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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Vol. 43, Iss. 8 — Mar. 10, 2004
  • pp: 1695–1702

Optical correlation of spatial-frequency-shifted images in a photorefractive BSO correlator

Abtine Tavassoli and Michael F. Becker  »View Author Affiliations


Applied Optics, Vol. 43, Issue 8, pp. 1695-1702 (2004)
http://dx.doi.org/10.1364/AO.43.001695


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Abstract

The optical cross correlation of an image with another image that was spatial-frequency shifted in one dimension was demonstrated in a photorefractive VanderLugt correlator. The first image was stored as a Fourier-transform hologram in a photorefractive Bi12SiO20 crystal (BSO) and was successively correlated with different spatial-frequency-shifted versions of a second image. We implemented the spatial-frequency shift by rotating a galvanometer mirror in an image plane, causing the Fourier transform to be shifted laterally in the BSO. We verified that the resulting operation in the BSO was an accurate complex multiplication of the shifted and the stored Fourier transforms. As many as 20 successive readouts were conducted without measurable erasure of the stored hologram. The dynamic range, saturation behavior, and other performance parameters were measured and are discussed.

© 2004 Optical Society of America

OCIS Codes
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(070.4550) Fourier optics and signal processing : Correlators
(070.6020) Fourier optics and signal processing : Continuous optical signal processing
(160.5320) Materials : Photorefractive materials

History
Original Manuscript: November 18, 2003
Revised Manuscript: November 18, 2003
Published: March 10, 2004

Citation
Abtine Tavassoli and Michael F. Becker, "Optical correlation of spatial-frequency-shifted images in a photorefractive BSO correlator," Appl. Opt. 43, 1695-1702 (2004)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-43-8-1695

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