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Holographic recording material and process for producing holograms
| Details |
Inventors: Ikegami, Kasumi; Okuyama, Hirofumi;
Assignee: Fujitsu Limited (Kawasaki, JP)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
A holographic recording material comprising a polymer containing vinylcarbazole rings, a cyclic cis-.alpha.-dicarbonyl compound capable of forming a radical by light irradiation and a dye as a photosensitizer or a spectral sensitizer. A hologram can be obtained by exposing the holographic recording material to an interference pattern of a radiation to form a holographic interference pattern, subjecting the material to a swelling treatment in a first medium, and then subjecting the material to a contraction treatment in a second medium. |
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DETAILED DESCRIPTION We claim: 1.
A holographic recording material comprising a vinylcarbazole polymer containing carbazolyl rings, a cyclic cis-.
alpha.
-dicarbonyl compound capable of forming a radical by light irradiation and Thioflavine as a photosensitizer or a spectral sensitizer.
2.
A holographic recording material as claimed in claim 1, wherein the Thioflavine dye and the cyclic cis-.
alpha.
-dicarbonyl compound satisfy the following relationships: S.
sub.
1 (cyclic cis-.
alpha.
-dicarbonyl compound)>S.
sub.
1 (sensitizing dye) T.
sub.
1 (sensitizing dye).
gtoreq.
T.
sub.
1 (cyclic cis-.
alpha.
-dicarbonyl compound) in which S.
sub.
1 represents the energy level of the respective excited singlet state and T.
sub.
1 represents the energy level of the respective triplet state.
3.
A holographic recording material as claimed in claim 1, wherein the cyclic cis-.
alpha.
-dicarbonyl compound is 2,3-bornanedione.
4.
A process for producing a hologram, which comprises exposing a sensitive material comprising a vinylcarbazole polymer containing carbazolyl rings, a cyclic cis-.
alpha.
-dicarbonyl compound capable of forming a radical by light irradiation and Thioflavine as a photosensitizer or a spectral sensitizer to an interference pattern of a radiation to form a holographic interference pattern, subjecting the sensitive material having the formed holographic pattern to a swelling treatment in a first medium in which the material is insoluble but which causes said material to swell, and then subjecting the material to a contraction treatment in a second medium which is not a solvent of said material but which causes said material to contract.
Description:
BACKGROUND OF THE INVENTION The invention relates to holography.
Particularly, the invention relates to a holographic recording sensitive material in which the crosslinking reaction of a polymer is to be utilized and to a process for producing holograms with the use of such a sensitive material.
Briefly described, holography is a technique for reproducing a wave front from an object by recording the wavefront with a recording material such as a photographic sensitive material, while irradiating the recorded material with light
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Optical Systems 
