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Proceedings of SPIE - The International Society for Optical Engineering

The invention relates to a method for producing holographic films, in which a photopolymer formulation is provided which comprises as constituents matrix polymers, writing monomers, a photoinitiatior system, optionally a non-photopolymerizable component and optionally catalysts, radical stabilizers, solvents, additives and other auxiliaries and/or additives. The photopolymer formulation is applied in a planar manner and in the form of a film on a support film and the photopolymer formulation is dried on the support film at a temperature 60 100 DEG C and are above the temperature T by at least 30 DEG C, and a photopolymer formulation having a plateau module of =0.030 MPa is used.

Method for producing a holographic film

Photoinitiator plays a crucial role on photopolymer. Unlike photoinitiator phenanthrenequinone (PQ), the solubility of Irgacure 784 dissolved in MMA is very high. In this paper, we use Irgacure 784 as photoinitiator doped in poly(methyl methacrylate)(PMMA)to make a bulk photopolymer with high photoinitiator concentration for holographic data storage. The effect of concentration of photoinitiator and record intensity are experimentally investigated. The results reveal the material has an optimum condition in holographic recording. A comparison between our material and the material of PQ doped PMMA is carried out by experiment. It is found that our material has better performance on diffraction efficiency, refractive index modulation and recording sensitivity. Besides, this material also has polarization sensitivity, which can be applied to polarization holography. With the capacity of recording polarization holography and conventional intensity holography simultaneously, the Irgacure 784 doped PMMA material is expected to be applied in holographic data storage.

Volume holographic recording in Irgacure 784-doped PMMA photopolymer.

The invention relates to a photopolymer formulation comprising matrix polymers, writing monomers, and photo initiators, comprising a combination of at least two different writing monomers. The invention further relates to the use of the photopolymer formulation for producing optical elements, in particular for producing holographic elements and images, to a method for producing the photopolymer formulation and to a method for illuminating holographic media made of the photopolymer formulation.

Photopolymer formulation having different writing comonomers

The subject matter of the invention is a method for producing illuminated, holographic media comprising a photopolymer formulation having the adjustable mechanical modulus GUV. A further subject matter of the invention is an illuminated, holographic medium that can be obtained by means of the method according to the invention.

Photopolymer formulations having the adjustable mechanical modulus GUV

Disclosed is a volume phase hologram recording material of high sensitivity, high contrast, and excellent record retention properties and also disclosed is a volume phase hologram recording medium using the said material. The volume phase hologram recording material mainly contains a three-dimensional crosslinked polymer matrix, a radically polymerizable monomer, and a photoradical polymerization initiator. The three-dimensional crosslinked polymer matrix is formed from a matrix-forming compound having two photoradically polymerizable unsaturated groups and two non-photoradically polymerizable hydroxyl groups represented by the following general formula (1) and another matrix-forming compound having no photoradically polymerizable group.

Volume phase hologram recording material and optical information recording medium

PROBLEM TO BE SOLVED: To provide a photosensitive material having excellent transparency and little volumetric shrinkage at exposure as an optical product forming a refractive index modulation structure in a material, in particular capable of preferably using as a hologram recording medium.SOLUTION: The photosensitive material comprises a polymer matrix including a cyclic oligosaccharide derivative as a structural unit, a radical-polymerizable monomer, and a radical photopolymerization initiator.

Photosensitive material, photosensitive-material precursor, and method for producing photosensitive material

Disclosed are a volume phase hologram recording material having high sensitivity, high contrast, and excellent multiple recording and record holding properties and a volume phase hologram recording medium using the same. The volume phase hologram recording material comprises mainly a polymer matrix (a), a radically photopolymerizable compound (b), and a radical photopolymerization initiator (c) and the polymer matrix is a three-dimensionally crosslinked or linear polymer matrix formed from a polymer matrix-forming material containing 0.5-50 wt % of an episulfide compound (f), an epoxy compound (g), and a curing agent (h).

Volume phase hologram recording material and optical information recording medium using the same

To improve the recording density of angle-multiplexed holographic memory, it is effective to increase the numerical aperture of the lens and to shorten the wavelength of the laser source as well as to increase the multiplexing number. The angular selectivity of a hologram, which determines the multiplexing number, is dependent on the incident angle of not only the reference beam but also the signal beam to the holographic recording medium. The actual signal beam, which is a convergent or divergent beam, is regarded as the sum of plane waves that have different propagation directions, angular selectivities, and optimal angular spacings. In this paper, focusing on the differences in the optimal angular spacing, we proposed a method to control the angular spacing for each segmented data page. We investigated the angular selectivity of a hologram and crosstalk for segmented data pages using numerical simulation. The experimental results showed a practical bit-error rate on the order of 10-3.

Angular Spacing Control for Segmented Data Pages in Angle-Multiplexed Holographic Memory

The deposition of reflector after writing (DRAW) process has been proposed for the fabrication of reflective-type holographic read-only memories. In the DRAW process, a reflector is deposited on a recording medium after signal writing, resulting in the reduction of noise holograms written by reflected beams from a reflector in the write process. Significant improvements are experimentally confirmed in read and write (R/W) performances in DRAW-processed holographic media. The combination of the DRAW process and an aromatic photopolymer recording material realizes low noise, high signal-to-noise ratio, and low symbol error rate characteristics at large multiplexing numbers up to 1020. In conventional reflective-type holographic media, ghost noise is superimposed on the readout signal, causing deterioration in R/W characteristics. The wave vector analyses clarify the mechanism by which the noise holograms are written and ghost noise is superimposed on the signal beam in the conventional media.

Kazuyoshi Masaki

Papers

Volume phase hologram recording material and optical information recording medium

Photosensitive material, photosensitive-material precursor, and method for producing photosensitive material

Volume phase hologram recording material and optical information recording medium using the same

Angular Spacing Control for Segmented Data Pages in Angle-Multiplexed Holographic Memory

Holographic Read-Only Memory Fabricated by Deposition of Reflector after Writing Process with Aromatic Photopolymer Recording Layer