Selection Of Optical Glasses

Paul N. Robb

doi:10.1117/12.949195

14 February 1986 Selection Of Optical Glasses

Paul N. Robb

Proceedings Volume 0554, 1985 International Lens Design Conference; (1986) https://doi.org/10.1117/12.949195
Event: 1985 International Lens Design Conference, 1985, Cherry Hill, United States

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.

Citation Download Citation

Paul N. Robb "Selection Of Optical Glasses", Proc. SPIE 0554, 1985 International Lens Design Conference, (14 February 1986); https://doi.org/10.1117/12.949195

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