Effects of axial and radial gradients on Cooke triplets

C. Gary Blough, John P. Bowen, Niels Haun, Douglas S. Kindred, R. John Koshel, Daniel M. Krill, Duncan T. Moore, Christopher E. Saxer, David Y.H. Wang

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


This study investigates the role of gradient-index materials in the design of Cooke triplets for use as 35-mm format photographic objectives. Cooke triplet designs are presented with different types of gradient-index profiles. Both linear axial and shallow radial gradients are shown to provide effective control of spherical aberration and astigmatism. In particular, a Cooke triplet with a combination of both linear axial and radial gradients attains performance comparable to a six-element double Gauss lens. In virtually all cases, the use of gradient-index components improves the Cooke triplets’ performance significantly.

Original languageEnglish (US)
Pages (from-to)4008-4015
Number of pages8
JournalApplied optics
Issue number28
StatePublished - Oct 1990

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering


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