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Transmission type volume hologram recording medium and manufacturing method thereof

A recording medium and holographic recording technology, applied in the manufacture of optical recording carriers, optical recording/reproduction/erasing methods, data recording, etc., can solve the problem of ineffective use of monomers, substrate thickness and refractive index recording and reproduction positions Eliminate problems such as deviation, achieve the effects of suppressing the intensity of diffracted light, easy manufacturing, and excellent separability

Inactive Publication Date: 2012-03-21
DAICEL CHEM IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, in the reflective type, there is a part that is only exposed to laser light, and the monomer cannot be effectively used. Therefore, there is still a problem in the use for high capacity of several terabytes or more.
In particular, when different kinds of substrates are used, there is a problem of slight deviation of the recording site from the reproduction position caused by the difference in thickness and refractive index of the substrates

Method used

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  • Transmission type volume hologram recording medium and manufacturing method thereof
  • Transmission type volume hologram recording medium and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0089] Difunctional alicyclic epoxy compound (3,4,3',4'-diepoxydicyclohexane) and bifunctional vinyl ether compound (oxanorbornene divinyl ether) were prepared in 7 : 1 molar ratio, heat treatment was carried out at 100° C. for 30 minutes in an air atmosphere using an oil bath. Prepare 100 parts by weight of the cationic polymerizable compound subjected to this heat treatment, 60 parts by weight of poly-2-vinylnaphthalene (Mw=93,000) as a binder polymer, and diphenyl iodide as a photopolymerization initiator. 10 parts by weight of the compound (PI2074, manufactured by Rhodia Corporation), and 0.5 parts by weight of a coumarin-based pigment (trade name "NKX1658", manufactured by Hayashibara Biochemical Research Institute) as a sensitizing pigment, these components were dissolved in cyclohexanone 30 In parts by weight, this was used as photosensitive liquid 1. Apply this photosensitive solution 1 on a 900 μm thick glass substrate [refractive index 1.518 (25° C.)] with an applic...

Embodiment 2

[0091] The holographic recording medium 2 was obtained by sandwiching the photosensitive layer with a 200 μm thick polycarbonate (PC) film [refractive index 1.580 (25° C.)] instead of the 200 μm PET film used as the covering base material in Example 1. Through the double-beam optical system, using semiconductor laser (532nm, exposure 100mJ / cm 2 ) to expose the holographic recording medium 2 to perform holographic recording. The results show that the diffraction efficiency is 61%, and the ratio of the second-order diffracted light to the first-order diffracted light is 6.7%.

Embodiment 3

[0093] The same photosensitive liquid 1 as in Example 1 was coated on a 200 μm thick PC film [refractive index 1.580 (25° C.)] with an applicator to make a thickness of 100 μm, and without contacting the coated photosensitive liquid A 100 μm thick liner film (PET) was provided along the edge of the substrate. Then, the photosensitive layer was sandwiched by a 200 μm-thick PET film [refractive index 1.671 (25° C.)], whereby a hologram recording medium 3 was obtained. Through the double-beam optical system, using semiconductor laser (532nm, exposure 100mJ / cm 2 ) to expose the holographic recording medium 3 to perform holographic recording. The results show that the diffraction efficiency is 40%, and the ratio of the second-order diffracted light to the first-order diffracted light is 5.6%.

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Abstract

Provided is a transmission type volume hologram recording medium used in a two-beam hologram recording system, having a high diffraction efficiency and capable of remarkably reducing the intensity of higher order diffracted light, which is a cause of a noise, than first-order diffracted light. A transmission type volume hologram recording medium has a volume hologram recording medium layer of a volume hologram recording photosensitive composition, which is held between opposed substrates having different materials. Each of the substrates which hold therebetween the volume hologram recording medium has a transparency in a visible light area, and preferably has a thickness in the range of 2 to 2000 [mu]m. Also, a difference in refractive index between the two substrates which hold therebetween the volume hologram recording medium is preferably 0.001 to 0.5. Moreover, preferably, a difference in thickness between the two substrates which hold therebetween the volume hologram recording medium is in the range of 1 to 1500 [mu]m.

Description

technical field [0001] The invention relates to a transmissive volume holographic recording medium with a laminated structure and a manufacturing method thereof. In more detail, the present invention relates to a transmission-type volume holographic recording medium and its manufacturing method. The transmission-type volume holographic recording medium performs holographic recording by a two-beam interference method, and its diffraction efficiency is excellent, and the first-order diffracted light can be significantly suppressed. The subsequent intensity of diffracted light causing noise. Background technique [0002] Because volume holograms can represent objects in three-dimensional form, have high diffraction efficiency and wavelength selectivity, and require a high degree of manufacturing technology, they have been widely used in design, security, and optical components. A volume hologram can be produced by interfering object light and reference light with high coherenc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03H1/02G11B7/0065G11B7/24G11B7/26G11B7/24035G11B7/24044G11B7/24047
CPCG03H1/02G11B7/24044G11B7/245G03H2250/37G03H1/0272G03H2001/0264G03H2001/0413G03H1/0248G11B7/0065G11B7/26
Inventor 水田智也三宅弘人
Owner DAICEL CHEM IND LTD
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