Single Optical Imaging Elements

Single Optical Imaging Elements
Author(s):    Max J. Riedl
Published:   2017
DOI:             10.1117/3.2272475
eISBN: 9781510610828
Description:

This Spotlight explores ways to address axial imaging limitations, i.e., spherical and chromatic aberrations. For the reduction of the additional, so-called primary aberrations, coma, astigmatism, field curvature, distortion, and chromatic aberration, more advanced methods have to be applied. In an extended field-covering system it is frequently necessary to balance the aberration contributions to avoid the predominance of one or more specific image spreads. Besides the most common lens with spherical surfaces, the benefits of an aspheric surface are discussed and demonstrated. Included in this coverage is the ball lens (total sphere) and the catadioptric Mangin mirror.

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The most common shape of a lens is a light-transmitting disc with at least one spherical surface. There is also the diffractive lens, usually called a diffractive optical element (DOE), which redirects light by diffraction. The third single element is the imaging mirror. A combination of the first two types is called a hybrid. This arrangement is used for chromatic aberration correction or thermal stabilization of the lens.

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