aspheric surface

aspheric surface

(ay-sfe -rik) Any surface that does not form part of a sphere. A paraboloid reflector, used in both optical and radio telescopes, is aspheric. Although production costs are high, aspheric surfaces can greatly improve lens and mirror performance.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

aspheric surface

[ā′sfir·ik ′sər·fəs]
(optics)
A lens or mirror surface which is altered slightly from a spherical surface in order to reduce aberrations.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The structure of the lighting unit only consists of a spherical reflector and a primary lens which comprises an aspheric surface and a spherical surface.
The optic zone diameter is 6.15 mm and incorporates a diffractive aspheric front surface and a posterior aspheric surface with a negative spherical aberration of -0.11 microns for a 6.0 mm pupil diameter.
The experimental results showed that the two-axis UV polishing could polish the aspheric surface roughness of a tungsten carbide mold to Rz 8 nm.
The retinal image size is reduced due to the aspheric surface and flatter base curve; care must be taken to order both lenses from the same manufacturer to ensure that any MAR coatings or tints match.
In paper [7], an improved phase retrieval algorithm is proposed to overcome the measurement and calculation difficulty for aspheric surface.
Lenses are limited by the inherent diffraction efficiency of the aspheric surface, so they yield a lower overall transmission than comparable aspherized achromats.
The biggest challenge I faced making this scope was ensuring that the secondary's aspheric surface was a smooth figure of revolution.
Roberts, "Characterization of the inherent error in a spherically-biased corneal topography system in mapping a radially aspheric surface," Journal of refractive and corneal surgery, vol.
The human cornea is neither a true spherical, nor a true toric surface, but is a relatively complex aspheric surface with the degree of asphericity varying in each of the principle meridians.