Zinc Sulfide (ZnS)Plano-Concave 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) plano-concave lens is composed of a flat surface and a concave spherical surface, which can produce negative spherical aberration and is often used in systems where the light is expanded or the focal length is increased to balance the deviation of other lenses and is often widely used in laser systems and infrared systems, such as military reconnaissance, infrared thermal imager, LiDAR and laser guidance.

Our company can provide Zinc sulfide (ZnS) plano concave 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 Plano-Concave Lenses

Material properties of Zns

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%.

Typical size of Zns Plano-Concave Lenses