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, S. Sivaramakrishnan

Research output: Contribution to journalArticle

13 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)1451-1457
Number of pages7
JournalOptics Express
Volume14
Issue number4
DOIs
StatePublished - Jan 1 2006

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spatial filtering
image processing
thresholds
CCD cameras
porphyrins
absorbers
fluence
actuators
laser beams
detectors
configurations

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

Cite this

Yelleswarapu, C. S., Wu, P., Kothapalli, S-R., Rao, D. V. G. L. N., Kimball, B. R., Sai, S. S. S., ... Sivaramakrishnan, S. (2006). All-optical spatial filtering with power limiting materials. Optics Express, 14(4), 1451-1457. https://doi.org/10.1364/OE.14.001451
Yelleswarapu, Chandra S. ; Wu, Pengfei ; Kothapalli, Sri-Rajasekhar ; Rao, D. V.G.L.N. ; Kimball, Brian R. ; Sai, S. Siva Sankara ; Gowrishankar, R. ; Sivaramakrishnan, S. / All-optical spatial filtering with power limiting materials. In: Optics Express. 2006 ; Vol. 14, No. 4. pp. 1451-1457.
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Yelleswarapu, CS, Wu, P, Kothapalli, S-R, Rao, DVGLN, Kimball, BR, Sai, SSS, Gowrishankar, R & Sivaramakrishnan, S 2006, 'All-optical spatial filtering with power limiting materials', Optics Express, vol. 14, no. 4, pp. 1451-1457. https://doi.org/10.1364/OE.14.001451

All-optical spatial filtering with power limiting materials. / Yelleswarapu, Chandra S.; Wu, Pengfei; Kothapalli, Sri-Rajasekhar; Rao, D. V.G.L.N.; Kimball, Brian R.; Sai, S. Siva Sankara; Gowrishankar, R.; Sivaramakrishnan, S.

In: Optics Express, Vol. 14, No. 4, 01.01.2006, p. 1451-1457.

Research output: Contribution to journalArticle

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Yelleswarapu CS, Wu P, Kothapalli S-R, Rao DVGLN, Kimball BR, Sai SSS et al. All-optical spatial filtering with power limiting materials. Optics Express. 2006 Jan 1;14(4):1451-1457. https://doi.org/10.1364/OE.14.001451