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Optical novelty filters

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2 Author(s)
Anderson, D.Z. ; Dept. of Phys., Colorado Univ., Boulder, CO, USA ; Feinberg, J.

A novelty filter detects what is new in a scene and may be likened to a temporal high-pass filter. The current status of optical novelty filters and related devices, based upon four-wave mixing and two-beam coupling in photorefractive media, is reviewed. A detector that shows only what is not new, a monotony filter, may be likened to a temporal low-pass filter. Demonstrations of high- and low-pass and bandpass temporal image filters are then discussed. An analytical treatment of the two-beam coupling devices is given in a Laplace transform framework in the undepleted pump approximation assuming plane wave inputs. This allows a unified treatment of the various filter characteristics.<>

Published in:

Quantum Electronics, IEEE Journal of  (Volume:25 ,  Issue: 3 )