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Browsing by Subject "Diffraction gratings"

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Nonlocal photopolymerization kinetics including multiple termination mechanisms and dark reactions. Part I. Modeling

Gleeson, M. R. ; Sheridan, John T. (Optical Society of America, 2009-09-01)

The photochemical processes present during free-radical-based holographic grating formation are examined. A kinetic model is presented, which includes, in a more nearly complete and physically realistic way, most of the ...
Non-local polymerization driven diffusion based model : general dependence of the polymerization rate to the exposure intensity

Neipp, Cristian ; Beléndez, A. ; Sheridan, John T. ; Kelly, John V. ; O'Neill, Feidhlim T. ; Gallego, Sergi ; Ortuño, M. ; Pascual, I. (Optical Society of America, 2003-08-11)

The nonlocal diffusion model proposed by Sheridan and coworkers has provided a useful interpretation of the nature of grating formation inside photopolymer materials. This model accounts for some important experimental ...
Nonlocal polymerization-driven diffusion-model-based examination of the scaling law for holographic data storage

Sheridan, John T. ; Gleeson, Michael G. ; Kelly, John V. ; O'Neill, Feidhlim T. (Optical Society of America, 2005-02-01)

For the first time to our knowledge, a detailed theoretical basis is provided for the well-known inverse-square scaling law of holographic diffraction, which states that replay diffraction efficiency η=Γ/M2, where M is the ...
Photoinitiation study of Irgacure 784 in an epoxy resin photopolymer

Sabol, Dušan ; Gleeson, M. R. ; Liu, Shui ; Sheridan, John T. (American Institute of Physics (AIP), 2010-03-10)

A deeper understanding of the processes, which occur during free radical photopolymerization, is necessary in order to develop a fully comprehensive model, which represents their behavior during exposure. One of these ...
Physical and effective optical thickness of holographic diffraction gratings recorded in photopolymers

Gallego, Sergi ; Ortuño, M. ; Neipp, Cristian ; Márquez, A. ; Beléndez, A. ; Pascual, I. ; Kelly, John V. ; Sheridan, John T. (Optical Society of America, 2005-03-21)

In recent years the interest in thick holographic recording materials for storage applications has increased. In particular, photopolymers are interesting materials for obtaining inexpensive thick dry layers with low noise ...
Temporal analysis of grating formation in photopolymer using the nonlocal polymerization-driven diffusion model

Kelly, John V. ; Gleeson, M. R. ; Close, Ciara E. ; O'Neill, Feidhlim T. ; Sheridan, John T. ; Gallego, Sergi ; Neipp, Cristian (Optical Society of America, 2005-09-05)

The nonlocal polymerization-driven diffusion model (NPDD) has been shown to predict high spatial frequency cut-off in photopolymers and to accurately predict higher order grating components. We propose an extension ...
Temporal response and first order volume changes during grating formation in photopolymers

Kelly, John V. ; Gleeson, M. R. ; Close, Ciara E. ; O'Neill, Feidhlim T. ; Sheridan, John T. ; Gallego, Sergi ; Neipp, Cristian (American Institute of Physics, 2006-06)

We examine the evolution of the refractive index modulation when recording gratings in an acrylamide based photopolymer. A nonlocal diffusion model is used to predict theoretically the grating evolution. The model has been ...
Theoretical and experimental investigation of photopolymer chirped gratings formation

Dovolnov, Eugene A. ; Sharangovich, Sergey N. ; Sheridan, John T. (Optical Society of America, 2005-07-19)

In the work an analytical model of transmission holographic grating formation by light beams with non-uniform phase-amplitude profiles is presented. The model takes into consideration influence of light absorption of a ...