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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 38, Iss. 8 — Mar. 10, 1999
  • pp: 1388–1392

Ring-Toric Lens for Focus-Error Sensing in Optical Data Storage

Michael R. Descour, Daniel I. Simon, and Wei-Hung Yeh  »View Author Affiliations


Applied Optics, Vol. 38, Issue 8, pp. 1388-1392 (1999)
http://dx.doi.org/10.1364/AO.38.001388


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Abstract

We discuss the design and performance of diffractive ring-toric lenses for focus-error sensing in optical data storage. A ring-toric lens images a point source of light to a ring-shaped image. Focus-error sensing is accomplished by means of monitoring the change in ring radius: The ring expands in response to a diverging wave front, and the ring contracts in response to a converging wave front. We describe the use of a segmented phi detector to generate a focus-error signal (FES). We found that the FES slope, a measure of sensitivity to disk defocus, is higher for the ring-toric lenses described in this paper than for other techniques such as the astigmatic and the obscuration methods. We measured an FES slope of 0.7 per micrometer of disk defocus (μm−1). The corresponding theoretical FES slope is 0.96 μm−1.

© 1999 Optical Society of America

OCIS Codes
(050.1220) Diffraction and gratings : Apertures
(050.1970) Diffraction and gratings : Diffractive optics
(210.0210) Optical data storage : Optical data storage
(220.2560) Optical design and fabrication : Propagating methods
(220.3630) Optical design and fabrication : Lenses

Citation
Michael R. Descour, Daniel I. Simon, and Wei-Hung Yeh, "Ring-Toric Lens for Focus-Error Sensing in Optical Data Storage," Appl. Opt. 38, 1388-1392 (1999)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-38-8-1388


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References

  1. M. Mansuripur and C. Pons, “Diffraction modeling of optical path for magneto-optical disk systems,” in Optical Storage Technology and Applications, D. B. Carlin, A. A. Jamberdino, and Y. Tsunda, eds., Proc. SPIE 899, 56–60 (1988).
  2. L. M. Soroko, Meso-Optics (World Scientific, Teaneck, N.J., 1996).
  3. Zemax lens-design software, Focus Software, Tucson, Arizona 85731 (1998).
  4. J. H. McLeod, “The axicon: a new type of optical element,” J. Opt. Soc. Am. 44, 592–597 (1954).
  5. J. B. Goodell, “Eccentric lenses for producing ring images,” Appl. Opt. 8, 2566 (1969).
  6. B. E. Bernacki and M. Mansuripur, “Diffraction analysis and evaluation of several focus- and track-error detection schemes for magneto-optical disk systems,” in Optical Data Storage, D. B. Carlin and D. B. Kay, eds., Proc. SPIE 1663, 150–156 (1992).
  7. J. J. Zambuto, R. E. Gerber, J. K. Erwin, and M. Mansuripur, “Ring-lens focusing and push–pull tracking scheme for optical disk systems,” Appl. Opt. 33, 7987–7994 (1994).
  8. W. C. Sweatt, “Condenser for illuminating a ring field,” U.S. Patent 5,361,292 (1 November 1994).
  9. B. Fritz, J. A. Cox, T. Werner, and J. Gieske, “Diffractive optic power monitor for use with a VCSEL source,” in Diffractive Optics and Micro-Optics, Vol. 10 of 1998 OSA Technical Digest Series (Optical Society of America, Washington, D.C., 1998), pp. 206–208.
  10. P.-A. Bélanger and M. Rioux, “Ring pattern of a lens-axicon doublet illuminated by a Gaussian beam,” Appl. Opt. 17, 1080–1086 (1978). In particular, see Fig. 5 in that article for out-of-focus ring irradiance profiles.
  11. P.-A. Bélanger and M. Rioux, “Diffraction ring pattern at the focal plane of a spherical lens-axicon doublet,” Can. J. Phys. 54, 1774–1780 (1976).
  12. The modeling of the ring-toric lens reported in this paper was performed by means of diffract, a product of MM Research Inc., Tucson, Ariz.
  13. J. Ojeda-Castañeda, “Foucault, wire, and phase modulation tests,” in Optical Shop Testing, D. Malacara, ed. (Wiley, New York, 1978), Chap. 8.
  14. M. Mansuripur, “Overview of optical data storage,” in The Physical Principles of Magneto-Optical Recording (Cambridge University, Cambridge, UK, 1995).
  15. D. I. Simon, M. R. Descour, and W.-H. Yeh, “Ring-toric optics for optical data-storage applications,” in Proceedings of the International Optical Design Conference, K. P. Thompson and L. R. Gardner, eds. (Optical Society of America, Washington, D.C., 1998), 209–210.

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