JPH0229773A - Production of hologram - Google Patents

Abstract

PURPOSE:To enhance transparency and environmental resistance and to allow the production of a hologram under visible rays by coating a substrate with a hologram photosensitive material and irradiating the entire surface of the substrate with UV rays, then exposing with electron rays, thereby recording interference fringe patterns on the surface. CONSTITUTION:The entire surface of the substrate on which the recording material is coated is previously irradiated with the UV rays to crosslink a high polymer which is an essential material; thereafter, the surface is subjected to a decoloring treatment to elute the org. halogen compd. of the crosslinking agent and the dye of a sensitizer, by which the dry plate is formed. This dry plate is nonphotosensitive to visible rays. The dry plate is irradiated with electron rays by an electron ray exposing device along the desired interference fringe patterns previously obtd. by calculation. The interference fringes are thus recorded by utilizing the decrease in the mol. wt. of the recording material.

Description

[Detailed Description of the Invention] [Summary] The purpose of the present invention is to provide a method for producing a hologram that can be produced under visible light, using a high molecular weight polymer, a halogen compound or peroxide, and a dye. A mixture of the following is used as a hologram photosensitive material, the hologram photosensitive material is coated on a substrate, the entire surface of the substrate is irradiated with ultraviolet rays, and then exposed to an electron beam to record an interference fringe pattern.

(Industrial Application Field) The present invention relates to a method for producing a hologram.More specifically, in a hologram that uses the coherence of light and other waves to record signal waves emitted from an object onto a photosensitive material, a computer This paper relates to a method for producing a computer-generated hologram in which a signal wave determined by the method is written into a hologram.

In recent years, holograms have developed as a technology that not only records and reproduces coherent light such as lasers, but also spatially controls the optical wavefront itself, and is used as an optical element in diffraction gratings, laser beam scanners, lenses, combiners, etc. It is being When a hologram is used as an optical element, reproduction light that can stably produce high output and has an excellent coherence length is desirable, and relatively inexpensive He--Ne lasers are mainly used.

[Conventional technology]

Conventionally, as photosensitive materials for hologram recording, materials prepared by bleaching silver salt used in ordinary photographic materials and dichromate gelatin have been used.

However, although these silver salts and dichromate gelatin have high sensitivity in almost the entire visible light range, they use a gelatin film as a binder, so they have low environmental resistance such as moisture resistance, heat resistance, and light resistance. There is a problem.

As a recording material improved in these respects, a polymer hologram recording material has been proposed, which uses a polymer as a main ingredient, an organic halogen compound or peroxide as a crosslinking agent, and a dye as a sensitizer. It is desirable to use light with a small wavelength difference from the reproduction light for the recording light of this polymer hologram recording material in order to suppress chromatic aberration, but the photosensitive region of the polymer hologram recording material is in the ultraviolet region and Ar laser light is used because the sensitivity decreases as the wavelength increases.

When producing a hologram using this polymer hologram recording material, an Ar laser beam is irradiated onto a glass substrate coated with the recording material along an interference fringe pattern calculated in advance.

At this time, in the exposed region, radicals generated by photodecomposition of the dye by laser beam irradiation decompose the organic halogen compound (or peroxide). Decomposed organic halogen compounds (
or peroxide) is ionized and crosslinks the main polymer, increasing its molecular weight, thereby increasing the refractive index and decreasing the rate of dissolution in the solvent.

After that, a decoloring process is performed to elute the crosslinking agent and sensitizer, and then a development process is performed using the difference in dissolution rate in the solvent between the exposed area and the non-exposed area caused by the crosslinking reaction. After the exposed area is swollen or almost dissolved, it is immersed in a non-solvent to obtain a refractive index difference due to its shrinkage effect, thereby forming a hologram.

[Problem to be solved by the invention]

The polymer hologram recording material is an extremely excellent hologram recording material with excellent moisture resistance, heat resistance, light sensitivity, light diffraction efficiency, and high resolution, but it has high sensitivity in the entire visible light range. Therefore, there is a problem in that the production of holograms requires a lot of time and effort because all of the production must be performed in a dark room that blocks visible light.

An object of the present invention is to provide a method for producing a hologram that is transparent, has excellent environmental resistance, and can be produced under visible light.

[Means to solve the problem]

The above object is to prepare a hologram photosensitive material from a mixture consisting of a high molecular weight polymer, an organic halogen compound or peroxide as a crosslinking agent, and a dye as a sensitizer, apply the hologram photosensitive material to a substrate, and then apply the hologram photosensitive material to a substrate. This is achieved by a hologram manufacturing method characterized by irradiating the entire surface with ultraviolet rays and then exposing the entire surface to electron beams to record an interference fringe pattern.

Here, the high molecular weight polymer is acrylic.

Acrylonitrile type, amide type, ester type, olefin type, divinylbenzene type, styrene type.

Vinylidene-based, vinyl-based, vinylcarbazole-based.

Examples include butadiene-based polymers and copolymers thereof.

Examples of the crosslinking agent include iodine-based, chlorine-based, and bromine-based organic halogen compounds, and peroxides such as hydroperoxide-based, diacyl peroxide-based, and peroxyester-based.

The sensitizer is triallylcarbonium.

These include cyanine bases, bilinium bases, and fused polycyclic aromatics.

[Effect]

In the hologram manufacturing method of the present invention, the entire surface of the substrate coated with the recording material is irradiated with ultraviolet rays in advance to crosslink the main ingredient, the polymer, and then decolorized to remove the organic halogen compound (crosslinking agent). or peroxide) and the dye, which is a sensitizer, are eluted to prepare a dry plate. This plate is photosensitive to visible light and can be handled under normal environments. Thereafter, this dry plate is irradiated with an electron beam using an electron beam exposure device along a desired interference fringe pattern calculated in advance, and interference fringes are recorded by utilizing the decrease in the molecular weight of the recording material.

That is, in the exposed area, the crosslinks are broken by electron beam irradiation, the molecular weight of the recording material decreases, and the refractive index and solvent resistance decrease accordingly. It is thought that after being in a dissolved state, it is immersed in a non-solvent and a difference in refractive index is obtained due to the shrinkage effect of the non-solvent, thereby forming an interference pattern.

In this way, according to the present invention, it is possible to provide a method for producing a hologram that can be produced under visible light.

〔Example〕

Next, a first embodiment of the present invention will be described.

Polyvinyl-N-methoxycarbazole Lo as main agent
A hologram recording material was prepared by mixing g, 1 g of iodoform as a crosslinking agent, and 0.1 g of rubrene as a filler, and 40 g of monochlorobenzene and 4 g of dichlorobenzene were mixed.
0 g and 40 g of tetrahydrofuran are dissolved in a mixed solvent to prepare a photosensitive solution. In a dark room that blocks visible light, the photosensitive solution was prepared with a size of 50 mm + x 5 Q m and a thickness of 1 l1.
The recording material was coated on a glass substrate No. 111 by a spin code method and dried to form a photosensitive plate for hologram having a film thickness of 5 μm.

Thereafter, the entire surface of the hologram photosensitive plate was exposed to ultraviolet light, immersed in a mixed solution of toluene and xylene for 5 minutes, and then air-dried.

Next, an interference fringe pattern was drawn on the hologram photosensitive plate at an exposure dose of 100 μC/cm'' using an electron beam exposure device in a laboratory under visible light, and after immersing it in a toluene/xylene mixed solution, N-pentane As a result of immersion in the liquid, a hologram with a diffraction efficiency of 50% was formed.

Next, a second example of the present invention will be described. 10 g of polymethyl methacrylate as the main agent, 1 g of dimethyldibenzoylperoxyhexane as the crosslinking agent, and 0.0 g of diphenylthiopyrylium verchlorate as the sensitizer.
A hologram recording material is prepared by mixing 1 g of 1 g of the hologram, and a photosensitive solution is prepared by dissolving it in a solvent containing 40 g of monochlorobenzene, 40 g of dichlorobenzene, and 40 g of tetrahydrofuran.

Hereinafter, in the same way as in the first example, in a dark room where visible light is blocked, this photosensitive solution is spin-coded onto a glass substrate with a size of 50 m x 50 m and a thickness of 1III11, and dried to form a hologram with a thickness of 5 μm. A photosensitive plate was formed, the entire surface was exposed to ultraviolet light, immersed in a mixed solution of toluene and xylene for 5 minutes, air-dried to form a dry plate, and then exposed to 100 μC/cm using an electron beam exposure device in a laboratory under visible light. An interference fringe pattern was drawn on the photosensitive plate for hologram with an exposure amount of 100%, and the plate was immersed in a mixed solution of toluene and xylene, and then immersed in N-pentane. As a result, a hologram with a diffraction efficiency of 47% was formed.

As described above, in the hologram manufacturing method of the present invention, the entire surface of the photosensitive plate for hologram is irradiated with ultraviolet rays in advance to crosslink the polymer of polyvinyl-N-methoxycarbazole (or polymethyl methacrylate), which is the main ingredient, and then A dry plate is prepared by decolorizing to elute the crosslinking agent iodoform (or dimethyldibenzoyl peroxyhexane) and the sensitizer rubrene (or diphenylthiopyrylium verchlorate), and then irradiated with an electron beam. to record the interference fringe pattern.

Since the dry plate produced at this time is insensitive to visible light, the present invention can provide a method for producing a hologram that can be performed under visible light as described above.
The process can be simplified. Furthermore, since the decolorization process is performed after the entire surface of the hologram photosensitive plate is exposed, there is an advantage that the film thickness can be made constant.

〔Effect of the invention〕

According to the present invention, the entire surface of the photosensitive plate for holograms is exposed to light to make it insensitive to visible light, and then exposed to electron beams to record an interference fringe pattern, so that holograms can be produced under visible light. This simplifies the manufacturing process, and since the decolorization process is performed after the entire surface of the hologram photosensitive plate is exposed, the film thickness of the recording material becomes constant, which is effective in manufacturing better holograms.

Claims (1)

[Scope of Claims] A mixture of a high molecular weight polymer, an organic halogen compound or peroxide, and a dye is used as a hologram photosensitive material, and the hologram photosensitive material is applied to a substrate, and the entire surface of the substrate is irradiated with ultraviolet rays. , a method for producing a hologram, characterized by recording an interference fringe pattern through electron beam exposure.