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Applied Optics

Applied Optics


  • Vol. 34, Iss. 11 — Apr. 10, 1995
  • pp: 1859–1866

Extended depth of field through wave-front coding

Edward R. Dowski, Jr. and W. Thomas Cathey  »View Author Affiliations

Applied Optics, Vol. 34, Issue 11, pp. 1859-1866 (1995)

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We designed an optical–digital system that delivers near-diffraction-limited imaging performance with a large depth of field. This system is the standard incoherent optical system modified by a phase mask with digital processing of the resulting intermediate image. The phase mask alters or codes the received incoherent wave front in such a way that the point-spread function and the optical transfer function do not change appreciably as a function of misfocus. Focus-independent digital filtering of the intermediate image is used to produce a combined optical–digital system that has a nearly diffraction limited point-spread function. This high-resolution extended depth of field is obtained through the expense of an increased dynamic range of the incoherent system. We use both the ambiguity function and the stationary-phase method to design these phase masks.

© 1995 Optical Society of America

Original Manuscript: September 12, 1994
Revised Manuscript: December 5, 1994
Published: April 10, 1995

Edward R. Dowski and W. Thomas Cathey, "Extended depth of field through wave-front coding," Appl. Opt. 34, 1859-1866 (1995)

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