Prof. Manuel Francisco Ortuño Sanchez Profile

Prof. Manuel Francisco Ortuño Sanchez

Professor at Univ de Alicante

SPIE Involvement:

Author

Publications (54)

Proceedings Article | 31 May 2023 Presentation + Paper

High-performance liquid chromatography and UV-visible measurements to optimize the storage of volume holograms in hydrogels

Kheloud Berramdane, Manuel Ramírez, María Isabel Lucío, María-José Bañuls, Ángel Maquieira, Daniel Cárdenas, Belén Nieto-Rodríguez, Marta Morales-Vidal, Manuel Ortuño, Inmaculada Pascual

Proceedings Volume 12574, 125740I (2023) https://doi.org/10.1117/12.2665905

KEYWORDS: Holograms, Hydrogels, Holography, Liquids, Optical gratings, Chromatography, Diffraction, Absorption, Polymers, Signal detection

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Proceedings Article | 31 May 2023 Poster

Design and development of an innovative and simple optical sensor for the detection of acetic acid

Wafaa Miloua, V. Navarro-Fuster, M. Morales, M. G. Ramirez, Manuel Ortuño, Inmaculada Pascual

Proceedings Volume 12572, 125721P (2023) https://doi.org/10.1117/12.2668892

KEYWORDS: Optical sensors, Design and modelling, Diffusion, Visualization, Visual optics, Technology, Solids, Sensors, Metals, Liquids

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Proceedings Article | 24 May 2022 Presentation + Paper

Photopolymer characterization by high frequency pulsed laser

D. Puerto, S. Gallego, J. Sirvent-Verdú, M. Ortuño, A. Márquez, I. Pascual, A. Belendez

Proceedings Volume 12151, 1215105 (2022) https://doi.org/10.1117/12.2622684

KEYWORDS: Pulsed laser operation, Polymers, Phase shift keying, Phase modulation, Continuous wave operation, Refractive index, Holography, Polymerization, Liquid crystals, Diffraction

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Proceedings Article | 18 April 2021 Presentation + Paper

Waveguide couplers based on HPDLC for see-through applications: initiator optimization

S. Gallego, D. Puerto, C. Neipp, M. Ortuño, I. Pascual, A. Beléndez

Proceedings Volume 11774, 117740Y (2021) https://doi.org/10.1117/12.2589970

KEYWORDS: Waveguides, Polymers, Refractive index, Modulation, Liquid crystals, Holography, Holographic optical elements, Photorefractive polymers, Photopolymers, Photons

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Proceedings Article | 14 May 2019 Presentation + Paper

Reflection holograms stored in an environment-friendly photopolymer

Manuel Ramírez, Daniel Sirvent, Manuel Ortuño, Víctor Navarro-Fuster, Francisco Martínez, Augusto Beléndez, Inmaculada Pascual Villalobos

Proceedings Volume 11030, 110300E (2019) https://doi.org/10.1117/12.2521439

KEYWORDS: Holography, Holograms, Spatial frequencies, Diffraction gratings, Diffraction, Polymers, Light emitting diodes

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In recent years, the development of low-toxicity photopolymers for holographic recording in reflection mode has reached great importance. One of the main advantages of reflection holograms is that they can be reconstructed using white light, which has enabled that many researches have focused on the development of sensors for different types of analytes. Optical data storage and three-dimensional multiplexing of reflection holograms to improve the data storage density have also been investigated through reflection holograms. However, the photopolymers used in these researches have certain undesirable features such as the toxicity of some of their components and non-environmentally compatibility. The common used hydrophilic photopolymers content poly(vinyl alcohol) (PVA) or gelatine binder and monomers related to acrylamide. This compound has a high potential to cause cancer. For this reason, we developed a photopolymer called “Biophotopol” as a recording holographic material for optical applications. “Biophotopol” have a low toxicity, good recycling properties and is environmental-friendly. The basic formulation of “Biophotopol” includes an initiator system which is a free radical generator composed by triethanolamine as co-initiator and plasticizer and sodium salt 5’- 72 riboflavin monophosphate as sensitizer dye, sodium acrylate as polymerizable monomer and PVA as inert binder polymer. Additionally, a cross-linking agent, as N,N’-(1,2-dihydroxyethylene)bisacrylamide (DHEBA) , can also be added. Volume transmission gratins and holographic lens have been fabricated in this photopolymer but not researches have been done to store reflection gratins. Is know that for higher spatial frequencies, the diffraction efficiency decreases considerably as the spatial frequency increases. In this sense, the general aim of this work has been fabricated reflection gratings in the symmetrical experimental setup in “Biophotopol” and to study the dependence of diffraction efficiency on physical thickness, recording intensity and exposure energy. First, films physical thickness was investigated. The maximum diffraction efficiency was obtained for thicknesses around 145 µm. The photopolymer layers uniformity was highly sensitive to drying and environmental conditions during the exposure stage. Therefore, both conditions were investigated and very controlled. An increase in diffraction efficiency was observed when the photopolymer films were cured with a LED lamp to improve the stability of the reflection holograms. The residual dye is eliminated during this process. The maximums diffraction efficiencies around 30 % were obtained for reflection gratings with a spatial frequency of 4738 lines/mm. The index modulation and optical thickness were obtained by fitting procedure through coupled wave theory. Experimental and theoretical results have been interpreted to modify the photopolymer formulation and exposure conditions in order to increase the diffraction efficiencies.

Proceedings Article | 7 September 2018 Paper

Anamorphic characterization of a PA-LCoS based holographic data storage system

Francisco J. Martínez-Guardiola, Andrés Márquez, Eva Calzado, Roberto Fernández, Cristian Neipp, Manuel Ortuño, Inmaculada Pascual, Sergi Gallego

Proceedings Volume 10751, 1075112 (2018) https://doi.org/10.1117/12.2321276

KEYWORDS: Image resolution, Holographic data storage systems, CCD cameras, Error analysis, Liquid crystal on silicon, Statistical analysis, Image filtering, Binary data, Image retrieval, Beam splitters

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Proceedings Article | 24 August 2017 Paper

Diffractive lenses in biocompatible photopolymers using LCoS

Roberto Fernández, Sergi Gallego, Víctor Navarro-Fuster, Manuel Ortuño, Andrés Márquez, C. Neipp, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 10395, 103951D (2017) https://doi.org/10.1117/12.2273840

KEYWORDS: Photopolymers, Liquid crystal on silicon, Modulation, Lenses, LCDs, Spatial light modulators, Diffractive optical elements, Optical properties, Image processing, Optical recording

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The improving of the technology related to the Spatial Light Modulators (SLM), which can be used to modulate the wavefront of a light beam in many different applications in Optics and Photonics, has widespread their use in many new ways. In particular, the continue miniaturization of the pixel size let them be used as a master for Diffractive Optical Elements(DOE) recording applications. One of these displays isthe parallel-addressed liquid crystal on silicon (PA-LCoS) microdisplay, which offers easily the possibility of phase-only modulation without coupled amplitude modulation, but can be use also as an amplitude master just rotating the angles of two polarizers. Together with the DOEs, the optic recording material is also one of the crucial componentsin the system. Photoresist has been used classically for this purpose. Recently some works provide results of the incorporation of photopolymers, initially used for holographic recording, to fabricate DOEs. Among photopolymers, polyvinil alcohol/acrylamide (PVA/AA) materials have been studied firstly due to the accurate control of their optical properties and the ease of fabrication. Nevertheless, this kind of photopolymer presents a high level of toxicity due mainly to the monomer, acrylamide. In this sense, we made efforts to search alternative “green” photopolymers, one of these is called “Biophotopol”. This material presents good optical properties; although, it has two principal drawbacks: its refractive index modulation is lower than the PVA/AA one and the dye used presents very low absorption at 532 nm. In order to solve these problems for recording spherical diffractive lenses, in the present work we have explored different possibilities. On the first place, we have modified the fabrication technique of the solid layer to achieve thicker samples, on the second place, we have introduced a biocompatible crosslinker monomer. These two actions provide us a higher value of the phase modulation capability. On the third place, we have modified the dye to record DOE’s with the wavelength of 532 nm and obtain a direct comparison with the results obtained with PVA/AA materials.

Proceedings Article | 15 May 2017 Paper

Multiplexed holograms recorded in a low toxicity Biophotopol photopolymer

Víctor Navarro-Fuster, Manuel Ortuño, Sergi Gallego, Roberto Fernández, Francisco Martínez-Guardiola, Andrés Márquez, Inmaculada Pascual

Proceedings Volume 10233, 102331O (2017) https://doi.org/10.1117/12.2264903

KEYWORDS: Humidity, Argon ion lasers, Holography, Diffraction, Multiplexing, Diffraction gratings, Holograms, Toxicity, Holographic materials, Holographic optical elements, Sensors, Photonics

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Proceedings Article | 15 May 2017 Presentation + Paper

Shrinkage measurement for holographic recording materials

R. Fernández, S. Gallego, A. Márquez, J. Francés, V. Navarro Fuster, C. Neipp, M. Ortuño, A. Beléndez, I. Pascual

Proceedings Volume 10233, 102330C (2017) https://doi.org/10.1117/12.2265180

KEYWORDS: Diffraction, Holography, Photopolymers, Holographic materials, Liquid crystals, Holography applications, Nanoparticles, Molecules, Thin films, LCDs, Holograms

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Proceedings Article | 27 April 2016 Paper

Analysis of holographic data storage using a PA-LCoS device

Francisco Martínez, Andrés Márquez, Sergi Gallego, Sandra Fenoll, Manuel Ortuño, Jorge Francés, Sergio Bleda, Inmaculada Pascual

Proceedings Volume 9889, 988922 (2016) https://doi.org/10.1117/12.2227948

KEYWORDS: LCDs, Spatial light modulators, Modulation, Holographic data storage systems, Phase shift keying, Holography, Liquid crystal on silicon, Binary data, Signal processing, Data storage, Spatial light modulators, Amplitude modulation, Polarizers

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Proceedings Article | 9 September 2015 Paper

Study of the index matching for different photopolymers

Roberto Fernández, Sergi Gallego, Andrés Márquez, Manuel Ortuño, Stephan Marini, Inmaculada Pascual, Augusto Beléndez

Proceedings Volume 9598, 95980A (2015) https://doi.org/10.1117/12.2188349

KEYWORDS: Liquids, Photopolymers, Refractive index, Diffusion, LCDs, Diffractive optical elements, Sodium, Polymers, Polymerization, Modulation

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Proceedings Article | 9 September 2015 Paper

Static and dynamic effects of flicker in phase multilevel elements on LCoS devices

A. Márquez, F. Martínez, S. Gallego, M. Ortuño, J. Francés, A. Beléndez, I. Pascual

Proceedings Volume 9598, 95980C (2015) https://doi.org/10.1117/12.2188039

KEYWORDS: Diffraction, Diffraction gratings, Liquid crystal on silicon, Quantization, Calibration, Spatial light modulators, Modulation, Polarimetry, Phase shift keying, Reverse modeling

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Proceedings Article | 19 September 2014 Paper

Averaged Stokes polarimetry applied to characterize parallel-aligned liquid crystal on silicon displays

A. Márquez, F. Martínez, S. Gallego, M. Ortuño, J. Francés, A. Beléndez, I. Pascual

Proceedings Volume 9216, 92160H (2014) https://doi.org/10.1117/12.2061581

KEYWORDS: Polarimetry, Liquid crystal on silicon, Wave plates, LCDs, Polarization, Poincaré sphere, Calibration, Modulation, Instrument modeling, Electro optical modeling

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Proceedings Article | 19 September 2014 Paper

Influence of the photopolymer properties in the fabrication of diffractive optical elements

Sergi Gallego, Roberto Fernández, Andrés Márquez, Francisco Martínez, Cristian Neipp, Manuel Ortuño, Jorge Francés, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 9216, 921619 (2014) https://doi.org/10.1117/12.2060990

KEYWORDS: Polymers, Diffractive optical elements, Refractive index, Diffusion, Holography, Binary data, Absorption, Signal attenuation, Ions, Optical components

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Proceedings Article | 22 August 2014 Paper

Influence of a bleaching post-exposure treatment in the performance of H-PDLC devices with high electric conductivity

Manuel Ortuño, Andrés Márquez, Sergi Gallego, Roberto Fernandez, Víctor Navarro-Fuster, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 9286, 92865C (2014) https://doi.org/10.1117/12.2063540

KEYWORDS: Liquid crystals, Electro optics, Diffraction, Holography, Polymers, Diffraction gratings, Molecules, Holograms, Glasses, Ions

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SPIE Journal Paper | 24 June 2014

Electrical dependencies of optical modulation capabilities in digitally addressed parallel aligned liquid crystal on silicon devices

Francisco Javier Martínez, Andrés Márquez, Sergi Gallego, Manuel Ortuño, Jorge Francés, Augusto Beléndez, Inmaculada Pascual

OE, Vol. 53, Issue 06, 067104, (June 2014) https://doi.org/10.1117/12.10.1117/1.OE.53.6.067104

KEYWORDS: Modulation, Liquid crystal on silicon, Phase shift keying, Polarimetry, Polarizers, Calibration, Quantization, Optical engineering, Spatial light modulators, LCDs

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Proceedings Article | 1 May 2014 Paper

Holographic transmission gratings stored with high spatial frequency in PVA/AA photopolymers

E. Fernández, R. Fuentes, M. Ortuño, A. Beléndez, I. Pascual

Proceedings Volume 9131, 91311Z (2014) https://doi.org/10.1117/12.2052417

KEYWORDS: Spatial frequencies, Diffraction gratings, Photopolymers, Holography, Diffraction, Spatial resolution, Data storage, Holograms, Beam splitters, Humidity

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Proceedings Article | 26 September 2013 Paper

Study of the modulation capabilities of parallel aligned liquid crystal on silicon displays

A. Márquez, F. Martínez, S. Gallego, M. Ortuño, J. Francés, A. Beléndez, I. Pascual

Proceedings Volume 8855, 885504 (2013) https://doi.org/10.1117/12.2023266

KEYWORDS: Liquid crystal on silicon, Modulation, Phase shift keying, Polarizers, LCDs, Calibration, Polarimetry, Wave plates, Spatial light modulators, Resistors

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Proceedings Article | 26 September 2013 Paper

Analysis of the fabrication of diffractive optical elements in photopolymers

S. Gallego, A. Márquez, R. Fernández, Á. Piera, F. Martínez-Gaurdioloa, M. Ortuño, J. Francés, A. Beléndez, I. Pascual

Proceedings Volume 8855, 88550V (2013) https://doi.org/10.1117/12.2023861

KEYWORDS: Photopolymers, Diffractive optical elements, Linear filtering, Diffusion, LCDs, Refractive index, Optical filters, Polymers, Binary data, Spatial frequencies

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Proceedings Article | 15 October 2012 Paper

Classical polarimetric method revisited to analyse the modulation capabilities of parallel aligned liquid crystal on silicon displays

A. Márquez, F. Martínez, S. Gallego, M. Ortuño, J. Francés, A. Beléndez, I. Pascual

Proceedings Volume 8498, 84980L (2012) https://doi.org/10.1117/12.929677

KEYWORDS: Liquid crystal on silicon, Wave plates, Polarimetry, Modulation, Polarizers, Phase shift keying, LCDs, Radiometry, Beam splitters, Oscilloscopes

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Proceedings Article | 15 October 2012 Paper

A dynamic beam splitter using polymer dispersed liquid crystal materials

Marina Riquelme, Manuel Ortuño, Andrés Márquez, Sergi Gallego, Inmaculada Pascual, Augusto Beléndez

Proceedings Volume 8498, 84980I (2012) https://doi.org/10.1117/12.929538

KEYWORDS: Liquid crystals, Diffraction, Holography, Beam splitters, Polymers, Holographic optical elements, Refractive index, Diffraction gratings, Electro optics, Molecules

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Proceedings Article | 5 May 2012 Paper

Study of the stability in holographic reflection gratings recorded in PVA/AA-based photopolymer

Elena Fernández, Rosa Fuentes, Manuel Ortuño, Andres Marquez, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 8429, 84291Z (2012) https://doi.org/10.1117/12.921636

KEYWORDS: Diffraction gratings, Diffraction, Holography, Transmittance, Reflection, Bridges, Spectrophotometry, Refractive index, Optical design, Absorption

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Proceedings Article | 5 May 2012 Paper

Analysis of the geometry of a holographic memory setup

A. Márquez, E. Fernández, F. J. Martínez, S. Gallego, M. Ortuño, A. Beléndez, I. Pascual

Proceedings Volume 8429, 84291Y (2012) https://doi.org/10.1117/12.921294

KEYWORDS: Holography, Binary data, Fourier transforms, Wavefronts, Optical correlators, Data storage, Beam splitters, Optical signal processing, Lenses, Cameras

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Proceedings Article | 5 May 2012 Paper

Analysis of PEA photopolymers at zero spatial frequency limit

Sergi Gallego, Andrés Márquez, Marina Riquelme, Cristian Neipp, Manuel Ortuño, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 8429, 842925 (2012) https://doi.org/10.1117/12.921789

KEYWORDS: Photopolymers, Liquid crystals, Spatial frequencies, Phase shifts, Polymerization, Molecules, Holography, Liquids, Polymers, Crystals

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Proceedings Article | 24 December 2011 Paper

Performance improvement of high-thickness photopolymers for holographic data storage applications

M. Ortuño, S. Gallego, A. Márquez, C. Neipp, I. Pascual, A. Beléndez

Proceedings Volume 8204, 820432 (2011) https://doi.org/10.1117/12.902889

KEYWORDS: Photopolymers, Polymers, Diffraction, Holography, Scattering, Molecules, Diffraction gratings, Holography applications, Data storage, Photopolymerization

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Proceedings Article | 24 December 2011 Paper

Comparison of photopolymers for optical data storage applications and relief diffractive optical elements recorded onto photopolymers

S. Gallego, A. Márquez, M. Ortuño, C. Neipp, A. Beléndez, I. Pascual

Proceedings Volume 8204, 820421 (2011) https://doi.org/10.1117/12.902694

KEYWORDS: Photopolymers, Diffusion, Spatial frequencies, Plating, Holography, Diffractive optical elements, Polymerization, Diffraction, Data storage, Diffraction gratings

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Proceedings Article | 5 October 2011 Paper

Corrected coupled-wave theory for non-slanted reflection gratings

L. Alberto Estepa, Cristian Neipp, Jorge Francés, Andrés Márquez, Sergio Bleda, Manuel Pérez-Molina, Manuel Ortuño, Sergi Gallego

Proceedings Volume 8171, 81710R (2011) https://doi.org/10.1117/12.896877

KEYWORDS: Diffraction gratings, Refractive index, Diffraction, Modulation, Wave propagation, Differential equations, Chemical mechanical planarization, Dielectrics, Maxwell's equations, Holograms

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Proceedings Article | 11 May 2011 Paper

Electromagnetic analysis and characterization of photonic crystal fibers with slit-like geometry

Manuel Pérez-Molina, Jorge Frances, Sergi Gallego, Manuel Ortuño, Augusto Beléndez

Proceedings Volume 8073, 80732O (2011) https://doi.org/10.1117/12.887074

KEYWORDS: Polarization, Finite-difference time-domain method, Electromagnetism, Radio propagation, Birefringence, Photonic crystal fibers, Ultrafast phenomena, Pulse shaping, Dispersion, Wave propagation

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Proceedings Article | 18 May 2010 Paper

Initiator system in holographic photopolymer materials

M. Ortuño, E. Fernández, R. Fuentes, S. Gallego, A. Márquez

Proceedings Volume 7722, 772222 (2010) https://doi.org/10.1117/12.853789

KEYWORDS: Holographic materials, Holography, Polymers, Diffraction, Holograms, Photopolymers, Diffraction gratings, Crystals, Nitrogen, Argon ion lasers

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Proceedings Article | 14 May 2010 Paper

New photopolymers with high environmental compatibility: biophotopol compared to PVA/AA materials at zero spatial frequency limit

S. Gallego, A. Márquez, M. Ortuño, S. Marini, D. Méndez, I. Pascual

Proceedings Volume 7717, 771716 (2010) https://doi.org/10.1117/12.853800

KEYWORDS: Photopolymers, Phase shifts, Spatial frequencies, Holography, Modulation, Polymerization, Pollution control, Interferometry, Toxicity, Holographic materials

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Proceedings Article | 14 May 2010 Paper

Generation of diffractive optical elements onto a photopolymer using a liquid crystal display

A. Márquez, S. Gallego, M. Ortuño, E. Fernández, M. Álvarez, A. Beléndez, I. Pascual

Proceedings Volume 7717, 77170D (2010) https://doi.org/10.1117/12.854786

KEYWORDS: LCDs, Calibration, Lenses, Phase shift keying, Diffractive optical elements, Modulation, CCD cameras, Holography, Diffusion, Transparency

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Proceedings Article | 20 May 2009 Paper

Linear response deviations in photopolymers

M. Ortuño, C. Neipp, E. Fernández, M. Álvarez, A. Beléndez

Proceedings Volume 7358, 735815 (2009) https://doi.org/10.1117/12.820449

KEYWORDS: Photopolymers, Diffraction, Diffusion, Polymers, Diffraction gratings, Modulation, Holography, Holograms, Refractive index, Polymerization

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Proceedings Article | 19 May 2009 Paper

Multiplexing holograms for data page storage using a LCD as hybrid ternary modulation

Elena Fernández, Manuel Ortuño, Sergi Gallego, Celia García, Andrés Márquez, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 7358, 73581C (2009) https://doi.org/10.1117/12.820622

KEYWORDS: Holograms, LCDs, Multiplexing, Holography, Image quality, Data storage, Modulation, Fourier transforms, Polarizers, 3D image reconstruction

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Proceedings Article | 25 January 2008 Paper

New trends on photopolymers

M. Ortuño, E. Fernández, S. Gallego, A. Márquez, C. Neipp, I. Pascual, A. Beléndez

Proceedings Volume 6912, 691207 (2008) https://doi.org/10.1117/12.762658

KEYWORDS: Photopolymers, Holography, Holograms, Diffraction, Toxicity, Polymers, Diffraction gratings, Holographic optical elements, Holographic materials, Humidity

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Proceedings Article | 25 January 2008 Paper

Multiplexing holograms for data page storage as a holographic memory in a PVA/AA photopolymer

Elena Fernández, Manuel Ortuño, Sergi Gallego, Celia García, Andrés Márquez, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 6912, 691214 (2008) https://doi.org/10.1117/12.762565

KEYWORDS: Holograms, LCDs, Holography, Multiplexing, Data storage, Image quality, Polarizers, Charge-coupled devices, Holographic materials, Spatial light modulators

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Proceedings Article | 25 January 2008 Paper

Real-time interferometric characterization of a PVA based photopolymer

Andrés Márquez, Sergi Gallego, David Méndez, Manuel Ortuño, Elena Fernández, Mariela Álvarez, Cristian Neipp, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 6912, 691217 (2008) https://doi.org/10.1117/12.763548

KEYWORDS: Modulation, Holography, Interferometers, Interferometry, Spatial frequencies, Diffusion, Phase shift keying, Phase shifts, Holographic materials, Polymers

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Proceedings Article | 9 May 2007 Paper

Optimization of a holographic memory setup using a LCD and a PVA based photopolymer

Elena Fernández, Manuel Ortuño, Andrés Márquez, Sergi Gallego, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 6587, 65870J (2007) https://doi.org/10.1117/12.722917

KEYWORDS: LCDs, Holography, Image quality, Holograms, Data storage, Spatial light modulators, Holographic materials, 3D image reconstruction, Charge-coupled devices, Image processing

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Proceedings Article | 9 May 2007 Paper

Characterization and optimization of liquid crystal displays for data storage applications

Andrés Márquez, Sergi Gallego, David Méndez, Mariela Álvarez, Elena Fernández, Manuel Ortuño, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 6587, 658715 (2007) https://doi.org/10.1117/12.722647

KEYWORDS: Modulation, LCDs, Phase shift keying, Binary data, Fourier transforms, Holography, Birefringence, Data storage, Holographic data storage systems, Amplitude modulation

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Proceedings Article | 9 June 2006 Paper

Analysis of amplitude and phase coupling in volume holography

A. Márquez, C. Neipp, L. Yaroslavsky, S. Gallego, M. Ortuño, A. Beléndez, I. Pascual

Proceedings Volume 6252, 62521H (2006) https://doi.org/10.1117/12.677159

KEYWORDS: Modulation, Phase shift keying, Holograms, Volume holography, Computer generated holography, Phase modulation, Holography, Amplitude modulation, Wavefronts, Diffraction gratings

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Proceedings Article | 9 June 2006 Paper

3D behaviour of photopolymers as holographic recording material

Sergi Gallego, Manuel Ortuño, Cristian Neipp, A. Márquez, John Kelly, John Sheridan, Augusto Beléndez, Inmaculada Pascual

Proceedings Volume 6252, 62520B (2006) https://doi.org/10.1117/12.676525

KEYWORDS: Photopolymers, Holography, Signal attenuation, Polymerization, Refractive index, Diffusion, 3D modeling, Modulation, Holographic materials, Holograms

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Proceedings Article | 9 June 2006 Paper

High thickness acrylamide photopolymer for peristrophic multiplexing

Manuel Ortuño, Elena Fernández, A. Márquez, Sergi Gallego, Cristian Neipp, Inmaculada Pascual

Proceedings Volume 6252, 62520U (2006) https://doi.org/10.1117/12.677014

KEYWORDS: Holograms, Multiplexing, Diffraction gratings, Holography, Diffraction, Holographic materials, Nd:YAG lasers, Helium neon lasers, Polymers, Plutonium

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The acrylamide photolymers are considered interesting materials for holographic media. They have high diffraction efficiency (ratio of the intensities of the diffracted and the incident beams), an intermediate energetic sensitivity among other materials and post-processing steps are not necessary, therefore the media is not altered. The layers of these materials, about 1 mm thick, are a suitable media for recording many diffraction gratings in the same volume of photopolymer using peristrophic multiplexing technique, with great practical importance in the field of holographic memories type WORM (write once read many). In this work we study the recording of diffraction gratings by peristrophic multiplexing with axis of rotation perpendicular to the recording media. The photopolymer is composed of acrylamide as the polymerizable monomer, triethanolamine as radical generator, yellowish eosin as sensitizer and a binder of polyvinyl alcohol. We analyze the holographic behaviour of the material during recording and reconstruction of diffraction gratings using a continuous Nd:YAG laser (532 nm) at an intensity of 5 mW/cm² as recording laser. The response of the material is monitored after recording with an He-Ne laser. We study the recording process of unslanted diffraction gratings of 1125 lines/mm. The diffraction efficiency of each hologram is seen to decrease as the number of holograms recorded increases, due to consumption of the available dynamic range, in a constant exposure scheduling. It can be seen that the photopolymer works well with high energy levels, without excessive dispersion of light by noise gratings. In order to homogenize the diffraction efficiency of each hologram we use the method proposed by Pu. This method is designed to share all or part of the avaliable dynamic range of the recording material among the holograms to be multiplexed. Using exposure schedules derived from this method we have used 3 scheduling recordings from the algorithm used. Additionaly, we use an exponential scheduling recording in order to correct the exposure times from the first iteration of the algorithm.

Proceedings Article | 25 April 2006 Paper

3-dimensional analysis of holographic memories based on photopolymers using finite differences method

Sergi Gallego, Manuel Ortuño, Cristian Neipp, Andrés Márquez, Augusto Beléndez, Elena Fernández, John Kelly, John Sheridan

Proceedings Volume 6187, 618714 (2006) https://doi.org/10.1117/12.662481

KEYWORDS: Polymers, Diffusion, Photopolymers, Refractive index, Signal attenuation, Holography, Modulation, Finite difference methods, Polymerization, Holograms

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Proceedings Article | 25 April 2006 Paper

Multiplexing holograms in an acrylamide photopolymer

Elena Fernández, Manuel Ortuño, Andrés Márquez, Sergi Gallego, Inmaculada Pascual

Proceedings Volume 6187, 618712 (2006) https://doi.org/10.1117/12.662400

KEYWORDS: Holograms, Diffraction, Multiplexing, Energy efficiency, Holography, Scanning electron microscopy, Diffraction gratings, Holographic materials, Polymers, Volume holography

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Proceedings Article | 24 October 2005 Open Access

Complementary approaches with and without a Fourier plane for optical image processing education

A. Márquez, C. Neipp, S. Gallego, M. Ortuño, I. Pascual, M. Yzuel, A. Beléndez, J. Campos

Proceedings Volume 9664, 966410 (2005) https://doi.org/10.1117/12.2207742

KEYWORDS: Image processing, Optical correlators, Diffraction gratings, Volume holography, Optical filters, Image transmission, Image filtering, Visualization, Fourier transforms, CCD cameras

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Proceedings Article | 8 June 2005 Paper

Maximum effective optical thickness of the gratings recorded in photopolymers

Sergi Gallego, M. Ortuno, Cristian Neipp, A. Marquez, A. Belendez, I. Pascual

Proceedings Volume 5827, (2005) https://doi.org/10.1117/12.605070

KEYWORDS: Photopolymers, Holography, Modulation, Holograms, Signal attenuation, Diffraction gratings, Diffraction, Refractive index, Multiplexing, Scanners

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Proceedings Article | 8 June 2005 Paper

Diffusion parameters estimation of holographic memories based in PVA/acrylamide photopolymer

Sergi Gallego, M. Ortuno, Cristian Neipp, A. Marquez, A. Belendez, I. Pascual

Proceedings Volume 5827, (2005) https://doi.org/10.1117/12.605081

KEYWORDS: Diffusion, Holography, Polymers, Holograms, Polymerization, Diffraction, Diffraction gratings, Refractive index, Multiplexing, Modulation

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Proceedings Article | 8 June 2005 Paper

Holographic optical elements for Bragg image processing

A. Marquez, Cristian Neipp, Sergi Gallego, M. Ortuno, A. Belendez, I. Pascual

Proceedings Volume 5827, (2005) https://doi.org/10.1117/12.605233

KEYWORDS: Holographic optical elements, Image processing, Holography, Fourier optics, Lenses, Mirrors, Data processing, Fourier transforms, Volume holography, Diffraction

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Proceedings Article | 8 June 2005 Paper

Effects in reconstruction of diffraction gratings multiplexed in acrylamide photopolymers

M. Ortuno, Sergi Gallego, A. Marquez, Cristian Neipp, A. Belendez, I. Pascual

Proceedings Volume 5827, (2005) https://doi.org/10.1117/12.604804

KEYWORDS: Multiplexing, Holograms, Diffraction gratings, Optical engineering, Applied physics, Diffraction, Polymers, Diffusion, Polymerization

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Proceedings Article | 1 September 2004 Paper

High-efficiency volume holograms recording on acrylamide and N,N'methylene-bis-acrylamide photopolymer with pulsed laser

Sergi Gallego, Manuel Ortuno, Celia Garcia, Cristian Neipp, Augusto Belendez, Inmaculada Pascual

Proceedings Volume 5456, (2004) https://doi.org/10.1117/12.544990

KEYWORDS: Diffraction, Diffraction gratings, Pulsed laser operation, Holograms, Modulation, Beam splitters, Energy efficiency, Refractive index, Holography, Polymerization

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Proceedings Article | 1 September 2004 Paper

Space-variant image processing with volume holography

Andres Marquez, Cristian Neipp, Sergi Gallego, Manuel Ortuno, Augusto Belendez, Inmaculada Pascual

Proceedings Volume 5456, (2004) https://doi.org/10.1117/12.545451

KEYWORDS: Image enhancement, Image transmission, Holographic optical elements, Image processing, Diffraction, Holography, Diffraction gratings, Holograms, Image filtering, Optical filters

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Proceedings Article | 1 September 2004 Paper

Depth attenuated refractive index profiles in holographic gratings recorded in photopolymer materials

Sergi Gallego, Manuel Ortuno, Cristian Neipp, Andres Marquez, John Sheridan, Augusto Belendez, Inmaculada Pascual

Proceedings Volume 5456, (2004) https://doi.org/10.1117/12.545812

KEYWORDS: Signal attenuation, Refractive index, Holograms, Diffraction gratings, Photopolymers, Spatial frequencies, Polymerization, Polymers, Holography, Photopolymerization

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Proceedings Article | 1 September 2004 Paper

Optimization of a PVA/acrylamide material for the recording of multiple diffraction gratings

Manuel Ortuno, Sergi Gallego, Cristian Neipp, Andres Marquez, Augusto Belendez, Inmaculada Pascual

Proceedings Volume 5456, (2004) https://doi.org/10.1117/12.545841

KEYWORDS: Photopolymers, Diffraction gratings, Holography, Diffraction, Polymers, Holograms, Multiplexing, Holographic materials, Argon ion lasers, Data storage

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Proceedings Article | 8 December 2003 Paper

Holographic photopolymer materials with nonlocal and nonlinear response

John Kelly, Feidhlim O'Neill, John Sheridan, Cristian Neipp, Sergi Gallego, Manuel Ortuno

Proceedings Volume 5216, (2003) https://doi.org/10.1117/12.509138

KEYWORDS: Polymerization, Polymers, Refractive index, Diffusion, Holographic materials, Holography, Photopolymers, Holograms, Diffraction gratings, Photorefractive polymers

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Proceedings Article | 19 November 2003 Paper

A study of the holographic behaviour of thick dry layers of an acrylamide based photopolymer

M. Ortuno, S. Gallego, Celia Garcia, Augusto Belendez, Inmaculada Pascual

Proceedings Volume 4829, (2003) https://doi.org/10.1117/12.527003

KEYWORDS: Holography, Diffraction, Holographic materials, Liquids, Volume holography, Crystals, Diffraction gratings, Liquid crystals, Glasses, Holography applications

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Showing 5 of 54 publications

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