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Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 12, Iss. 2 — Feb. 1, 1987
  • pp: 123–125

Optical tracking novelty filter

Dana Z. Anderson, Diana M. Lininger, and Jack Feinberg  »View Author Affiliations


Optics Letters, Vol. 12, Issue 2, pp. 123-125 (1987)
http://dx.doi.org/10.1364/OL.12.000123


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Abstract

We demonstrate an optical filter that displays the time-dependent features of a scene. The heart of the device is an interferometer that is sensitive not to the difference between two optical paths lengths but to changes in the path-length difference. The interferometer arms share a phase-conjugating mirror. The phase conjugator ensures that, at steady state, the output of the interferometer is dark. The response of the interferometer to a step differential change in the optical lengths is a decaying exponential having a time constant governed by the time response of the phase conjugator. The interferometer may be used to monitor time- and space-dependent optical phase changes that are due, for example, to transparent fluid motion. With a modified liquid-crystal television used as a spatial light phase modulator in the interferometer, we detect time-dependent features of an image viewed by a video camera.

© 1987 Optical Society of America

History
Original Manuscript: September 8, 1986
Manuscript Accepted: October 14, 1986
Published: February 1, 1987

Citation
Dana Z. Anderson, Jack Feinberg, and Diana M. Lininger, "Optical tracking novelty filter," Opt. Lett. 12, 123-125 (1987)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-12-2-123


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References

  1. T. Kohonen, Self-Organization and Associative Memory (Springer-Verlag, New York, 1984), Chap. 4.
  2. A. Hodges, Alan Turing: The Enigma (Simon & Schuster, New York, 1983), p. 315.
  3. M. D. Ewbank, P. Yeh, M. Khoshnevisan, J. Feinberg, Opt. Lett. 10, 282 (1985). [CrossRef] [PubMed]
  4. An interferometer arrangement similar to ours has been used to perform real-time image subtraction. See S. Kwong, G. A. Rakuljic, A. Yariv, Appl. Phys. Lett. 48, 201 (1986); see also A. E. Chiou, P. Yeh, Opt. Lett. 11, 306 (1986). [CrossRef] [PubMed]
  5. R. A. Fisher, ed., Optical Phase Conjugation (Academic, New York, 1983).
  6. J. Feinberg, Opt. Lett. 7, 486 (1982). [CrossRef] [PubMed]
  7. I. McMichael, M. Khoshnevisan, P. Yeh, Opt. Lett. 11, 525 (1986). [CrossRef] [PubMed]

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