JPS6170573A - Photosensitive material for hologram recording - Google Patents

Abstract

PURPOSE:To make a photosensitive material sensitive to light having longer wavelengths as well as light having shorter wavelengths by combining poly-N- vinylcarbazole as a base with 2,3-bornanedione as a cross-linking agent and a prescribed spectral sensitizer. CONSTITUTION:A photosensitive material recording interference fringes produced by the interference of reference light from a laser light source with object light is composed of poly-N-vinylcarbazole as a base, 2,3-bornanedione as a cross-linking agent and 4-(4'-butoxyphenyl)-2,6-diphenylthiopyrylium fluoroborate as a spectral sensitizer. The photosensitive material for hologram recording is sensitive to light having longer wavelengths as well as light having shorter wavelengths.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the composition of a photosensitive material that records a hologram using a photochemical crosslinking reaction.

A hologram adds reference light to the wavefront coming from the subject to create interference fringes and records them, and a reconstructed image is created by irradiating the reference light as necessary.

The photosensitive material for recording this hologram is generally made by bleaching a conventional photographic material whose main constituent is silver salt, but other materials such as dichromate gelatin and thermoplastics are also used. used as a material.

Here, the necessary conditions for a photosensitive material for hologram recording are high resolution and high sensitivity.

They have excellent moisture resistance, excellent light resistance, and easy hologram formation processing, but all conventional photosensitive materials have -m-shortness. Nothing that meets the requirements has been put into practical use.

In recent years, polyvinylcarbazole-based polymer recording materials for holograms that utilize the high sensitivity of organic halogens have been proposed to satisfy these conditions (for example, Japanese Patent Application Laid-Open No. 53-15153, Japanese Patent Publication No. 54-101343゜1021).
40>.

The present invention relates to Material Composition 6, which improves the properties of such polyvinylcarbazole-based photosensitive materials.

[Conventional technology]

Polyvinylcarbazole materials that have been proposed as meeting the requirements for photosensitive materials for hologram recording use a halogen-containing compound, specifically iodoform (CHr), as a crosslinking agent, and the iodoform is sensitized by light. The crosslinking reaction progresses by generating radicals and substituting the hydrogen atoms of the carbazole ring with CH[2 radicals and the like.

This type of photosensitive material has excellent resolution, sensitivity, and moisture resistance.

Although it has excellent light resistance, it has the fatal drawback of not being sensitive to long wavelengths of 450 nm or more.

In other words, gas lasers such as helium-neon (He-Ne) and argon (Ar) operate stably;
Furthermore, because of its high power, it is generally used as a light source for forming holograms, but the wavelengths of these gas laser beams are all longer than 450 nm.

1 For example, the wavelength of a He-Ne laser is 632
．． 8 nm, and the wavelength of the Ar laser is 488 nm and 5L4.5 nm.

Therefore, such a gas laser cannot be used as a light source, and iodoform does not have a suitable aggravating agent.

[Problem that the invention seeks to solve]

Polyvinylcarbazole-based photosensitive materials have high resolution.

Although it is promising as a material that satisfies the requirements of heat resistance, moisture resistance, and light resistance, the biggest problem is that it lacks sensitivity in the long wavelength region.

[Means for solving problems]

The above problem is due to the fact that the photosensitive material that records interference fringes caused by interference between the reference beam and object beam from the laser light source is
Main material is vinyl carbazole, λ.

Use of a photosensitive material for hologram recording, characterized in that it is formed using 3-bornanedione as a crosslinking material and 4-(4'-butoxyphenyl)-2,6-diphenylthiopyrylium fluoroborate as a spectral sensitizer. This can be solved by

[Effect]

The present invention is based on a polymer having a carbazole ring, such as t-poIJ-N-vinylcarbazole, and a cyclic cis-α-dicarbonyl compound capable of releasing radicals by photolysis, such as 2. It is made to have photosensitivity to long wavelengths by using 3-bornanedione as a crosslinking agent, and the sensitivity is increased by combining this with an exacerbating agent, thereby satisfying all the necessary conditions. This is the result of realizing a photosensitive material.

〔Example〕

The present invention realizes a photosensitive material that is sensitive to light of not only short wavelengths but also long wavelengths, and this effect will be described below with reference to Examples.

Example 1, Boria N-vinylcarbazole (main material) 10g2.
3-bornanedione (crosslinking agent) 2g4- (
4'-Butoxyphenyl)-2゜6-cyphenylthiopyrylium fluoroborate (spectral sensitizer) 0.3 g Chloroform 150 g A photosensitive solution with the above composition was dried on a 70 x 70 x 1 mm glass substrate. After coating in a dark place using a spin code method to a film thickness of 2 μm, the film was dried by heating at 60° C. for 30 minutes to prepare a photosensitive plate for hologram recording.

Using this photosensitive plate, a hologram was recorded using an Ar laser (wavelength: 488 nm) as a light source, and then developed with toluene vapor, immersed in n-pentane, and further air-dried to obtain a hologram.

When the characteristics of this hologram were evaluated, the spatial frequency was 1000 lines/wr, the diffraction efficiency was 72%, and the exposure amount was 300 mJ/cj.

In addition, for a photosensitive plate made with the above composition without adding a spectral sensitizer, the exposure amount required to obtain the same 72% diffraction efficiency was 300 J/oi, proving the remarkable effect of the spectral sensitizer. Ta.

Example 2 A photosensitive plate was prepared in the same manner as in Example 1 using a photosensitive solution having the same composition, and a hologram was obtained using a helium-cadmium (He-Cd) laser (wavelength: 325nIIl).

When the characteristics of this hologram were evaluated, the spatial frequency was 1500 lines/l. The diffraction efficiency was 75%, and the exposure amount was 20 lines/d.

Note that for a photosensitive plate made with the same composition as in Example 1 without adding a spectral sensitizer, the exposure amount required to obtain the same 75% diffraction efficiency was 280 mJ/cIIl, about 10 times more.

From the above, it can be seen that the photosensitive material according to the present invention has high sensitivity not only to long wavelength light but also to short wavelength light.

〔Effect of the invention〕

As described above, the photosensitive material according to the present invention can use any light source such as an Ar laser or a He/Cd laser, and can produce holograms that have a high intensity and meet requirements such as resolution and moisture resistance. be able to.

Claims (1)

[Claims] A photosensitive material that records interference fringes caused by interference between a reference beam from a laser light source and an object beam is made of poly-N-vinylcarbazole as a main material, 2,3-bornanedione as a crosslinking material, and 4-(4'-butoxy). A photosensitive material for hologram recording, characterized in that it is formed using phenyl)-2,6-diphenylthiopyrylium fluoroborate as a spectral sensitizer.