optical components with flat, spherical and/or aspherical and diffractive surfaces. Antireflection coatings can be applied to further improve the transmission.

    Material properties

    Optical properties FLIR CLEAR
    Absorption coefficient (10.6 µm)/cm < 0,2 < 0,2
    Thermo-optic coefficient dn/dT 41x10-610,6 µm 54x10-6.66 µm
    Refractive index homogenity < 100x10-610,6 µm < 20x10-6.66 µm
    Thermal properties
    Thermal conductivity (20°C) (W/mK) 16,7 27,2
    Specific heat (J/gK) 0.469 0.527
    Thermal expansion coefficient (20°C)(x10-6/K) 6,8 6,5
    Mechanical properties
    Modulus of rupture (MPa) 103 69
    Young's modulus (Pa) 74 88
    Knoop hardness (kg/mm2) 210-240 150-165
    Poisson's ratio 0.27 0.27
    Density (g/cm3) 4,08 4,09

    Wave length Refractive index Transmission

    FLIR CLEAR
    µm % 6mm
    0,46 2.459 0 65
    0,50 2.419 0 67
    0.66 2.342 0 69
    0,80 2.313 0 70
    1,00 2.292 0 71
    3,00 2.257 36 72
    4,00 2.252 56 73
    5,00 2.246 65 73
    6,00 2.239 56 73
    7,00 2.232 68 74
    8,00 2.223 71 74
    9,00 2.212 74 75
    10,00 2.200 72 74
    11,00 2.186 58 62
    12,00 2.170 46 61
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