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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Glenn D. Boreman
  • Vol. 44, Iss. 34 — Dec. 1, 2005
  • pp: 7307–7312

Finite conjugate spherical aberration compensation in high numerical-aperture optical disc readout

Sjoerd Stallinga  »View Author Affiliations


Applied Optics, Vol. 44, Issue 34, pp. 7307-7312 (2005)
http://dx.doi.org/10.1364/AO.44.007307


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Abstract

Spherical aberration arising from deviations of the thickness of an optical disc substrate from a nominal value can be compensated to a great extent by illuminating the scanning objective lens with a slightly convergent or divergent beam. The optimum conjugate change and the amount and type of residual aberration are calculated analytically for an objective lens that satisfies Abbe's sine condition. The aberration sensitivity is decreased by a factor of 25 for numerical aperture values of approximately 0.85, and the residual aberrations consist mainly of the first higher-order Zernike spherical aberration term A60. The Wasserman-Wolf-Vaskas method is used to design biaspheric objective lenses that satisfy a ray condition that interpolates between the Abbe and the Herschel conditions. Requirements for coma by field use allow for only small deviations from the Abbe condition, making the analytical theory a good approximation for any objective lens used in practice.

© 2005 Optical Society of America

OCIS Codes
(080.1010) Geometric optics : Aberrations (global)
(210.4590) Optical data storage : Optical disks

ToC Category:
Optical Data Storage

Citation
Sjoerd Stallinga, "Finite conjugate spherical aberration compensation in high numerical-aperture optical disc readout," Appl. Opt. 44, 7307-7312 (2005)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-44-34-7307

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