Spherical Doublet Lenses (Achromat)

Spherical Doublet lenses are transparent optical components consisting of two pieces of optical glass with surfaces so curved (usually spherical) that they serve to converge or diverge the transmitted rays from an object, thus forming a real or virtual image of that object.

Description

A special form of doublet lens is the achromatic lens. These consist of two elements, usually of crown and flint glass, such that the composite element has been corrected for chromatic aberration with respect to two selected wavelengths. In these lenses, chromatic, spherical and coma aberrations are considerably reduced. These components are designed with respect to three wavelengths: 480 nm, 546nm and 644nm. Use achromats to replace singlets where performance must be improved.

Specifications

Specification	Available Quality
Range of dimension	2mm – 200mm
Highest available surface figure	λ/10 (DIN: 3/0.2)
Highest available surface quality	20-10 S/D (DIN: 5/2×0.1)

In addition to our custom components, we offer a selection of standard lenses for prototyping and experimenting. Please see the “Download” tab for a list of available products.

Quality Assurance

We take quality control very seriously: we rely on accurate, widely recognized measurement systems for testing our optics. The following table indicates the accuracy of measurement for the most relevant parameters.

Surface figure: λ/20
Angle: 0,5 arcsec
Radius: 0,01%
Focal length: 0,03%-0,3%
Centration: +/-0,2µm or +/-2 arcsec
Wavelength: +/-0,3nm (190-1100nm)