Improved maximum uniformity and capacity of multiple holograms recorded in absorbent photopolymers

Gallego, Sergi; Ortuño, Manuel; Neipp, Cristian; Fernández, Elena; Pascual, Inmaculada

doi:10.1364/oe.15.009308

Cited by 8 publications

(5 citation statements)

References 19 publications

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“…The material response depends on many parameters. When all of them are accurately determined, the material behavior can be modeled [15][16][17][18][19][20], enabling us to easily find the optimum schedule to multiplex many holograms for holographic memories [21,22], or the intensity distribution to obtain the desired DOE with the required relief structure or refractive index distribution [14]. To manufacture DOEs we have used a hybrid optical-digital system with a liquid crystal spatial light modulator (LC-SLM) performing the function of the master [14].…”

Section: Introductionmentioning

confidence: 99%

Influence of index matching on AA/PVA photopolymers for low spatial frequency recording

et al. 2015

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Photopolymers present appealing optical properties for holographic and diffractive applications. They enable modulation of the electrical permittivity and thickness and are self-processing, and layers with a wide range of thicknesses and properties can be fabricated on demand. In order to obtain a complete characterization of the material, low spatial frequency analysis has become a fundamental tool because the motion of the components inside of the material can be measured. We propose to use an index matching component to carry out a complete characterization and to differentiate the "apparent" and the real monomer diffusion. We also have quantified the minimum thickness to obtain the phase modulation of 2π required for the fabrication of many diffractive elements such as lenses, axicons, or blazed gratings. Finally, we have studied the influence of the thermal effects in the thickness variations.

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Section: Introductionmentioning

confidence: 99%

Influence of index matching on AA/PVA photopolymers for low spatial frequency recording

et al. 2015

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“…An extension to a general power law [ 24 ] with an exponent γ in the range of 0.5 to 1 was done in a later stage. Absorption effects have been included also [ 25 ].…”

Section: Modelling the Recording Mechanism Of Bayfol ® mentioning

confidence: 99%

The Chemistry and Physics of Bayfol® HX Film Holographic Photopolymer

2017

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Holographic photopolymers are a new technology to create passive diffractive optical elements by a pure laser interference recording. In this review, we explain the chemistry concepts of light harvesting in an interference pattern and the subsequent grating formation as chemical response. Using the example of the newly developed Bayfol ® HX film we discuss the reaction-diffusion driven photo-polymerization process for an index modulation formation to create volume phase gratings. Further we elucidate the selection of monomer chemistry and discuss details of the recording conditions based on the concept of exposure dosage and exposure time. Influences ranging from high dosage recording to low power recording are explained and how to affect the desired diffraction efficiency. Finally, we outline and demonstrate the process to mass manufacturing of volume phase gratings.

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“…Gallego et al [60] proposed a new method to record many angularly multiplexed holograms, having similar diffraction efficiency values by taking into account the different effective optical thickness of each hologram. The method therefore predicts the exposure times required to obtain maximum storage capacity.…”

Section: Physics Research Internationalmentioning

confidence: 99%

A Review of the Optimisation of Photopolymer Materials for Holographic Data Storage

Guo

Gleeson

Sheridan

2012

Physics Research International

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Photopolymers are very interesting as optically sensitive recording media due to the fact that they are inexpensive, self-processing materials with the ability to capture low-loss, high-fidelity volume recordings of 3D illuminating patterns. We have prepared this paper in part in order to enable the recognition of outstanding issues, which limit in particular the data storage capacity in holographic data storage media. In an attempt to further develop the data storage capacity and quality of the information stored, that is, the material sensitivity and resolution, a deeper understanding of such materials in order to improve them has become ever more crucial. In this paper a brief review of the optimisation of photopolymer materials for holographic data storage (HDS) applications is described. The key contributions of each work examined and many of the suggestions made for the improvement of the different photopolymer material discussed are presented.

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Improved maximum uniformity and capacity of multiple holograms recorded in absorbent photopolymers

Cited by 8 publications

References 19 publications

Influence of index matching on AA/PVA photopolymers for low spatial frequency recording

Influence of index matching on AA/PVA photopolymers for low spatial frequency recording

The Chemistry and Physics of Bayfol® HX Film Holographic Photopolymer

A Review of the Optimisation of Photopolymer Materials for Holographic Data Storage

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