Entity

Time filter

Source Type

Oceanside, CA, United States

Khoury J.,Air Force Research Lab | Haji-Saeed B.,Air Force Research Lab | Woods C.L.,Air Force Research Lab | Kierstead J.,Solid State Scientific Corporation | And 2 more authors.
Optical Engineering | Year: 2011

In this paper, we exploit the nonlinearity inherent in four-wave mixing in organic photorefractive materials and demonstrate edge enhancement, contrast conversion, and defect enhancement in a periodic structure. With the availability of these materials, which have large space-bandwidth products, edge enhancement, contrast conversion and defect enhancement are possible. Some simulation results also are provided. © 2011 Society of Photo-Optical Instrumentation Engineers (SPIE). Source


Haji-Saeed B.,Air Force Research Lab | Woods C.L.,Air Force Research Lab | Kierstead J.,Solid State Scientific Corporation | Peyghambarian N.,University of Arizona | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

In this paper, we exploit the nonlinearity inherent in four-wave mixing in organic photorefractive materials and demonstrate edge enhancement, contrast conversion, and defect enhancement in a periodic structure. With the availability of these materials, which have large space-bandwidth products, edge enhancement, contrast conversion and defect enhancement are possible. © 2010 SPIE. Source


Christenson C.W.,University of Arizona | Blanche P.-A.,University of Arizona | Voorakaranam R.,University of Arizona | Bablumian A.,Tipd, Llc | And 4 more authors.
Optics InfoBase Conference Papers | Year: 2010

The first updatable three-dimensional holographic display based on a photorefractive polymer device, exhibiting a fast response, long persistency, and phase stability is discussed. Material and optical setup changes for new and broader applications are outlined. © 2009 Optical Society of America. Source


Christenson C.W.,University of Arizona | Thomas J.,University of Arizona | Blanche P.-A.,University of Arizona | Voorakaranam R.,University of Arizona | And 3 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

The electron transporting molecule tris(8-hydroxyquinoline) aluminum (Alq3) was introduced into a photorefractive composite in a low density to study the effects of electron traps on the performance. Compared to a control sample, Alq3 samples exhibited higher dielectric strength, over-modulation at reduced voltage, and increased writing speed. Transient measurements indicated grating revelation via decay of a competing grating. The dynamics are consistent with a bipolar charge transport model. Overall, Alq 3 improves the sensitivity, trapping, and breakdown voltage without significant losses in absorption or phase stability. © 2010 Copyright SPIE - The International Society for Optical Engineering. Source


Blanche P.-A.,University of Arizona | Bablumian A.,University of Arizona | Voorakaranam R.,University of Arizona | Christenson C.,University of Arizona | And 5 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2010

The very first demonstration of our refreshable holographic display based on photorefractive polymer was published in Nature early 20081. Based on the unique properties of a new organic photorefractive material and the holographic stereography technique, this display addressed a gap between large static holograms printed in permanent media (photopolymers) and small real time holographic systems like the MIT holovideo. Applications range from medical imaging to refreshable maps and advertisement. Here we are presenting several technical solutions for improving the performance parameters of the initial display from an optical point of view. Full color holograms can be generated thanks to angular multiplexing, the recording time can be reduced from minutes to seconds with a pulsed laser, and full parallax hologram can be recorded in a reasonable time thanks to parallel writing. We also discuss the future of such a display and the possibility of video rate. © 2009 Copyright SPIE - The International Society for Optical Engineering. Source

Discover hidden collaborations