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ZnS Optics

Standard ZnS (Zinc Sulphide) made by CVD (Chemical Vapor Deposition) technique method to obtain high transmittance, CVD ZnS is polycrystalline material, it is excellent windows and domes material for long-wave infrared imaging system for military applications or other harsh environments, due to its high transmission, good optical uniformity, exceptional fracture strength, hardness, and chemical inactivity. CVD ZnS is chemically inert, highly pure, theoretically dense and easily machined. Zinc sulfide displays a high level of the index of refraction homogeneity and offers imaging uniformity across the 3-12 micron waveband. With good optical properties and excellent mechanical properties, CVD ZnS has been used successfully in many military applications requiring mechanical resistance to hostile environments.

Multispectral ZnS is made from Standard ZnS by a post-deposition hot isostatic (HIP) process. This process spreads the transmission band from 0.4 to 12 microns, thus makes the material clear like water with minimal scatter and absorption. Multispectral ZnS showing excellent transmission across the visible to long-wave infrared waveband is well-suited for the applications that require a single aperture for beam path for several wavebands. Honour Optics is the professional customized plano/spherical/aspherical/cylindrical ZnS optics and Multispectral/Cleartran and standard CVD ZnS optics manufacturer, welcome to consult the price of wholesale ZnS optics.

High precision ZnS optics is comparatively soft cubic crystal in manufacturing, meaning it is easy to leave scratches in grinding and polishing processes, which lead to complicated quality control of both cosmetic and surface accuracy. Honour Optics with many years’ experience of ZnS fabrication, this enables  Honour Optics to meet customers’ expectation without compromise. Welcome everyone to purchase large size ZnS optics.

Honour Optics also offers HP

(Hot-pressed) Polycrystalline Zinc Sulphide is a kind of infrared optical material with a wide transmittance range.
It is prepared from highly pure zinc sulfide raw material under vacuum and high-temperature condition.
It possesses good infrared transmission and thermal property and high impact overloading resistance. Since it can be directly pressed into large size plates and spherical windows with various curvature radiuses, it has been extensively used in the infrared detector windows with various sizes. Besides, this product is still a kind of good coating material.
At present Honour offers dome less than Dia. 270mm x 85mm x 10mm, and Plate less than Dia.360mm x 15mm. Working well at 3-5um and 7.5-10.5um.

High precision ZnS optics exhibits high strength and hardness, and good resistance to hostile environments.
It is about one-third harder than Cleartran and about twice as hard as ZnSe.
It does not transmit well in the visible spectral region.
It has the relatively low cost of about two thirds the price of Cleartran or ZnSe.
ZnSe is diamond turnable.

Products manufactured: Lenses, Aspheric lenses, Windows, Domes, Wedges
Surface finish: Typical specifications for surface quality in the 3-12μm spectral region are 60-40, scratch-dig depending upon system performance requirements.
Surface figure: In the infrared, typical surface figure ranges from 1/2 wave to 2 waves @0.6328 μm depending on the system performance requirements.

AR coating options: Typically available coatings for ZnS include BBAR for the 0.8-2.5μm and 0.4-12um (Multispectral ZnS), 3 to 5μm and the 8 to 12μm regions. Many other specialized wavelength bands are possible within the 3 to 12μm spectral range. Honour Optics is the professional customized plano/spherical/aspherical/cylindrical ZnS optics and Multispectral/Cleartran and standard CVD ZnS optics manufacturer, welcome to consult the price of wholesale ZnS optics.

Tab. 1.Properties

Specifications of ZnS

Transmission Range 0.37 to 13.5μm
Refractive Index 2.20084 at 10mμm
Reflection Loss 0.0006 cm-1 at 3.8μm
Restrahlen Peak 30.5μm
dn/dT +38.7 x 10-6/°C at 3.39μm
Density 4.09g/cm3
Melting Point 1827°C (dissociates about 700°C)
Thermal Conductivity 27.2 W/(m K) at 298K
Thermal Expansion 6.5 x 10-6/ °C at 273K
Hardness Knoop 160 with 50g indenter
Specific Heat Capacity 515 J · kg-1 · K-1
Dielectric Constant 8
Young's Modulus (E) 74.5 GPa
Apparent Elastic Limit 68.9 MPa (10,000psi)
Poisson Ratio 0.28

Tab. 2.ZnS Refractive Index

λ, μm n
IR-ZnS MS-ZnS
0.5 2.4190 2.4130
0.5461 2.3910 2.3884
0.7 2.3320 2.3310
1.0 2.2920 2.2916
3.0 2.2570 2.2577
4.0 2.2520 2.2523
5.0 2.2460 2.2466
8.0 2.2233 2.2233
9.0 2.2120 2.2129
10.0 2.2005 2.2008
11.8 2.1730 2.1730
12.0 2.1710 2.1710
13.0 2.1525 2.1525

Tab. 3.Specification of ZnS optis

Specification Typical Level High precision
Sizes 2mm-200mm 2mm-200mm
Diameter tolerance +/-0.1mm +/-0.05mm
Thickness tolerance +/-0.1mm +/-0.05mm
Surface quality, scr/dig 60/40 10/5
Surface flatness(lambda) L/2 L/10
Parallelism 3 arc min 30 arc sec
Clear Aperture 80% 90%
Chamfer 0.25mm at 45 deg 0.15mm at 45 deg
Coating As requested As requested

Transmission Spectrum

high precision ZnS optics transmission spectrum

ZnS is widely utilized in multi-spectral IR applications. Its relatively high transmittance through 3-5µm and 8-10µm enable ZnS being an ideal choice for multi-spectral applications. Further, within NIR and SWIR range, CVD ZnS can also be considered as an indispensable alternative for optical designers. Welcome everyone to purchase large size ZnS optics.

Honour Optics offers ZnS optics with AR coating according to customer need. Our ZnS optics are especially suitable for systems that involve a visible camera, mid-wave and long-wave detectors, and further laser rangefinders to designate targets. Our ZnS windows also can be used for external windows for particular sensor applications.

Honour Optics is the professional manufacturer of ZnS with ROHS environmental protection requirements. Honour Optics produces both CVD ZnS and multispectral ZnS (MS-ZnS, also called water-clear grade).