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Proceedings Paper

Selection Of Optical Glasses
Author(s): Paul N. Robb
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Paper Abstract

A new method of selecting glass combinations for the correction of paraxial chromatic aberration in optical systems has been developed. This new method corrects axial color for at least three wavelengths using two different types of glass and at least four wavelengths using three different types of glass. Certain combinations can be found that are corrected for as many as five wavelengths, using either two or three different types of glass. The Abbe number and relative partial dispersions are not utilized in this new approach; instead, the dispersion of the glass is characterized using Buchdahl's chromatic coordinate. The Buchdahl model and the mathematical methods employed are described briefly. Thick air-spaced doublet and triplet lenses are presented as examples of designs that demonstrate color correction at three, four, and five wavelengths and are corrected for spherical aberration and spherochromatism as well. A more complex lens design is illustrated by a Petzval objective with a 24-in. focal length, a focal ratio of f/3.5, and a 12-deg field, which is corrected for both focal shift and spherochromatism and is diffraction-limited over the spectral region from 0.44 to 0.9 μm.

Paper Details

Date Published: 14 February 1986
PDF: 16 pages
Proc. SPIE 0554, 1985 International Lens Design Conference, (14 February 1986); doi: 10.1117/12.949195
Show Author Affiliations
Paul N. Robb, Lockheed Missiles & Space Company, Inc. (United States)

Published in SPIE Proceedings Vol. 0554:
1985 International Lens Design Conference
Duncan T. Moore; William H. Taylor, Editor(s)

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