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Optics Letters

Optics Letters


  • 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)

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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

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

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)

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