PRODUCTS & SERVICES

PRODUCTS & SERVICES

ZnS lenses & windows

2020-06-24

Zinc Sulfide (ZnS) is an infrared transmitting material with homogeneity of refractive index. It has excellent performance in image transmission between 8-12μm, and has high transmission performance in infrared band. But absorb and dispersion will enhance when the wavelength get short. 

The Zinc Sulfide Delfa use is a sort of inert material which is insoluble in water. Due to its high purity, moderate density and easy to be processed, Zinc Sulfide is widely used in infrared windows, domes and other infrared components.

Optical properties: 

Symbol     

ZnS

Crystal structure

Cubic

Melting Point ()   

1830

Density (g/cm3)

4.09

Thermal Expansion Coefficient (10-6, -1

7.85


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 Specifications:

ZnS lenses:

Diameter tolerance   

Up to +0/-0.01mm

Central thickness tolerance

Up to +/-0.01mm

Surface figure  

Up to λ/10 @632.8nm

Centration

Up to 5 arc seconds

ETV

≤0.05mm

Surface quality

Up to 10-5 Scratch & Digs

Clear aperture

Up to 100% of the diameter

Bevel

<0.2mmx45°

Coating

According to your request


ZnS windows:

Thickness tolerance  

Up to +/-0.01mm

Surface figure  

Up to λ/20 @632.8nm

Parallelism

Up to 0.5 arc seconds

Surface quality

Up to 10-5 Scratch & Digs

Bevel

<0.2mmx45°

Coating

According to your request


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