OPTICS CRYSTALS LASERS
   
 
Material - Zinc Sulphide (ZnS)

Zinc Sulphide (ZnS) is used for manufacturing of infrared IR optics: ZnS windows and ZnS lenses in spectral range (0.4 - 13.5) microns where maximum transmission and lowest absorption is required, and also selected for use where visible alignment is an advantage.

To obtain high transmittance ZnS crystals are grown by Chemical Vapor Deposition process (CVD). CVD Zinc Sulphide is polycrystalline material which is used in the optical components in infrared IR optical devices.

ZnS (Zinc Sulphide) Chemical Vapor Deposition (CVD) material is produced by synthesis from zinc vapour and H2S gas, forming as sheets on graphite susceptors (CVD-ZnS processes). CVD-ZnS has a polycrystalline structure; the grain size of CVD Zinc Sulphide material is controlled to produce maximum strength and machinability.

ZnS (Zinc Sulphide) multispectral grade is then Hot Isostatically Pressed (HIP) to improve the mid IR transmission and produce the visibly clear form. Polycrystal ZnS is available.

    Crystaltechno Ltd.
  • grows Zinc Sulphide (CVD ZnS ) ingots transparent in the spectral range (0.37 - 13.5) microns.
  • manufactures from Zinc Sulphide (CVD ZnS ) the following optics: blanks, protective plates, windows, domes, wedges, lenses and meniscus These products are used for infrared applications.



Spectral Transmittance (T) of CVD-ZnS Uncoated Polished Window thickness 5mm for range (200 - 1100) nm and for range (2.5 - 25) microns.


You can order the different ZnS optics from CVD ZnS material.
Crystaltechno Ltd. offers the manufacturing of ZnS optics (in detail please see Catalog):

Perhaps you will find required ZnSe optics at our stock, please see item Optical Crystals.

BASE PROPERTIES

PARAMETER VALUE
OPTICAL  
  ZnS Transmission Range   0.37 to 13.5 microns  
  Refractive Index   2.20084 at 10 microns  
  Reflection Loss   26.2% at 10 µm (2 surfaces)  
  dn/dT   +38.7 x 10-6/°C at 3.39µm  
  Index of Absorption   0.0006 cm-1 at 3.8 microns  
  Restrahlen Peak   30.5 microns  
PHYSICAL  
  Density   4.09 g/cm3  
  Melting Point   1765 °C (dissociates about 700°C)° C  
  Thermal Conductivity   27.2 Wm-1K-1 at 298K  
  Thermal Expansion   6.5 x 10-6/°C at 273K  
  Hardness   Knoop 160 with 50g indenter  
  Specific Heat Capacity   515 J/(kg K)  
  Dielectric Constant   8  
  Young's Modulus (E)   74.5 GPa  
  Apparent Elastic Limit   68.9 MPa (10,000psi)  
  Poisson Ratio   0.28  
CHEMICAL  
  Solubility   0.001 g/100g water  
  Molecular Weight   144.33  
  Class/Structure   HIP polycrystalline cubic, ZnS, F43m  

REFRACTIVE INDEX

  Wavelength, µm 0.405 0.436 0.468 0.480 0.509 0.546 0.588 0.644 0.668 0.706  
  Refractive Index od ZnS 2.545 2.489 2.449 2.437 2.413 2.388 2.368 2.347 2.340 2.331  
  Wavelength, µm 0.780 0.795 0.852 0.894 1.014 1.129 1.530 2.058 3.000 3.500  
  Refractive Index of Zinc Sulfide 2.317 2.314 2.306 2.302 2.292 2.285 2.272 2.264 2.258 2.255  
  Wavelength, µm 4.000 4.500 5.000 8.000 9.000 10.00 11.25 12.00 13.00    
  Refractive Index 2.252 2.250 2.247 2.223 2.213 2.201 2.183 2.171 2.153    



 
 
 
Blanks
Windows
Wedges
Plano-Convex Lenses
Bi-Concave Lenses

Ordering Info
 
  (c) Crystaltechno Ltd. Vernadskogo 113-106, Moscow 119571, Russia
+7 (495) 234-5951, 234-5952, 956-7610
fax +7 (495) 433-1551
sales@crystaltechno.com
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