Recent research on an acrylamide-based photopolymerizable holographic recording material is presented. The characteristics of the are discussed in detail terms sensitivity, diffraction efficiency, linearity, resolution limit, and sources noise. Although not sufficient for reflection holography, excellent transmission gratings. was found to suffer no shrinkage during recording, high-diffraction-efficiency slanted gratings were made. Finally, suitability this self-developing both...

A reflection hologram for visual indication of environmental humidity has been studied. The is recorded in a self-developing photopolymer and changes color when exposed to change fully reversible. range change, reversibility, the response time have studied controlled environment. Fully reversible holograms with times from few seconds tens minutes designed. Extremely sensitive bright indicators, capable dramatic within breathing on them are demonstrated.

Recent work on an acrylamide-based photopolymer holographic recording medium is presented. The lifetime of recorded gratings improved by the addition cross-linking monomers. Shelf life also improved. effects various constituents photosensitive material are studied to determine optimum composition, and five xanthene dyes compared as possible sensitizers for system. With most sensitive dye concentrations other formulation presented with high sensitivity very diffraction efficiency. new works...

Results from the investigation of diffusion processes in a dry acrylamide-based photopolymer system are presented. The is carried out context experimental research on optimization high-spatial-frequency response photopolymer. Tracing transmission holographic grating dynamics at short times exposure utilized to measure coefficients. results reveal that two different contribute with opposite sign refractive-index modulation responsible for diffraction buildup. Monomer dark bright fringe areas...

Novel nanocomposites consisting of a water-soluble acrylamide-based photopolymer and colloidal zeolite nanoparticles Beta A were prepared. The interactions between the components in photopolymerizable characterized for first time by C13 nuclear magnetic resonance visible spectroscopy. It was found that (up to 5wt. %) behave as noninert additive, resulting an effective increase layer thickness, which causes doubling diffraction efficiency nanocomposite comparison undoped photopolymer. On...

A theoretical model for formation of a short-exposure holographic grating is presented. The accounts both monomer and polymer diffusion distinguishes between short chains capable diffusing long that are immobile. It shown the experimentally observed decrease diffraction efficiency at higher spatial frequency can be predicted by assuming short-chain polymers away from bright fringes. time evolution refractive-index modulation after exposure calculated compared with experimental results....

Inkjet printing and patterning strategies have been developed for fabrication of hybrid holographic sensors using zeolite nanocrystals on glass-supported photopolymers. The flexibility the proposed techniques was demonstrated by characterization two types sensors. first type, which is a reversible sensor, based transmission hologram recorded in hydrophobic MFI-type doped layer with high sensitivity toward alcohols. In this type sensor volume polymer achieved recording; pattern periodicity...

The holographic recording of gratings that have very large diffraction angles and/or slants is challenging because requires beam are not possible without the use prisms. However, by using a wavelength different from (usually shorter than) intended operating wavelength, it to record with less angles. In this paper, recently developed model allows systematic investigation potential and limits wavelength-shift technique extended include reflection format. Transmission options compared...

The patterning of an acrylamide-based photopolymer surface by holographic recording is studied. patterns are induced light alone and no post-processing required. Periodic modulation observed in addition to a volume phase grating. An investigation has been carried out using white interferometry into the dependence amplitude photo relief on spatial frequency, intensity sample thickness. dependencies indicate that diffusion material during plays major role formation. possibility for inscription...

The optical properties of photopolymer layers consisting an acrylamide-based matrix and microporous aluminophosphate nanocrystals AEI type are investigated. compatibility the doped with nanoparticles is studied. surface volume different levels doping characterized. effective refractive indices absorption coefficients determined used to calculate index porosity pure as dopants. Volume transmission gratings were recorded in at spatial frequencies. By monitoring characteristic Raman peak...

We report a simple, compact electronic speckle-pattern interferometer (ESPI) incorporating holographic optical elements (HOEs) for the study of out-of-plane vibration. Reflection and transmission HOEs provide reference object beams in interferometer. The alignment difficulties with conventional ESPI systems are minimized using HOEs. time-average subtraction method is used to generate fringe pattern remove background speckle noise by introducing phase shift between consecutive images....

Investigations of polymerization rates in an acrylamide-based photopolymer are presented. The rate for acrylamide and methylenebisacrylamide was determined by monitoring the changes characteristic vibrational peaks at 1284 1607 cm−1 corresponding to bending mode CH bond CC double bonds peak 1629 carbon-carbon using Raman spectroscopy. To study dependence on intensity find parameter, constant is measured different intensities. A comparison with a commercially available shows that this much faster.

We study the shrinkage in acrylamide based photopolymer by measuring Bragg detuning of transmission diffraction gratings recorded at different slant angles and intensities for a range spatial frequencies. Transmission frequencies 500, 1000, 1500 2000 lines/mm were an film having 60 ± 5 μm thickness. The grating thickness final obtained from angular selectivity curve hence caused holographic recording was calculated. material evaluated three 1, 10 mW/cm2 over angles, while total exposure...

The problems presented by counterfeit products and documentation are discussed. Limitations of existing holograms for anti-counterfeit applications described. We describe the advantages full holographic serialization requirements in terms materials techniques mass production true serialized holograms. These having been met, we report first time fully novelty approach consists direct use product manufacturer's information as object a recording system along with self-processing photopolymer...

A novel approach for measuring the diffusion coefficients in photopolymerisable materials is proposed. The method based on studying evolution of surface relief profile a single illuminated spot using an interferometric profiler. It shown that observed post-exposure swelling due to mass-transport monomer from unexposed exposed area driven by concentration gradient set up polymerization area. Appropriate choice thickness studied layers ensures both lateral movement and negligible contribution...

An acrylamide based photopolymer doped with pure silica MFI-type zeolite (silicalite-1) nanoparticles has been characterized for holographic recording purposes. The concentrations of the silicalite-1 in layers were 1, 2.5, 5 and 7.5 wt. %. inclusion nanoparticle resulted an increase diffraction efficiency by up to 40%, decrease shrinkage from 1.32% 0.57%. best results obtained % nanoparticles.

A nanoparticle-doped acrylic photopolymer is characterised as a material for holographic recording. The influence of nanoparticles on the dynamic range, dynamics recording, temporal stability and mechanical in terms shrinkage has been studied. recording are investigated by real time monitoring build up diffraction gratings spatial frequencies 200 to 2000 1/mm. slanted transmission observation change Bragg angle.