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 |
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 |
