JPH07181876A - Hologram recording material, hologram recording medium and production of hologram using the same - Google Patents

Abstract

PURPOSE:To provide a hologram recording material and hologram recording medium having a high sensitivity over a wide wavelength region, chemical stability, excellent resolution, diffraction sensitivity and transparency and excellent light resistance and a process for production of a hologram by using this material and this medium. CONSTITUTION:This hologram recording material contains a high-molecular polymer without having an arom. ring or heterocycle in the molecule (A), a monomer contg. a sulfur atom and an aliphat. condensed polycyclic group in the molecule (B), visible lightsensitizing dye (C) and a photopolymn. initiator (D). This hologram recording medium is obtd. by forming this hologram recording material as a photosensitive film on a base material. This process for production of the hologram comprises subjecting the hologram recording medium to hologram exposing, then applying light or heat thereto at the time of forming the hologram by using the hologram recording medium described above.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention has high sensitivity over a wide wavelength range, is chemically stable, has high resolution, high diffraction efficiency,
The present invention relates to a hologram recording material and a hologram recording medium having excellent transparency and light resistance, and a hologram manufacturing method using the hologram recording material.

[0002]

2. Description of the Related Art Conventionally, as a method for producing a hologram using a photopolymer, there has been proposed a method in which a hologram recording medium made of a photopolymer is exposed to a radiation interference pattern and then developed with a developing solution. For example, in JP-B-62-22152, a photosensitive material obtained by combining a polymer to be a carrier with a polyfunctional monomer having two or more ethylenically unsaturated bonds and a photopolymerization initiator is disclosed. Exposed to the interference pattern of No. 1, a second step of treating the photosensitive material with a first solvent to swell the photosensitive material, a second step of treating with a second solvent having a poor swelling action to shrink the photosensitive material Disclosed is a method for producing a hologram using a photopolymer, which comprises the third step. According to the known technique, it is possible to manufacture a hologram that is excellent in terms of diffraction efficiency, resolution, environment resistance, etc., but it is inferior in sensitivity characteristics and photosensitive wavelength region characteristics, or a wet treatment process is adopted in hologram manufacturing. However, there are drawbacks such as complications in production such as the occurrence of defects and problems such as uneven development due to voids and cracks generated during the solvent immersion operation and deterioration of transparency due to whitening.

On the other hand, a hologram recording material capable of producing a hologram by only interference exposure as the only processing step without requiring a development processing step with a developing solution in the hologram manufacturing step is "Applied Optics". , Vol. 15, No. 2, p. 534 (1976), as a known technique. It consists of a combination of a low refractive index monomer and a high refractive index non-reactive material.
Furthermore, JP-A-3-36582 and JP-A-3-2
Japanese Patent No. 49785 discloses a hologram recording material characterized by combining an allyl monomer and an acrylic monomer having different refractive indices and polymerizability. According to this known technique, the volume phase type hologram with high diffraction efficiency can be manufactured by "Holographic Display Research Society Bulletin", Vol. 10, No. 1, pp. 3 (1
990). However, since all of these known techniques use a monomer having fluidity as a main component, it is necessary to previously perform a treatment for suppressing fluidity of the photosensitive film such as heat treatment before hologram exposure. However, there are drawbacks such as complicated operation and difficulty in controlling the film thickness.

Similarly, there is disclosed a hologram recording material (and) using a photopolymer capable of manufacturing a hologram only by interference exposure, or a manufacturing method thereof. For example, in Japanese Patent Application Laid-Open No. 2-3081,
A photopolymerizable composition for hologram recording and a refractive index imaging element, which are characterized by comprising a solvent-soluble thermoplastic polymer, a liquid ethylenic monomer, and a photopolymerization initiator, are disclosed. In the photopolymerizable composition for hologram recording, in order to increase the refractive index modulation caused by exposure to the interference pattern of radiation, either the polymer or the monomer has an aromatic ring or a halogen atom-containing substituent. It is composed of a combination of. However, due to the use of these aromatic or halogen atom-containing compounds, yellowing of the hologram under environmental exposure is a concern, and a material that further improves weather resistance, that is, a group of compounds containing aromatic or halogen atoms. There has been a demand for a hologram recording material which does not use

[0005]

DISCLOSURE OF THE INVENTION The present invention has a high sensitivity over a wide wavelength region, is chemically stable, has a high resolution,
Provided are a hologram recording material and a hologram recording medium which are excellent in diffraction efficiency, transparency and light resistance, and a simple method for producing a hologram using the hologram recording material.

[0006]

Means for Solving the Problems In consideration of the above points, the present inventors have made earnest studies to achieve the above object, and as a result,
The present invention has been achieved.

That is, the first invention of the present invention is a high-molecular polymer (A) having no aromatic ring or heterocycle in the molecule,
A hologram recording material containing a monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule, a visible light sensitizing dye (C), and a photopolymerization initiator (D). The present hologram recording material is a hologram recording medium formed by forming a photosensitive film on an optically transparent substrate, and the third invention is a hologram recording medium for producing a hologram using the hologram recording medium. It is a method for producing a hologram, which comprises subjecting a medium to hologram exposure and then applying light or heat.

The present invention will be described in detail below.
First, a high molecular polymer (A) having no aromatic ring or heterocyclic ring in the molecule, which is used in the present invention, is exemplified. Main examples thereof include homopolymers of vinyl monomers or copolymers of two or more components, and examples thereof include methyl, ethyl, propyl, isopropyl, n-butyl, sec-butyl, tert-butyl, pentyl and neopentyl. , Hexyl, heptyl, octyl, nonyl, dodecyl, 2-
Methylbutyl, 3-methylbutyl, 2-ethylbutyl,
Chain, branched and cyclic alkyl (meth) acrylic acid ester monomers such as 1,3-dimethylbutyl, 2-ethylhexyl, 2-methylpentyl, cyclohexyl, adamantyl, isobornyl, dicyclopentanyl and tetrahydrofurfuryl Polymers of (meth) acrylic acid ester monomers having hydroxyl groups such as 2-hydroxyethyl, 2-hydroxypropyl, 4-hydroxybutyl, etc., and (meth) acryl containing epoxy groups such as glycidyl (meth) acrylate. Polymer of acid ester monomer, N, N-dimethylaminoethyl, N, N-
Polymers of amino group-containing (meth) acrylic acid ester monomers such as diethylaminoethyl and t-butylaminoethyl, (meth) acrylic acid, itaconic acid, maleic acid, 2- (meth) acryloyloxypropylhexahydrophthalic acid Polymers of vinyl monomers containing carboxyl groups such as, polymers of phosphate group-containing (meth) acrylic acid ester monomers such as ethylene oxide modified phosphoric acid (meth) acrylates, acrylamides, N-butyl acrylamides, N, N- Examples thereof include polymers of vinyl monomers such as dimethylacrylamide, N-vinylpyrrolidone, acrylonitrile, vinyl acetate, vinyl butyral, vinyl acetal and vinyl formal.
Furthermore, copolymers of two or more components of these vinyl monomers are also included.

In the present invention, particularly preferable examples of the polymer (A) having no aromatic ring or heterocycle in the molecule include polyvinyl acetate, polyvinyl butyral, polyvinyl acetal and polyvinyl formal.

Next, the monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group used in the present invention will be described. The monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule as used herein means a bicyclic terpene skeleton such as a pinanyl group, a bornyl group, an isobornyl group or a phencenyl group, or a bicyclopentadiene in the molecule. , Tricyclopentadiene skeleton, and the like having an aliphatic condensed polycyclic structure, for example, isobornylthioacrylate, isobornylthiomethacrylate, norbornylthioacrylate, norbornylthiomethacrylate, bornylthio. Examples thereof include acrylate, bornyl thiomethacrylate, pinanyl thioacrylate, pinanyl thiomethacrylate and their ethylene oxide- and propylene oxide-modified acrylates and methacrylates, and arylates.

Further, in the present invention, as the monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule, particularly preferable one is the general formula (1).

[0012]

[Chemical 2] (However, n is an integer of 1 or 2, R, R'is a hydrogen atom or an alkyl group, S is a sulfur atom, X, X'is a polymerizable compound containing at least one of an acryloyl group, a methacryloyl group, and an allyl group. Which represents a substituent).

The monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule, which is suitable for such purpose, is described in, for example, Japanese Patent Publication No. 5-11108. Sulfur-containing methacrylic acid ester, ethylene oxide-modified (meth) acrylic acid monomer of tricyclodecane described in JP-A-62-283109, tricyclodecane described in JP-A-63-268707. And ethylene oxide-modified (meth) acrylic acid polymerizable monomers, sulfur-containing acrylic acid esters described in JP-A-5-230013, and the like.

Since the monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the series of molecules has a high refractive index, a high molecular polymer (A) having no aromatic ring or heterocycle in the molecule ( A large difference in refractive index from A) can be taken,
When hologram recording is performed by the interference pattern of radiation, it is possible to create a hologram with high diffraction efficiency, and because it has high optical transparency and extremely low yellowing, the light resistance of the formed hologram is high. Can be extremely increased.

Next, the visible light sensitizing dye (C) used in the present invention will be described. These are added for the purpose of absorbing light in the visible region and enhancing activity against light. Specific examples of such a visible light sensitizing dye (C) include unsaturated ketones represented by chalcone derivatives and dibenzalacetone, 1,2-diketone derivatives represented by benzyl and camphorquinone, and the like. Benzoin derivative, fluorene derivative, naphthoquinone derivative, anthraquinone derivative, xanthene derivative, thioxanthene derivative, xanthone derivative, thioxanthone derivative, coumarin derivative, ketocoumarin derivative, styryl derivative, cyanine derivative, merocyanine derivative, oxonol derivative, acridine derivative, azine derivative, thiazine Derivative, oxazine derivative, indoline derivative, azulene derivative, azulenium derivative, squarylium derivative, porphyrin derivative, tetraphenylporphyrin derivative, triarylmethane derivative, te Labenzoporphyrin derivative, tetrapyrazinoporphyrazine derivative, phthalocyanine derivative, tetraazaporphyrazine derivative, tetraquinoxalyloporphyrazine derivative, naphthalocyanine derivative, pyrylium derivative, thiopyrylium derivative, tetraphyrin derivative, anulene derivative, spiropyran derivative, spiro Oxazine derivatives, thiospiropyran derivatives, organic ruthenium complexes and the like, and more specifically, edited by Nobu Okawara et al., "Dye Handbook" (1986, Kodansha), Nobu Okawara et al., "Chemistry of Functional Dyes" ( Dyes and sensitizers described in "Special Functional Materials" (1986, CMC), edited by Tadasaburo Ikemori, 1981, CMC). Two or more kinds of these may be used in an arbitrary ratio as needed.

Next, the photopolymerization initiator (D) used in the present invention will be described. The composition is combined with the visible light sensitizing dye (C) to enhance the activity against light, and is added for the purpose of producing a hologram recording material having extremely high sensitivity.

As the photopolymerization initiator (D) suitable for such purpose, 2,2'-bis (o-chlorophenyl) -4,4 ', 5,5'-tetraphenyl-1,1' is used.
-Biimidazole and bis (2,4,5-triphenyl)
Bisimidazole derivatives such as imidazolyl, N-arylglycine derivatives such as N-phenylglycine,
Examples thereof include organic azide compounds such as 4,4′-diazidochalcone, titanocenes described in JP-A-61-151197, and aluminate complexes described in JP-A-3-209477.

As a preferred photopolymerization initiator (D), tris (trichloromethyl) -2,4,6- described in British Patent 1388492 and JP-A-53-133428 is used.
2,4,6-substituted triazine compounds such as triazine,
JP-A-59-189340 and JP-A-60-7.
3,3'4,4'-tetra (te described in Japanese Patent No. 6503).
organic peroxides such as (rt-butylperoxycarbonyl) benzophenone, JP-A-1-54440, EP 109851, and EP 12671.
Issue 2, "Journal of Imaging Science
(J.Imag.Sci.) ", Volume 30, p. 174 (1986)
The described metal arene complexes, N-alkoxypyridinium salts such as 1-methoxy-4-phenylpyridinium tetraphenylborate described in JP-A-63-142345, diphenyliodonium hexafluorophosphate, di (p-tolyl) iodonium hexafluoro. Diaryl iodonium salts such as phosphate, di (p-tert-butylphenyl) iodonium hexafluorophosphate, diphenyliodonium hexafluoroantimonate, triphenylsulfonium hexafluorophosphate, diphenylphenacylsulfonium hexafluoroantimonate, dimethylphenacylsulfonium hexahydrate Fluorophosphate, benzyl-4-hydroxyphenylmethylsulfonium hexafluoroantimonate Sulfonium salts such bets, including onium salts such as oxosulfonium salts such as tetraphenyl-oxo hexafluorophosphate and the like.

Among them, particularly preferred photopolymerization initiator (D)
Examples thereof include an iodonium organic boron complex such as diphenyliodonium (n-butyl) triphenylborate described in JP-A-3-704, diphenylphenacylsulfonium (n-butyl) triphenylborate, dimethylphenacylsulfonium (n-). Examples thereof include sulfonium organic boron complexes such as butyl) triphenylborate.

The hologram recording material of the present invention may contain a thermal polymerization inhibitor for the purpose of preventing polymerization during storage. Specific examples of the thermal polymerization inhibitor that can be added to the hologram recording material of the present invention include p-methoxyphenol, hydroquinone, alkyl-substituted hydroquinone,
Catechol, tert-butylcatechol, phenothiazine, etc. can be mentioned, and these thermal polymerization inhibitors are
It is preferably added in an amount of 0.001 to 5 parts by weight with respect to 100 parts by weight of the compound having a radically polymerizable ethylenically unsaturated bond.

Further, the hologram recording material of the present invention further comprises amines, thiols, and
It is possible to add a polymerization accelerator typified by disulfide, a chain transfer catalyst, or the like. Specific examples of the polymerization accelerator and the chain transfer catalyst that can be added to the hologram recording material of the present invention include amines such as triethanolamine and N, N-diethylaniline, USP No. 4414312.
And thiols described in JP-A No. 64-13144, disulfides described in JP-A No. 2-2911561, thiones described in USP No. 3558322 and JP-A No. 64-17048, and JP-A No. 2-291560. Examples thereof include O-acyl thiohydroxamate and N-alkoxy pyridine thiones. The hologram recording material of the present invention is further mixed with an oxygen scavenger or reducing agent such as phosphine, phosphonate or phosphite, an antihalation agent, a plasticizer, a leveling agent, an ultraviolet absorber or an antistatic agent according to the purpose. You may use it.

The hologram recording material used in the present invention includes a polymer (A) having no aromatic ring or heterocycle in the molecule, a monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule. ), A visible light sensitizing dye (C), and a photopolymerization initiator (D) are dissolved in a suitable solvent at an arbitrary ratio, and the resulting solution is used as a photosensitive film on an optically transparent substrate. It can be formed and used as a hologram recording medium. The blending ratio of each component of the hologram recording material used in the present invention is preferably 10 to 10 for the high molecular polymer (A) having essentially no aromatic ring or heterocyclic ring in the molecule with respect to the entire hologram recording material. 90% by weight, more preferably 30 to 70% by weight, preferably 10 to 10% by weight of the monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule.
90 wt%, more preferably 30 to 70 wt%, visible light sensitizing dye (C) is preferably 0.001 to 10 wt%, more preferably 0.01 to 1 wt%, photopolymerization initiator (D) Is preferably 0.001 to 10% by weight, more preferably 0.01 to 1% by weight. In addition, the visible light sensitizing dye (C) has a transmittance of 10% or more for irradiation laser light when formed as a hologram recording medium by forming a photosensitive film on an optically transparent substrate. It is preferable to adjust the concentration. By selecting such a compounding ratio, a hologram recording material having high diffraction efficiency and high sensitivity characteristics can be obtained.

The hologram recording material having the above composition ratio is dissolved in a suitable solvent, and a spin coater, a roll coater, a knife coater, a bar coater or the like is used to directly directly obtain a glass plate, a plastic plate or a plastic film. It is used as a hologram recording medium by being formed as a photosensitive film on a substrate such as. The hologram recording medium obtained here may further have a protective layer for blocking oxygen on the photosensitive film. For the protective layer, a film or plate made of a plastic such as polyolefin, polyvinyl chloride, polyvinylidene chloride, polyvinyl alcohol or polyethylene terephthalate is laminated. Alternatively, a glass plate may be attached. Further, between the protective layer and the photosensitive film (and) or between the substrate and the photosensitive film, a pressure-sensitive adhesive or an organic solvent may be present to enhance airtightness. The hologram recording medium obtained as described above is fixed to a holder or the like so as not to be affected by vibration, and then He-Cd laser, Ar ion laser, He-Ne laser, Kr ion laser,
Hologram recording is performed by irradiating a visible light laser such as a ruby laser. FIG. 1 shows an example of the optical system. The hologram recorded in this manner requires application of light or heat for fixing an unexposed portion or a portion having a small exposure amount. In addition to the visible light laser shown above, the light is a carbon arc lamp, high pressure mercury lamp, xenon lamp,
Uses visible or ultraviolet light from metal halide lamps, fluorescent lamps, tungsten lamps, etc. Also, the heat is 40
It is preferable to heat between 0 ° C and 160 ° C. further,
Light and heat may be applied simultaneously to the hologram recorded hologram, or light and heat may be applied separately. Further, an operation of peeling the protective layer may be performed before and after applying light or heat.

[0024]

The hologram recording material used in the present invention comprises a high molecular polymer (A) having no aromatic ring or heterocyclic ring in the molecule,
It is characterized by containing a monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule, a visible light sensitizing dye (C), and a photopolymerization initiator (D). When a hologram recording medium prepared using this hologram recording material is subjected to hologram exposure, the visible light sensitizing dye (C) absorbs and excites laser light, which induces decomposition of the photopolymerization initiator (D). It is considered that free radicals are generated, and as a result, the monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule is polymerized. At this time, light interference occurs in the hologram recording medium depending on the hologram exposure,
A polymerization reaction of the monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group occurs in the molecule at a site having a strong interference action. Here, a difference in refractive index occurs between the polymer produced by this polymerization reaction and the polymer (A) having no aromatic ring or heterocycle in the molecule, and a hologram is formed.

After the hologram exposure, a post-treatment step with light or heat is added to accelerate the polymerization of the unreacted monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule, Holograms that are chemically stable and do not age are produced. In addition, the visible light sensitizing dye (C) that remains is effectively decolorized by this post-treatment step, and the transparency of the hologram is improved. On the other hand, the hologram recording material used in the present invention is
Both the high-molecular polymer (A) and the monomer (B) are characterized by using a compound that does not have an aromatic ring or a heterocycle in the molecule, and therefore, in long-term exposure to actinic rays such as sunlight. In addition, it has come to have the feature that the formed hologram does not turn yellow.

[0026]

The present invention will be described in more detail based on the following examples. In the following examples, parts represent parts by weight unless otherwise specified.

Example 1 100 parts of polyvinyl acetate as a polymer (A) having no aromatic ring or heterocycle in the molecule, a monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule As dicyclopentanyl dithiothiacrylate (refractive index = 1.51) as a visible light sensitizing dye (C)
3,3′-carbonylbis (7-diethylaminocoumarin) as a photopolymerization initiator (D) and diphenyliodonium hexafluorophosphate as 2.5 parts
And 1000 parts of dichloromethane as a solvent were prepared. This sensitizing solution is 100 × 125 × 3m
A 10 mil applicator was applied onto a glass plate of m and dried in an oven at 50 ° C. for 10 minutes to prepare a hologram recording medium. The thickness of the photosensitive layer after drying is 29μ
It was m. Further, as a protective layer, a 10% aqueous solution of polyvinyl alcohol was applied to the photosensitive layer side with a 3 mil applicator. Using this hologram recording medium, the optical system for hologram production shown in FIG. 1 was used to expose the 488 nm light of an Ar ion laser by two-beam interference to obtain an exposure dose of 10 mJ.
Hologram exposure was performed at / cm ² . After performing the hologram exposure, one of the two light beams is further blocked and exposed to the same exposure amount as the hologram exposure, and then 1 hour in a 100 ° C oven.
Left for hours. Diffraction efficiency is AR manufactured by JASCO Corporation
It measured with the T25C type spectrophotometer. The device has a width of 3 mm
A photomultimeter having a slit can be installed on a circle having a radius of 20 cm around the sample. Width 0.3m
Monochromatic light of m was incident on the sample at an angle of 45 degrees, and the diffracted light from the sample was detected. The diffraction efficiency was defined as the ratio between the maximum value other than the specular reflection light and the value when the incident light was received directly without placing the sample. Table 2 shows the diffraction efficiency and playback wavelength of the obtained hologram, and the results of storage stability and light resistance test.

Comparative Examples 1 to 5 As comparative examples, in the same manner as in Example 1, instead of dicyclopentanyldithioacrylate, phenoxyethyl acrylate (refractive index = 1.52), lauryl acrylate (refractive index = 1 .44), tetrahydrofurfuryl acrylate (refractive index = 1.46), cyclohexyl acrylate (refractive index = 1.46), and triethylene glycol diacrylate (refractive index = 1.46) in 90 parts each. It was done using. When phenoxyethyl acrylate was used (Comparative Example 1), a hologram having a diffraction efficiency of 80% was obtained, but a light resistance test using a fade meter (25 ° C., 50,000 lux, 10 days).
Turned yellow. Also, no hologram was obtained in the examples other than phenoxyethyl acrylate (Comparative Examples 2 to 5).

Examples 2 to 5 As in Example 1, instead of polyvinyl acetate,
A hologram was prepared using the hologram recording medium containing 100 parts of the high molecular weight polymer (A) having no aromatic ring or heterocyclic ring shown in Table 1. The results are shown in Table 2. Good holograms were obtained in both cases.

Examples 6 to 11 As in Example 1, instead of dicyclopentanyldithioacrylate, a monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule shown in Table 3 was used. A hologram was created using a hologram recording medium containing 90 parts. The results are shown in Table 4. Good holograms were obtained in both cases. Examples 12 to 16 A hologram containing 1 part by weight of the visible light sensitizing dye (C) shown in Table 5 in place of 3,3′-carbonylbis (7-diethylaminocoumarin) in the same manner as in Example 1. A hologram was created using the recording medium. The results are shown in Table 6. Good holograms were obtained in both cases. Examples 17 to 20 In the same manner as in Example 1, a hologram recording medium containing 2.5 parts by weight of the photopolymerization initiator (D) shown in Table 7 instead of diphenyliodonium hexafluorophosphate was used to form a hologram. Created. The results are shown in Table 8. Good holograms were obtained in both cases.

[0031]

[Table 1]

[0032]

[Table 2]

[0033]

[Table 3]

[0034]

[Table 4]

[0035]

[Table 5]

[0036]

[Table 6]

[0037]

[Table 7]

[0038]

[Table 8]

[0039]

By using the hologram recording material and the hologram recording medium of the present invention, and the hologram manufacturing method using the same, it is possible to obtain high sensitivity, chemical stability, and high resolution over a wide wavelength range. , High diffraction efficiency,
A hologram having high transparency and excellent light resistance can be easily manufactured.

[Brief description of drawings]

FIG. 1 is a block diagram of a two-beam exposure apparatus for hologram production.

[Explanation of symbols]

 1: Laser oscillator 2: Mirror 3: Lens 4: Spatial filter 5: Base material (glass plate) 6: Hologram photosensitive layer 7: Protective layer (polyvinyl alcohol film)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yen Yasuike 2-3-13, Kyobashi, Chuo-ku, Tokyo Toyo Inki Manufacturing Co., Ltd.

Claims (4)

[Claims] 1. A polymer (A) having no aromatic ring or heterocycle in the molecule, a monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule, and a visible light sensitizing dye ( C), a hologram recording material containing a photopolymerization initiator (D). 2. The monomer according to claim 1, wherein the monomer (B) containing a sulfur atom and an aliphatic condensed polycyclic group in the molecule is any of the compounds represented by the general formula (1). Holographic recording material. [Chemical 1] (However, n is an integer of 1 or 2, R, R'is a hydrogen atom or an alkyl group, S is a sulfur atom, X, X'is a polymerizable compound containing at least one of an acryloyl group, a methacryloyl group, and an allyl group. Represents a substituent) 3. The hologram recording material according to claim 1,
A hologram recording medium comprising a photosensitive layer formed on an optically transparent substrate. 4. The hologram recording medium according to claim 3,
A method for producing a hologram, which comprises applying light or heat after hologram exposure.