JP2880342B2 - Photosensitive recording medium for forming hologram and method for forming volume phase hologram using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photosensitive recording medium for forming a hologram and a method of forming a volume phase hologram using the same, and more particularly, to a difference in refractive index between bright fringes and dark fringes of interference fringes. TECHNICAL FIELD The present invention relates to a hologram-forming photosensitive recording medium capable of forming a stable hologram having a large value and a method of forming a volume phase hologram.

[0002]

2. Description of the Related Art When an object is irradiated with a light wave having good coherence such as laser light, the amplitude and phase are modulated according to the shape of the object. Holography is a technique in which such a modulated light wave (diffraction grating) is recorded on a photosensitive recording medium, and the obtained recorded matter (hologram) is irradiated again with a laser beam to reproduce an optical image of an original object. is there. With the progress of research on such holographic technology, the demand for the recording medium has become quite clear at present, and silver bleaching, photoresist, thermoplastics, dichromated gelatin, inorganic glass materials, ferroelectrics, etc. Materials have been proposed and their properties are being studied. For example,
As a photosensitive recording medium for hologram recording having a sensitivity in a photosensitive wavelength region of visible light, bleached silver salt or dichromated gelatin sensitized with methylene blue or the like is widely known. Also, in USP 4,942,112,
A photopolymerizable composition comprising a polymer binder and an ethylenically unsaturated monomer having a carbazole ring or an aromatic ring is disclosed.

Incidentally, the characteristics that the photosensitive recording medium for hologram recording should have are: (1) recording sensitivity, particularly sensitivity to laser light in the visible wavelength range and high sensitivity; (3) High diffraction efficiency of the hologram, (4) Low noise of the hologram, (5) Stable hologram, (6) Easy recording and reproduction operation And so on. On a known recording medium,
Not only materials satisfying all of these characteristics, but also materials having properties attaining partial practical use are extremely few.
Among them, the bleached silver salt and the dichromated gelatin-based recording medium have reached a certain level of practical use. However, the former method still has disadvantages that a bleaching operation is required in addition to the normal processing, and that the obtained hologram has poor light fastness. Also in the latter case, it is pointed out that the obtained hologram has poor moisture resistance and a large defect in storage stability. In addition, the aforementioned USP 4,94
In the recording medium described in the specification of Japanese Patent No. 2,112,
Further improvement is required so that a hologram having a large refractive index modulation and a small thickness can be obtained. Accordingly, an object of the present invention is to improve a hologram shape which can not be achieved by a known hologram recording medium and which is improved to satisfy the above-mentioned required characteristics.
Is to provide a method of forming a forming a photosensitive recording medium and using the same volume type phase hologram.

[0004]

The above objects are achieved by the present invention described below. That is, the present invention, La radical polymerizable monomers, cationic polymerizable monomers, the first wavelength region light irradiation
Radiation initiates the polymerization of the radically polymerizable monomer.
Radical polymerization initiator which, and to different from the first wavelength region light
Irradiation with the second wavelength band light, the cationic polymerizability
A photosensitive recording medium for forming a hologram, comprising a composition containing a cationic polymerization initiator for initiating polymerization of a monomer , and a method of forming a volume phase hologram using the recording medium.

[0005]

The photosensitive recording medium for forming a hologram of the present invention comprises :
La radical polymerizable monomers, cationic polymerizable monomers, the
Irradiation of the light in the wavelength region 1 causes the radical polymerizable monomer
A radical polymerization initiator for initiating the polymerization of
By irradiating the second wavelength band light different from the wavelength band light,
It contains a cationic polymerization initiator that initiates the polymerization of the cationically polymerizable monomer, and first forms a hologram latent image by selectively polymerizing a radically polymerizable monomer or a cationically polymerizable monomer at the bright line portion of interference fringes. After that,
By exposing the entire surface and polymerizing the radical polymerizable monomer and the cation polymerizable monomer in the dark line portion of the interference fringe, a large refractive index modulation can be obtained. That is, for example, first, the photosensitive recording medium for forming a hologram of the present invention is irradiated with coherent light corresponding to the hologram information to react only the radical polymerization initiator and polymerize only the radical polymerizable monomer. It is considered that as the radical polymerizable monomer is polymerized, the radical polymerizable monomer diffuses from the dark line portion to the bright line portion of the interference fringes, and as a result, a gradient of the density and the refractive index difference is generated. In this case, the wavelength range is set so that the cationic polymerization initiator is not sensitive to the irradiation light. Next, the entire surface is irradiated with light to which both the radical polymerization initiator and the cationic polymerization initiator are sensitive. As a result, the bright line portion of the formed hologram interference fringes consists only of the polymer of the radical polymerizable monomer, while the dark line portion of the interference fringes contains both the radical polymerizable monomer and the polymer of the cationic polymerizable monomer. And a large refractive index difference occurs between the bright line portion of the interference fringe and the dark line portion of the interference fringe. The above example is merely an example of the present invention. For example, contrary to the above example, first, only the cationically polymerizable monomer may be selectively polymerized.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to preferred embodiments. The radical polymerizable monomer used in the photosensitive recording medium for forming a hologram of the present invention is monofunctional or polyfunctional as long as it has an ethylenically unsaturated double bond in its molecular structure. Any of the above can be used. The form may be liquid or solid. Specifically,
1,5-pentanediol diacrylate, ethylene glycol diacrylate, 1,4-butanediol diacrylate, diethylene glycol diacrylate, hexamethylene glycol diacrylate, 1,3-propanediol diacrylate, decamethylene glycol diacrylate, decamethylene Glycol dimethacrylate, 1,4-cyclohexanediol diacrylate, 2,2-dimethylolpropane diacrylate, glycerol diacrylate, tripropylene glycol diacrylate, glycerol triacrylate, trimethylolpropane triacrylate, pentaerythritol triacrylate, poly Oxyethylate trimethylolpropane triacrylate or trimethacrylate, and the United States Huh similar compounds as mentioned in the 3,380,831 Patent specification, pentaerythritol tetraacrylate, triethylene glycol diacrylate, triethylene glycol dimethacrylate,
Polyoxypropyltrimethylolpropane triacrylate (462), ethylene glycol dimethacrylate, butylene glycol dimethacrylate, 1,3
-Propanediol dimethacrylate, 1,2,4-
Butanetrioltrimethacrylate, 2,2,4-
Trimethyl-1,3-pentanediol dimethacrylate, pentaerythritol trimethacrylate, pentaerythritol tetramethacrylate, trimethylol propane trimethacrylate, 1,5-pentanediol dimethacrylate, diallyl Rufumareto like.

Also useful are diphenols and dimethacrylates of bisphenol A and bisphenol A epoxy adducts, specifically, di- (3-methacryloxy-2-hydroxypropyl) ether of bisphenol-A. , Bisphenol-A di- (2-methacryloxyethyl) ether, bisphenol-A di (3-acryloxy-2-hydroxypropyl) ether, bisphenol-A di (2-acryloxyethyl) ether, ethoxy Rate bisphenol-A
Diacrylate, di- (3-methacryloxy-2-hydroxypropyl) ether of tetrachloro-bisphenol-A, di- (2-methacryloxyethyl) ether of tetrachloro-bisphenol-A, tetrabromo-bisphenol-A Di- (3-methacryloxy-2-hydroxypropyl) ether, tetrabromo-bisphenol-A di- (2-methacryloxyethyl) ether, and the like.

Further, compounds having an isocyanate group, for example, 1,4-cyclohexyldiisocyanate,
3,5-cyclohexyl triisocyanate, 1,4-
An addition polymer of a compound such as benzene diisocyanate and 2-hydroxyethyl acrylate (methacrylate), 2-hydroxypropyl acrylate or the like is also useful. Further, styrene, 2-chlorostyrene, phenyl acrylate, 2-phenylethyl acrylate, 2,2
'-Di (p-hydroxyphenyl) propane diacrylate and methacrylate, 1,4-benzenediacrylate and methacrylate, 1,4-diisopropenylbenzene, 1,3,5-triisopropenylbenzene and the like are also included. However, the radical polymerizable monomer used in the present invention is not limited to the above monomer.

More preferred radically polymerizable monomers include isobornyl methacrylate, isobornyl acrylate, adamantyl acrylate, methacrylate, CR-39, and dicyclopentadiene represented by the following structural formula (X) in the side chain. Acrylate, methacrylate, diacrylate, dimethacrylate,

[0010]

Embedded image For example, what is shown in the following formula,

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Embedded image Fentyl methacrylate, L-menthyl methacrylate,
Dimethyl adamantyl methacrylate,

A compound represented by the following general formula (I):

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[0012]

Embedded image And the like. These radical polymerizable monomers are
It is contained in the photosensitive composition at a ratio of 10 to 60% by weight.

Next, the cationically polymerizable monomer used in the present invention will be described. The monomer capable of cationic polymerization includes a monomer containing a cyclic ether represented by an epoxy ring or a thioether in its molecular structure. Particularly in terms of sensitivity, the following are typical alicyclic compounds, but the present invention is not limited thereto.

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[0014]

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Embedded image (1,2-, 1,3-, 1,4-substituted)

Embedded image (1,2-, 1,3-, 1,4-substituted)

[0015]

Embedded image (1,2-, 1,3-, 1,4-substituted)

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[0016]

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[0017]

Embedded image (1,2-, 1,3-, 1,4-substituted)

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[0018]

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The following vinyl ethers are also useful (see JVCrivello et.al. Journal of Polymer).
Science, polymer chemistry Ed., 21,1785 (1983)
).

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Embedded image (1,2-, 1,3-, 1,4-substituted)

Embedded image (1,2-, 1,3-, 1,4-substituted)

Further, spiroorthoesters, spiroorthocarbonates and bicycloorthoesters are also useful, especially since these compounds hardly shrink during polymerization.
It is preferable to obtain a large refractive index modulation.

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Embedded image (R represents an alkyl group or an alkoxy group, and n represents an arbitrary integer.) These cationically polymerizable monomers are 10 to 6
It is contained in the photosensitive composition at a ratio of 0% by weight.

As the polymerizable monomer used in the present invention, an amphoteric compound having a structure capable of cationic polymerization with an ethylenically unsaturated double bond in the molecular structure can also be used. For example, N-vinyl carbazole, 3-chlorovinyl carbazole, 3,6-dibromo-9-vinyl carbazole and the like, which are vinyl monomers containing a carbazole ring (cationically polymerizable) can be mentioned. Further, a compound having the following structure having an epoxy ring and an ethylenically unsaturated double bond can also be used.

Embedded image In the amphoteric monomer as described above, the reaction site is different between radical polymerization and cationic polymerization, so that refractive index modulation occurs. That is, if such an amphoteric monomer is used in the present invention, a hologram can be recorded with one kind of amphoteric monomer, a radical polymerization initiator and a cationic polymerization initiator.

Next, the photopolymerization initiator used in the present invention will be described. As the radical polymerization initiator, conventionally used aromatic ketones and aromatic diketones are useful. Examples include benzophenone derivatives, benzoin derivatives, benzyl derivatives, xatone derivatives, thioxanthone derivatives, ketocoumarin derivatives and the like. More specifically, benzophenone, Michler's ketone, benzyl, 4,4'-dimethoxybenzyl, camphorquinone, a benzophenone derivative having a peroxyester structure, xanthone, thioxanthone, 2-chlorothioxanthone, and 3-ketocoumarin derivative (Reference: DONALD .
P.SPECHT et.al.Tetrahedron vol.38 No.9 1203-12
11 (1982)), and as a commercial product, Irgacure 184 represented by the following formula and marketed by Ciba Geigy,
651, 907, etc. are also useful.

[0023]

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Embedded image Many of these compounds have effective absorption at short wavelengths (UV region) of about 400 nm or less. However,
At the time of hologram recording, a radical polymerization initiator effective in the visible light region is desirable. Examples of such an initiator include, for example, 3,3 ′ among the above 3-ketocoumarin derivatives.
A compound having a dialkylamino group at the 7-position of -carbonylbiscoumarin is preferable because it can be sensitized to about 500 nm.

Also, JP-A-62-143044, 62-
The cationic dye-borate anion complex described in US Pat.
It can be sensitized up to 800 nm, and is particularly useful as the radical polymerization initiator of the present invention. Furthermore, in recent years, studies have been actively conducted on composite polymerization initiators that effectively use light in the visible light region and that use a sensitizer and a radical generator in combination, and these composite initiators are also used in the present invention. Useful for As the sensitizer used at this time, merocyanine dyes,
Coumarin dyes, anthraquinone dyes, styrylphenyl ketone derivatives having a dialkylamino group, styrylstyryl ketone derivatives, and the like can be mentioned. Examples of radical generators include camphorquinone, diphenyliodonium salts, and biimidazole derivatives. However, when using a diphenyliodonium salt as a radical generator, Counter anions generate strong acids and initiate cationic polymerization reactions. It is necessary to suppress generation of a strong acid by using a counter anion such as The sensitivity of the radical polymerization initiator can be improved by adding amines and mercaptans as hydrogen donors. These radical polymerization initiators are used alone or together with a sensitizer, and
It is added to the photosensitive composition by weight%.

Next, the cationic polymerization initiator used in the present invention will be described. As the initiator of cationic polymerization, non-nucleophilic anions are used in view of their thermal stability. Have been developed and these are preferably used in the present invention.

As such, for example,

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[0027]

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Embedded image And the like.

Although Ar-I ⁺ -Ar X ^- is also useful, since this compound has a high radical polymerization ability as described above, it is necessary to make adjustments such as reducing the amount when using it. or,
The cationic polymerization initiator has sensitivity to the visible light region by using a sensitizing dye such as acridine orange, acridine yellow, phosphine R, benzoflavin, and merocyanine in combination. These initiators are used alone and in combination with a sensitizing dye.
-5% by weight. Having described essential components of the hologram-forming photosensitive recording medium of the present invention, the hologram forming photosensitive recording medium of the present invention, the contrast enhancement, improving thermal stability, purpose of improving film formability It is possible to appropriately use a binder, a plasticizer, a stabilizer and the like according to the conditions. As a binder,
Any organic linear polymer that is compatible with the above essential components may be used. For example, cellulose acetate lactoate polymer; polymethyl methacrylate, acrylic polymers and interpolymers including methyl methacrylate / methacrylic acid and methyl methacrylate / acrylic acid copolymer, methyl methacrylate / acrylic acid or methacrylic acid C ₂ polyvinyl formal and the like; -C ₄ alkyl / terpolymers of acrylic acid or methacrylic acid; polyvinyl acetate; polyvinyl acetal, polyvinyl butyral.

As the plasticizer, triethylene glycol,
Triethylene glycol diacetate, triethylene glycol dipropionate, triethylene glycol dicaprylate, triethylene glycol dimethyl ether, triethylene glycol bis (2-ethylhexanoate), tetraethylene glycol diheptanoate, poly (ethylene glycol ), Poly (ethylene glycol) methyl ether, isopropyl naphthalene, diisopropyl naphthalene, poly (propylene glycol) glyceryl tributyrate, diethyl adipate,
Diethyl sebacate, tributyl phosphate, tris (2-ethylhexyl) phosphate, trade name BR 30 (C ₁₂ H ₂₅ (OCH ₂ CH ₂ ) ₄ OH) and trade name BR 35
[C ₁₂ H ₂₅ (OH ₂ CH ₂ ) ₂₀ OH] and the like. Useful stabilizers include hydroquinone, phenidone, p-methoxyphenol, alkyl and allyl-substituted hydroquinone and quinones, t-butylcatechol, pyrogallol, copper resinate, naphthylamine, beta naphthol,
Examples include cuprous chloride, 2,6-di-t-butyl-p-cresol, phenothiazine, pyridine, nitrobenzene, dinitrobenzene, p-toluquinone, and chloranil.

Next, the operation of the method of forming a volume phase hologram of the present invention using the photosensitive recording medium for forming a hologram of the present invention will be described. First, the above-mentioned essential components used in the present invention and optional additives are dissolved or dispersed in a solvent. Next, this is applied on a support made of glass or transparent resin. After drying, a transparent film of, for example, a polyethylene terephthalate film is laminated thereon as a holding layer (which also plays a role of preventing oxygen).
Next, a laser beam capable of reacting a photopolymerization initiator with respect to the monomer to be selectively polymerized in the medium is irradiated,
A hologram image is formed. Here, the description and the radical polymerization initiator occurs the reaction in the visible light, for example when the reaction with ultraviolet light and a force Luke thio <br/> emissions polymerization initiator in the hologram-forming photosensitive recording medium I do. FIG. 1 shows an example of an exposure optical system used in the process of forming a hologram. First, an interference pattern is exposed with two light beams of object light and reference light of a coherent laser that oscillate light of an appropriate wavelength within the photosensitive wavelength range (visible light) of the radical polymerization initiator. As a result, only the radically polymerizable monomer in the exposed portion selectively polymerizes, and a latent image of the volume phase hologram is formed.

Thereafter, the entire surface of the recording medium is exposed to light (ultraviolet to visible region), for example, a xenon (Xe) lamp, which sensitizes both the radical polymerization initiator and the cationic polymerization initiator. The radical polymerizable monomer and the cationic polymerizable monomer are polymerized respectively. By the above steps, the laser exposed portion is formed only from the polymer of the radical polymerizable monomer, and the other portions are formed from the mixture of the polymer of the radical polymerizable monomer and the polymer of the cationic polymerizable monomer. This causes a refractive index modulation between the two. The hologram thus obtained has a sufficient refractive index modulation, but the refractive index modulation may be further increased by performing an appropriate swelling treatment or a heating treatment as necessary. The condition of the heat treatment at this time is 50 to 150
C., more preferably 30-80 ° C. in a temperature range of 80-120 ° C.
Heating for 120 minutes is preferred. In addition, it is also possible to expose to a Xe lamp prior to exposure to the interference pattern to polymerize the radically polymerizable monomer and the cation polymerizable monomer to some extent.

[0032]

The present invention will be described in more detail with reference to the following examples. Example 1 Each component shown below was chlorobenzene / dichloromethane =
A solution dissolved in a 4/1 mixed solution was applied on a glass substrate, and then dried to obtain a film having a thickness of 10 μm. A radical polymerizable monomer;

Embedded image A cationically polymerizable monomer;

Embedded image A radical polymerization initiator;

Embedded image ・ Camphorquinone 2% by weight

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A cationic polymerization initiator;

Embedded image Binder: PMMA (Elvacite 2041 manufactured by DuPont) 35% by weight Next, a 3.5 μm-thick polyethylene terephthalate film was laminated on this film to obtain a recording medium. Next, an Ar laser (488 nm) was used as a light source for the above-mentioned recording medium by an exposure optical device as shown in FIG.
Exposure is performed using (approximately 200 mJ / cm ² ). Next, the entire surface of the recording medium is exposed for about 10 seconds at a distance of 20 cm from the medium surface using a 500 W Xe lamp. As a result, a volume phase hologram having a diffraction efficiency of 80% and a transmittance of 72% was obtained.

Example 2 In the same manner as in Example 1, a recording medium was formed using the following components. A radical polymerizable monomer;

Embedded image A cationically polymerizable monomer;

Embedded image A radical polymerization initiator;

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Embedded image A cationic polymerization initiator;

Embedded image Using this, the light source in the device shown in FIG.
A hologram was obtained in the same manner as in Example 1 except that the hologram was replaced with a Ne laser. The obtained hologram has a diffraction efficiency of 8
It was a volume phase hologram having a transmittance of 2% and a transmittance of 80%.

Example 3 In the same manner as in Example 1, a recording medium was formed using the following components. A radical polymerizable monomer;

Embedded image A cationically polymerizable monomer;

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A radical polymerization initiator;

Embedded image ・ Cation polymerization initiator: Acridine orange 2% by weight

Embedded image Binder: PMMA (Elvacite 2041, manufactured by DuPont) 21% by weight Using this, a hologram was obtained in the same manner as in Example 1. The obtained hologram was a volume phase hologram having a diffraction efficiency of 75% and a transmittance of 83%. This embodiment is an example in which a cationically polymerizable monomer is selectively polymerized in an interference pattern. Note that an argon laser (488 nm) was used as a light source in the apparatus as shown in FIG.

Example 4 As in Example 1, a hologram was formed using the following components.
A photosensitive recording medium for formation was formed. A radical polymerizable monomer;

Embedded image A cationically polymerizable monomer;

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Radical polymerization initiator 1,3,3,1 ', 3', 3'-hexamethyl-2,2'-indodicarbocyanine, tri-p-methoxyphenylbutyl borate 2% by weight

Embedded image A cationic polymerization initiator;

Embedded image Using this, a hologram was obtained in the same manner as in Example 1. The obtained hologram was a volume phase hologram having a diffraction efficiency of 50% and a transmittance of 85%. Furthermore,
When the hologram was heated at 120 ° C. for 30 minutes,
A volume phase hologram having a diffraction efficiency of 83% and a transmittance of 80% was obtained.

Example 5 The hologram obtained in Example 1 was further heated at 120 ° C.
Heating for 2 hours increased the diffraction efficiency from 80% to 93%.

Examples 6 to 8 The following components were prepared in the same manner as in Example 1 to obtain three types of recording media having different film thicknesses. The thickness of each recording medium was 7 μm in Example 6, 15 μm in Example 7, and 23 μm in Example 8. A radical polymerizable monomer;

Embedded image A cationically polymerizable monomer;

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A radical polymerization initiator;

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Embedded image A cationic polymerization initiator;

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Using the above three types of recording media having different film thicknesses, holograms were obtained in the same manner as in Example 2 thereafter. The diffraction efficiency of the hologram thus obtained was as follows. Example 6 (film thickness; 7 μm); 35% Example 7 (film thickness; 15 μm); 63% Example 8 (film thickness; 23 μm); 80%

Examples 9 to 11 The cationically polymerizable monomer in Example 7 was replaced with the following 3
Exactly as in Example 7 except for substituting the species of compound,
Three types of recording media of Examples 9 to 11 were obtained respectively. Example 9 (cationic polymerizable monomer)

Embedded image Example 10 (cationic polymerizable monomer)

Embedded image Example 11 (cationic polymerizable monomer)

Embedded image Using these three types of recording media, holograms were formed in the same manner as in Example 2, and then each was heated at 100 ° C. for 1 hour. As a result, the diffraction efficiency of the obtained hologram was as follows. Example 9; 87% Example 10; 67% Example 11; 30%

[0044]

As described above, according to the present invention, a photosensitive recording medium for forming a hologram and a volume phase hologram having the following excellent performance can be obtained. It is possible to provide a hologram having high resolution and high diffraction efficiency stably. A large refractive index modulation can be obtained only by the operation of the interference pattern exposure and the entire surface exposure. By selecting a radical polymerization initiator and a cationic polymerization initiator, hologram recording in the visible light range is possible. Hologram type
Storage stability of the formation for the photosensitive recording medium is good. Since the monomer remains a polymer in all regions even after hologram recording, the storage stability (environment resistance) of the hologram itself is good.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating an example of an exposure optical system used for forming a hologram.

Continuing from the front page (72) Inventor Yoshikado Toshida 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Toshiaki Mashima 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Takashi Taniguchi 3-30-2 Shimomaruko, Ota-ku, Tokyo Inside Canon Inc. (72) Inventor Tetsuro Kuwayama 3-30-2 Shimomaruko 3-chome, Ota-ku, Tokyo Inside Canon Inc. References JP-A-4-181944 (JP, A) JP-A-2-9480 (JP, A) JP-A-62-273529 (JP, A) JP-A-62-2253 (JP, A) -75618 (JP, A) JP-A-61-169834 (JP, A) US Patent 3993485 (US, A) US Patent 4,156,035 (US, A) APPLIED OPTICS VOL. 15 NO. 2 1976 p. 534-541 MULTICOMPONENT PH OTOPOLYMER SYSTEMS FOR VOLUME PHASE HOLOGRAMS AND GRAT ING DEVICES (58) Fields surveyed (Int.Cl. ⁶ , DB names)

Claims (31)

(57) [Claims] 1. A la radical polymerizable monomers, cationic polymerizable monomers, by irradiation of a first wavelength region light, the the radical
A radical polymerization initiator for initiating the polymerization of the polymerizable monomer , and irradiation of a second wavelength band light different from the first wavelength band light.
Initiates the polymerization of the cationic polymerizable monomer
A photosensitive recording medium for forming a hologram, comprising a composition containing a cationic polymerization initiator to be formed. 2. The photosensitive recording medium for forming a hologram according to claim 1, further comprising a binder. 3. The hologram-forming photosensitive recording medium according to claim 1, wherein the radical polymerizable monomer is contained at a ratio of 10 to 60% by weight. 4. The hologram-forming photosensitive recording medium according to claim 1, wherein the cationically polymerizable monomer is contained at a ratio of 10 to 60% by weight. 5. The photosensitive recording medium for forming a hologram according to claim 1, wherein both the radical polymerization initiator and the cationic polymerization initiator are photosensitive. 6. The method according to claim 1, which has sensitivity in a wavelength range of visible light.
5. The photosensitive recording medium for forming a hologram according to item 1. 7. The hologram-forming photosensitive recording medium according to claim 1, wherein the photosensitive wavelength ranges of the radical polymerization initiator and the cationic polymerization initiator are different from each other. 8. The hologram-forming photosensitive recording medium according to claim 1, wherein the composition is provided as a coating film on a support. 9. The hologram-forming photosensitive recording medium according to claim 1, which has sensitivity in a wavelength range from ultraviolet light to visible light. 10. The hologram-forming photosensitive recording medium according to claim 1, wherein the radically polymerizable monomer is a monomer having an ethylenically unsaturated double bond in a molecular structure. 11. The hologram-forming photosensitive recording medium according to claim 1, wherein the cationically polymerizable monomer is a monomer having a cyclic ether or a thioether in a molecular structure. 12. The hologram-forming photosensitive recording medium according to claim 1, wherein the radical polymerization initiator is an aromatic ketone or an aromatic diketone. 13. The photosensitive recording medium for forming a hologram according to claim 1, wherein the cationic polymerization initiator is a salt containing a non-nucleophilic anion. 14. The composition according to claim 14, wherein the polymerization initiator is contained in the composition in an amount of from 0.5 to 0.5.
The hologram-forming photosensitive recording medium according to claim 1, which is contained at a ratio of 5% by weight. 15. A method for forming a volume type phase hologram including a step of exposing a photosensitive recording medium to light, a first step of preparing the photosensitive recording medium for forming a hologram according to claim 1; The first wave for
Volume phase which comprises a second step of performing exposure by the long range beam, and a third step of performing a full irradiation Colors light by the photosensitive recording the second wavelength region light to medium A method for forming a hologram. 16. The method according to claim 15, wherein the exposure in the second step is performed using visible light. 17. The method according to claim 15, wherein the exposure in the second step is performed using a coherent laser. 18. The method according to claim 15, wherein the exposure in the third step is performed using ultraviolet light to visible light. 19. The method for forming a volume phase hologram according to claim 15, wherein in the second step, either one of a radical polymerizable monomer and a cationic polymerizable monomer is polymerized. 20. The method of forming a volume phase hologram according to claim 15, wherein, in the third step, both a radically polymerizable monomer and a cationically polymerizable monomer are polymerized. 21. The volume type phase-polymer according to claim 15, wherein in the second step, a radically polymerizable monomer is polymerized, and in the third step, both a radically polymerizable monomer and a cationically polymerizable monomer are polymerized. A method for forming a hologram. 22. A method of forming a volume phase hologram, comprising the step of exposing a photosensitive recording medium, wherein the first step of preparing the photosensitive recording medium for forming a hologram according to claim 1 and a hologram forming step The first wave for
Heating a second step of performing exposure by the long range beam, and a third step of performing a full irradiation Colors light to said photosensitive recording medium by the second wavelength region light, the entire region of the photosensitive recording medium A method of forming a volume phase hologram, comprising: a fourth step. 23. The method according to claim 22, wherein the third step and the fourth step are sequentially performed. 24. The method according to claim 22, wherein the third step and the fourth step are performed simultaneously. 25. The method according to claim 22, wherein the exposure in the second step is performed using visible light. 26. The method of forming a volume phase hologram according to claim 22, wherein the exposure in the second step is performed using a coherent laser. 27. The method of forming a volume phase hologram according to claim 22, wherein the exposure in the third step is performed using ultraviolet light to visible light. 28. The method for forming a volume phase hologram according to claim 22, wherein in the second step, either one of a radical polymerizable monomer and a cationic polymerizable monomer is polymerized. 29. The method for forming a volume phase hologram according to claim 22, wherein, in the third step, both radical polymerizable monomers and cationic polymerizable monomers are polymerized. 30. The volume type phase-forming device according to claim 22, wherein in the second step, a radically polymerizable monomer is polymerized, and in the third step, both a radically polymerizable monomer and a cationically polymerizable monomer are polymerized. A method for forming a hologram. 31. The method for forming a volume phase hologram according to claim 22, wherein the fourth step is performed under a heating condition in a temperature range of 50 to 150 ° C. for 30 to 120 minutes.