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An Electron Optical Achromat

Published online by Cambridge University Press:  14 March 2018

Stephen W. Carmichael
Stephen W. Carmichael*
Affiliation:
Mayo Clinic

Extract

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Spherical and chromatic aberrations have been the bane of optical lenses ever since they were first ground from a piece of glass. As light travels through a convex (converging) lens, the rays at the center of the optical axis are refracted (bent) less than the peripheral rays, so that the central rays are focused behind the peripheral rays. This is the essence of spherical aberration. Light of differing wavelengths (colors) interact differently with the lens so that longer wavelengths (red) are focused behind shorter wavelengths (blue). This is chromatic aberration. In the early days of light microscopy, these two inherent flaws seriously limited the quality of images.

Type
Research Article
Information
Microscopy Today , Volume 5 , Issue 6 , August 1997 , pp. 3 - 5
Copyright
Copyright © Microscopy Society of America 1997

References

Note

2 Rempfer, GF, Desloge, DM, Skoczylas, WP and Griffith, OH Simultaneous correction of spherical and chromalic aberralions wrtti an eietlron mtrror. An electron optical achromal Microscopy and Microanalysis 3 14–27 1997 Google Scholar.