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Proceedings Paper

Ring-toric optics in optical data storage applications
Author(s): Daniel I. Simon; Michael R. Descour; Wei-Hung Yei
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Paper Abstract

We review the relatively short history of the ring-toric lenslet. We discuss ring-toric lenslet design and elements that we have fabricated. We illustrate how a focus-error signal (FES) is measured with a ring-toric lens. We have found that the FES slope. a measure of sensitivity to defocus, is higher for the ring-toric lenslets described in this paper than for other techniques, such as the astigmatic and obscuration methods. We measured an FES slope of 0.63 per micron of defocus. The theoretical FES slope is 1.4 micrometers -1. Finally, we describe a multi-level DOE fabricated in a single etch using grayscale-photomask technology.

Paper Details

Date Published: 21 September 1998
PDF: 6 pages
Proc. SPIE 3482, International Optical Design Conference 1998, (21 September 1998); doi: 10.1117/12.322050
Show Author Affiliations
Daniel I. Simon, Optical Sciences Ctr./Univ. of Arizona (United States)
Michael R. Descour, Optical Sciences Ctr./Univ. of Arizona (United States)
Wei-Hung Yei, Optical Sciences Ctr./Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 3482:
International Optical Design Conference 1998
Leo R. Gardner; Kevin P. Thompson, Editor(s)

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