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Applied Optics

Applied Optics


  • Vol. 39, Iss. 22 — Aug. 1, 2000
  • pp: 4013–4020

Alteration of imaging properties of an optical pickup’s objective lens by a nonrotationally symmetric coating

Kai Man Hung  »View Author Affiliations

Applied Optics, Vol. 39, Issue 22, pp. 4013-4020 (2000)

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One can control the aberrations of an optical readout system by varying the width of a strip of antireflection coatings deposited upon plastic objective lenses. It is found that one can control the magnitude of the third-order astigmatism of the system by changing the coating width. This process has the advantage that it does not significantly cause other kinds of aberration such as coma and spherical aberrations to deteriorate. When these nonrotational symmetrically (NRS) coated lenses are used for off-axis operations such as tracking movements in optical drives, the change in the magnitude of the astigmatism (ΔAS) that is generated can be made smaller than those of symmetrically coated or noncoated lenses. As much as a 73% decrease in ΔAS was observed experimentally with a NRS-coated lens. Including the birefringence of the plastic material in the analysis yields a low and constant level of astigmatism generated by shifting of the objective lens.

© 2000 Optical Society of America

OCIS Codes
(220.1250) Optical design and fabrication : Aspherics
(220.3630) Optical design and fabrication : Lenses
(310.1620) Thin films : Interference coatings

Original Manuscript: November 2, 1999
Revised Manuscript: April 12, 2000
Published: August 1, 2000

Kai Man Hung, "Alteration of imaging properties of an optical pickup’s objective lens by a nonrotationally symmetric coating," Appl. Opt. 39, 4013-4020 (2000)

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  1. H. Kawai, M. Suzuki, A. Yoshida, “Birefringence-free acrylic resin for precision plastic optics,” in Precision Plastic Optics for Optical Storage, Displays, Imaging, and Communications, F. W. Frank, ed., Proc. SPIE3135, 42–51 (1997). [CrossRef]
  2. H. Yamazaki, T. Matsumaru, “Device for recording or reproducing information on an optical recording medium having an objective lens with an astigmatism producing off optical axis minimum total astigmatism position to correct tracking astigmatism,” U.S. patent5,754,504 (19May1998).
  3. K. M. Hung, “Effects of asymmetrically molded plastic objective lens on the push–pull tracking error signal in an optical disk drive,” Appl. Opt. 39, 1309–1314 (2000). [CrossRef]
  4. G. H. Meeten, Optical Properties of Polymers (Elsevier, Barking, UK, 1986).

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