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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 37, Iss. 23 — Aug. 10, 1998
  • pp: 5394–5398

Pattern generation with an extended focal depth

Rafael Piestun, Boris Spektor, and Joseph Shamir  »View Author Affiliations


Applied Optics, Vol. 37, Issue 23, pp. 5394-5398 (1998)
http://dx.doi.org/10.1364/AO.37.005394


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Abstract

The depth of focus of light patterns can be extended, within given tolerances, beyond the classical limits. For a quantitative evaluation we introduce a degree of depth-of-focus extension and a three-dimensional energy-distribution efficiency. The basic limitations involved in depth-of-focus extension are discussed. A coherent system in which the input is optimized for a desired output pattern is presented. An example of a pattern containing diffraction-limited line segments and a 4 times improvement in depth of focus is demonstrated. This task is much more difficult than generating patterns of isolated light spots in which the depth of focus is extended beyond an order of magnitude.

© 1998 Optical Society of America

OCIS Codes
(050.1970) Diffraction and gratings : Diffractive optics
(100.5090) Image processing : Phase-only filters
(140.3300) Lasers and laser optics : Laser beam shaping

History
Original Manuscript: March 11, 1998
Revised Manuscript: April 20, 1998
Published: August 10, 1998

Citation
Rafael Piestun, Boris Spektor, and Joseph Shamir, "Pattern generation with an extended focal depth," Appl. Opt. 37, 5394-5398 (1998)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-37-23-5394


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References

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