All-optical spatial filtering with power limiting materials
Year: 2006
Type: article
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.
Source: Optics Express
DOI: 10.1364/oe.14.001451
Authors: Chandra Yelleswarapu, Pengfei Wu, Sri-Rajasekhar Kothapalli, D. V. G. L. N. Rao, Brian Kimball, S. Siva Sankara Sai, R. Gowrishankar, S. Sivaramakrishnan
Language: English
Subfield: Biomedical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,270
OpenAlex ID: W1980193590