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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 4 — Feb. 20, 2006
  • pp: 1451–1457

All-optical spatial filtering with power limiting materials

Chandra S. Yelleswarapu, Pengfei Wu, Sri-Rajasekhar Kothapalli, D. V. G. L. N. Rao, Brian R. Kimball, S. Siva Sankara Sai, R. Gowrishankar, and S. Sivaramakrishnan  »View Author Affiliations


Optics Express, Vol. 14, Issue 4, pp. 1451-1457 (2006)
http://dx.doi.org/10.1364/OE.14.001451


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Abstract

We demonstrated that a power limiting mechanism could potentially be used for self-adaptive, all-optical Fourier image processing. Reverse saturable absorbers like porphyrins are chosen due to their fluence dependent power limiting property, which triggers at relatively low intensities. At low input intensities, below the power-limiting threshold, the 4-f configuration will image the object onto the CCD camera without any spatial frequency filtering. As the input intensity is increased above the threshold level, dc and low spatial frequencies are blocked resulting in edge-enhanced images containing high spatial frequencies. The incident intensity sets the higher limit on the band of frequencies blocked. In addition, the use of the same experimental setup for both power limiting experiments and optical image processing demonstrates that in the case of any bright image bearing laser beam, the sensitive detectors are protected, by blocking the intense low spatial frequencies.

© 2006 Optical Society of America

OCIS Codes
(070.6110) Fourier optics and signal processing : Spatial filtering
(100.1160) Image processing : Analog optical image processing
(140.3330) Lasers and laser optics : Laser damage
(230.4320) Optical devices : Nonlinear optical devices

ToC Category:
Fourier Optics and Optical Signal Processing

History
Original Manuscript: July 14, 2005
Revised Manuscript: January 30, 2006
Manuscript Accepted: February 1, 2006
Published: February 20, 2006

Virtual Issues
Vol. 1, Iss. 3 Virtual Journal for Biomedical Optics

Citation
Chandra Yelleswarapu, Pengfei Wu, Sri-Rajasekhar Kothapalli, D. V. G. L. N. Rao, Brian Kimball, S. Siva Sankara Sai, R. Gowrishankar, and S. Sivaramakrishnan, "All-optical spatial filtering with power limiting materials," Opt. Express 14, 1451-1457 (2006)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-14-4-1451


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