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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 29, Iss. 29 — Oct. 10, 1990
  • pp: 4408–4413

Amplitude detection for the focus error in optical disks using a birefringent lens

Klaus Kinnstatter, Masahiro Ojima, and Seiji Yonezawa  »View Author Affiliations


Applied Optics, Vol. 29, Issue 29, pp. 4408-4413 (1990)
http://dx.doi.org/10.1364/AO.29.004408


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Abstract

A lens made of a birefringent material shows two focal points. If the polarization of incident light is switched periodically and a detector is placed between the two focal points, this property can be utilized to detect a focus error signal equivalent to that of a dual detection optics. The proposed system offers the possibility to achieve amplitude detection for the focus error. It results in a compact optical pickup with reduced adjustment requirements. A second possible pickup uses a birefringent lens and a Wollaston prism. In this case, a compact dual detection method is achieved.

© 1990 Optical Society of America

History
Original Manuscript: October 17, 1989
Published: October 10, 1990

Citation
Klaus Kinnstatter, Masahiro Ojima, and Seiji Yonezawa, "Amplitude detection for the focus error in optical disks using a birefringent lens," Appl. Opt. 29, 4408-4413 (1990)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-29-29-4408


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References

  1. Y. Tsunoda, T. Kaku, S. Nakamura, T. Maeda, “On-Land Composite Pregroove Method for High Track Density Recording,” Proc. Soc. Photo-Opt. Instrum. Eng. 695, 224–229 (1986).
  2. S. Yonezawa et al., “Method and Apparatus for Recording and Reproducing a Video-Disk with an Oscillated Track,” U.S. Patent4,223,187.
  3. G. Bouwhuis et al., Principles of Optical Disc Systems (Adam Hilger, Bristol, 1985), p. 75.
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  8. M. Born, E. Wolf, Principles of Optics (Pergamon, New York, 1970) Chap. 14.
  9. We assume in the following a crystal which shows positive birefringence, i.e., ne > no (and therefore also fe < fo). If a crystal showing negative birefringence is used, indices e and o have to be exchanged in all the formulas to find the correct results.
  10. M. Ojima, N. Ohta, “Erasable Optical Disk Technologies,” Hitachi Rev. 37 (1988).
  11. Because a birefringent material has two refractive indices, a lens made of a birefringent material shows two spherical aberrations. Similarly, because a birefringent material has two dispersion relations, a lens made of a birefringent material shows two different chromatic aberrations. In general, it is impossible to correct the aberrations for both indices; only a correction of the mean value is possible.
  12. Y. Matsuhashi, T. Morikawa, A. Seko, K. Sakurai, J. Shimada, “Self Coupled Optical Pick-Up,” Opt. Commun. 17, 95 (1976). [CrossRef]

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