Zns meniscus lens

Zinc Sulfide (ZnS)Meniscus Lenses

Zinc sulfide (ZnS) is a broad-band (3.72 eV) group II-VI semiconductor material with high optical transmittance in the near-infrared (1-3 μm), mid-infrared (3-5 μm), far-infrared (8-12 μm) and other spectral bands, with moderate mechanical properties, thermal properties and chemical stability, and is an important class of optoelectronic functional materials. The multi-spectral band transmittance ZnS materials are widely used in infrared optics and other fields.

Zinc sulfide (ZnS) double convex lens with convex on one side and concave on the other. It can be a converging lens or a diverging lens, determined by a combination of refractive index, curvature and radius,And it’s often widely used in optical systems, such as projectors, liDAR, optical sensors and other devices.

Our company can provide Zinc sulfide (ZnS)Meniscus lens with diameters from 2-300mm.and thicknesses from 0.12-60mm (accuracy up to 20-10, 1/10L@633nm),coating AR, BBAR, AF or upon request.

 

Technical parameters of Zns Meniscus Lens

Diameter

2-300mm

Focal length

15-5000mm

Thicknesses

0.12-60mm

Dimension tolerance

+0/-0.1mm

Thickness tolerance

±0.1mm

Surface quality (scratch &   dig)

60-40, 40-20, or better

Surface accuracy

λ/2, λ/4 or better

Parallelism

3' ,30''

Bevel

0.1~0.3mm x 45 degree

Clear aperture

>85%,>90%

Coating

AR coating or cutom


Material properties of Zns

Physical   PropertiesCVD ZnsMultispectral   CVD Zns
Density[g/cm3]4.094.09
Resistivity[Ω.cm]~1012~101.3
Melting Point []1827
Chemical purity[%]99.999699.9996
Thermal Expansion [1/K]6.6*10-6@273k6.3*10-6@273k 
7.3*10-6@373k 7.0*10-6@373k
ThermalConductivity [J/k.m.s]16.7@298k27.2@298k
Specific Heat Capacity [J/g.K]0.469@298k0.515@298k
Knoop Hardness [kg/mm2]200-235160
Bending strength [Mpa]103
Young's Modulus [GPa]74.574.5
Poisson's coefficient0.290.29



Optical PropertiesCVD   ZnsMultispectral   CVD Zns
ransmission Range1-14μm0.37-14μm
Refractive index inhomogeneity[n/n]<7.3*10-4@10.6μm<0.2*10-4@632.8nm
Absorption coefficient0.2@10.6μm0.2@10.6μm
[1/cm]
Thermal light coefficient4.6*10-5@1150nm5.43*10-5@632.8nm 
[1/k,298-358k]4.3*10-5@3390nm4.21*10-5@1150nm

4.1*10-5@10.6μm3.87*10-5@3390nm


Transmission curve


The transmission curve of standard CVD zinc sulfide, at (20±3)℃ temperature, is shown in the figure. The transmission in the spectral range from 8μm to 10μm should not be less than 70%; The transmission curve in the spectral range from 3μm to 10μm should not have other absorption peaks except for the absorption peak near 6μm. 

The transmission curves of the multispectral CVD zinc sulfide at (20±3)℃ are shown in Fig. The transmittance at 1064 nm is not less than 70%, and the transmittance in the spectral range from 3 μm to 5 μm is not less than69%, and the transmittance curve is smooth without absorption peak; The transmittance  in the spectral range from 8 μm to 10 μm is not less than 70%.


 

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