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Applied Optics

Applied Optics


  • Vol. 40, Iss. 31 — Nov. 1, 2001
  • pp: 5658–5662

High focal depth with a pure-phase apodizer

Haifeng Wang and Fuxi Gan  »View Author Affiliations

Applied Optics, Vol. 40, Issue 31, pp. 5658-5662 (2001)

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High-density optical data storage requires high-numerical-aperture (NA) lenses and short wavelengths. But, with increasing NA and decreasing wavelength, the depth of focus (DOF) decreases rapidly. We propose to use pure-phase superresolution apodizers to optimize the axial intensity distribution and extend the DOF of an optical pickup. With this kind of apodizer, the expected DOF can be 2–4.88 times greater than that of the original system, and the spot size will be smaller than that of the original system.

© 2001 Optical Society of America

OCIS Codes
(050.1380) Diffraction and gratings : Binary optics
(050.1970) Diffraction and gratings : Diffractive optics
(050.5080) Diffraction and gratings : Phase shift
(210.4770) Optical data storage : Optical recording
(220.1230) Optical design and fabrication : Apodization
(220.2560) Optical design and fabrication : Propagating methods

Original Manuscript: September 8, 2000
Revised Manuscript: April 4, 2001
Published: November 1, 2001

Haifeng Wang and Fuxi Gan, "High focal depth with a pure-phase apodizer," Appl. Opt. 40, 5658-5662 (2001)

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