SCHOTT North America

Polished Aspherical Lenses

Product Information

Aspherical lenses have a complex surface profile – it is neither spherical nor cylindrical. They are produced by CNC-machining and MRF-tooling usually for smaller quantities and prototypes.
Due to the unique surface profile, high performance aspherical lenses used in optical elements eliminate monochromatic aberrations (e.g. spherical aberration) and lead to a better overall image quality. They are increasingly used to replace a multi- spherical element assembly, thereby combining weight reduction and allowing for a more compact design.

Benefits

There are 2 key advantages associated with the use of aspherical elements. First, an improvement in the quality of the complete lens system. Second, an overall reduction in the weight and size of the final product.

Other benefits include:

Higher level of achievable transmission due to a reduction in the number of back reflections
Reduction in the temperature increase in the case of several KW-light transmissions
Decrease in the level of subsurface damage due to MRF (Magneto-Rheological Frequency) polishing
Fine polishing of spherical shapes (improvement from λ to λ /10)
Improved collimating accuracy

Key Applications

Aspheric lenses can be used in a variety of applications, such as in high power laser collimators and for focusing optics for head-up-displays.

Materials Used

All types of optical materials can be used:

Optical glass
ZERODUR^® glass ceramic
Fused silica LITHOSIL^®
Other Materials: On request

Forms of Supply

Lens diameter: 10 – 200 mm

Specifications

Local polishing by MRF polishing
Convex radii from 20 mm to ∞
Aperture angle up to 180°
Concave radii: on request
Form precision: up to 0.2 µm p-v
Tangential error: 0.2 mrad / mm
Surface roughness: < 1 nm Rq

Quality Assurance

Our quality control is based on self-checking during production and 100% final inspection. Measuring instruments used include 2D profile measuring and holographic interferometer measuring.

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Contact

SCHOTT North America, Inc.

400 York Avenue
Duryea, 18642
USA

570-457-7485

570-457-7330

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