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Applied Optics

Applied Optics


  • Editor: Joseph N. Mait
  • Vol. 48, Iss. 28 — Oct. 1, 2009
  • pp: 5371–5379

Incoherently combining logarithmic aspheric lenses for extended depth of field

Kaiqin Chu, Nicholas George, and Wanli Chi  »View Author Affiliations

Applied Optics, Vol. 48, Issue 28, pp. 5371-5379 (2009)

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We describe a method for combining concentric logarithmic aspheric lenses in order to obtain an extended depth of field. Substantial improvement in extending the depth of field is obtained by carefully controlling the optical path difference among the concentric lenses so that their outputs combine incoherently. The system is analyzed through diffraction theory and the point spread function is shown to be highly invariant over a long range of object distances. After testing the image performance on a three-dimensional scene, we found that the incoherently combined logarithmic aspheres can provide a high-quality image over an axial distance corresponding to a defocus of ± 14 ( λ / 4 ) . Studies of the images of two-point objects are presented to illustrate the resolution of these lenses.

© 2009 Optical Society of America

OCIS Codes
(030.1670) Coherence and statistical optics : Coherent optical effects
(100.1830) Image processing : Deconvolution
(110.5220) Imaging systems : Photolithography
(220.1000) Optical design and fabrication : Aberration compensation
(260.1960) Physical optics : Diffraction theory
(350.4600) Other areas of optics : Optical engineering

ToC Category:
Optical Design and Fabrication

Original Manuscript: June 25, 2009
Revised Manuscript: September 1, 2009
Manuscript Accepted: September 1, 2009
Published: September 22, 2009

Kaiqin Chu, Nicholas George, and Wanli Chi, "Incoherently combining logarithmic aspheric lenses for extended depth of field," Appl. Opt. 48, 5371-5379 (2009)

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