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. 1999 Sep 1;38(25):5355-64.
doi: 10.1364/ao.38.005355.

Interferometric chromatic dispersion measurements of long, gradient-index rod lenses in the visible and the near infrared

T H Tomkinson  1 , D T Moore
Affiliations

Interferometric chromatic dispersion measurements of long, gradient-index rod lenses in the visible and the near infrared

T H Tomkinson et al. Appl Opt. .

Abstract

A new procedure is presented for testing long, radial-gradient-index rod lenses in a phase-stepping Twyman-Green interferometer. In addition, a method for converting the measured optical phase data to the rod's index of refraction profile is reviewed. This procedure was used to measure refractive-index profile dispersions over the wavelength range of 441 to 1064 nm. These measurements provide the first data for refractive-index profiles of rod lenses in the infrared and show the existence of positive dispersion, negative dispersion, and near-infrared dispersion reversal in some samples. The dispersion results suggest the need for modifications to the current glass model.

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