Technical Data CVD Zinc Sulfide
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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.
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 |
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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Also, feel free to call us at the following number: +49 (0) 36 41 288 130.