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Zinc Sulfide Lenses

Zinc sulfide lens uses a single point diamond ultra-precision multi-axis free-form surface processing machine, through ultra-precision single point turning, grinding, measurement, ultra-precision polishing and other processes, under the condition of precise control of the machine tool and processing environment, achieving ultra-precision machining of the optical aspherical plastic domain. The use of ultra-precision correction polishing technology to polish the lens surface, achieving the optical aspherical surface accuracy≤0.1 micron, surface roughness Ra≤0.01 micron infrared aspherical lens.

infrared camera lens filter
infrared lens filter

Specifications of Zinc Sulfide Lenses


ZnS Zinc Sulfide Lenses product parameter table
ProjectIndicator requirements
1. MaterialZinc sulfide materials
2. DiameterOD≤150mm OD±0.025 or according to customer requirements
3. Center thicknessT±0.01 or according to customer requirements
4. Effective focal lengthaccording to customers needs
5. Working distanceaccording to customers needs
6. Effective apertureED>80% aspheric area
7. CoatingAR or Reflection or Metal coating R<0.5% @λnm
8. Surface shapeUltra-high precision Rt≤0.1μm, high precision Rt≤0.5μm, precision Rt≤1μm
9.Surface quality60-40, 40-20, 20-10


Features of Zinc Sulfide Lenses

Features of Zinc Sulfide Lenses
  • One-stop customized production: Solar Valley can process a variety of flat convex, double convex, convex and concave structure aspherical zinc sulfide lens according to customer requirements.The shape of zinc sulfide lens can be round, D-type, square and so on.

  • Material: Zinc sulfide has the characteristics of high purity, insoluble in water, moderate density, easy processing, etc., with good refractive index uniformity and consistency, high transmittance in the middle infrared band, with the shortening of wavelength, absorption and scattering enhancement.

  • Lens performance: Zinc sulfide (ZnS) is widely used in optical components of thermal imaging systems for infrared Windows and thermal bands (8 to 14μm), and its relatively high transmittance through 3-5µm and 8-10µm makes ZnS ideal for multispectral applications, widely used in the manufacture of infrared optical components such as infrared Windows, fairings and lenses.

    Product indicators:

    1. Maximum external dimension of circular zinc sulfide lens: OD≤φ150mm

    2. Maximum external dimension of square zinc sulfide lens: L×W ≤100×100mm

    3. Zinc sulfide lens can reach the following accuracy levels according to customer requirements:

    Ultra-high precision: surface shape error < 0.1μm, surface roughness < 0.01μm

    High precision grade: Surface error < 0.5μm, surface roughness < 0.05μm Precision grade: Surface error < 1μm, surface roughness < 0.1μm


  • Surface defect grade: 60-40, 40-20, 20-10 according to customer requirements.

  • Coating: According to customer requirements for coating, can provide no coating or a variety of broadband anti-reflection coating options.

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