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Optics Letters

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  • Vol. 21, Iss. 13 — Jul. 1, 1996
  • pp: 919–921

Broadband behavior of an optical–digital focus-invariant system

Joseph van der Gracht, Edward R. Dowski, Jr., Merwyn G. Taylor, and Dawne M. Deaver  »View Author Affiliations


Optics Letters, Vol. 21, Issue 13, pp. 919-921 (1996)
http://dx.doi.org/10.1364/OL.21.000919


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Abstract

We present experimental evidence that demonstrates a greatly increased depth of field in a broadband-illuminated imaging system through the use of a special-purpose phase mask and digital filtering. The phase mask is of a simple rectangularly separable cubic-phase design, whereas the digital filtering used was a simple object-independent least-squares inverse filter. We demonstrate successful operation of the system over a range corresponding to 30 times the Hopkins criterion for allowable misfocus.

© 1996 Optical Society of America

History
Original Manuscript: January 29, 1996
Published: July 1, 1996

Citation
Joseph van der Gracht, Edward R. Dowski, Merwyn G. Taylor, and Dawne M. Deaver, "Broadband behavior of an optical–digital focus-invariant system," Opt. Lett. 21, 919-921 (1996)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-21-13-919


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References

  1. M. Mino, Y. Okano, Appl. Opt. 10, 2219 (1971). [CrossRef] [PubMed]
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  4. E. R. Dowski, W. T. Cathey, Appl. Opt. 34, 1859 (1995). [CrossRef] [PubMed]
  5. K. Brenner, A. Lohmann, J. Ojeda-Castaneda, Opt. Commun. 44, 323 (1983). [CrossRef]
  6. M. Born, E. Wolf, Principles of Optics (Pergamon, New York, 1989), pp. 747–754.
  7. J. van der Gracht, E. R. Dowski, W. T. Cathey, J. P. Bowen, Proc. SPIE 2537, 279 (1995). [CrossRef]

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