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21 September 1998 Ring-toric optics in optical data storage applications
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Proceedings Volume 3482, International Optical Design Conference 1998; (1998)
Event: International Optical Design Conference, 1998, Kona, HI, United States
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.
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Daniel I. Simon, Michael R. Descour, and Wei-Hung Yei "Ring-toric optics in optical data storage applications", Proc. SPIE 3482, International Optical Design Conference 1998, (21 September 1998);

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