New developing process for PVCz holograms

Yasuo Yamagishi; Takeshi Ishitsuka; Yohko Kuramitsu; Yasuhiro Yoneda

doi:10.1117/12.44712

1 July 1991 New developing process for PVCz holograms

Yasuo Yamagishi, Takeshi Ishitsuka, Yohko Kuramitsu, Yasuhiro Yoneda

Proceedings Volume 1461, Practical Holography V; (1991) https://doi.org/10.1117/12.44712
Event: Electronic Imaging '91, 1991, San Jose, CA, United States

Abstract

The authors investigate a developing process for volume holograms consisting of poly-N- vinylcarbazole (PVCz), and achieve a new process that enables high diffraction efficiency, large holograms and uniform quality. Conventionally PVCz holograms are developed by two sequential dipping processes: first into good solvent, then into poor solvent. When a swollen PVCz film is dipped into poor solvent, PVCz molecules precipitate into small grains, and micro-gaps between grains are formed corresponding to the degree of swelling. As the result of the difference in swelling between highly exposed and low exposed areas, refractive index modulation appears. In this process, it is difficult to obtain a large hologram, because the upper area dries more than the lower area when the swollen film is carried to poor solvent. Based on the investigation above, the authors found a new process where the holograms are developed by a single dipping process into a mixture of volatile good solvent and nonvolatile poor solvent. The hologram film swells with the mixture, and is then carried out slowly from the tub. The solvent mixture in the film becomes poor solvent, rich and small grains are formed, because a good solvent evaporates more quickly than a poor solvent. With this new process all areas of a hologram plate can be developed under same conditions, so large holograms with uniform quality become possible.

Citation Download Citation

Yasuo Yamagishi, Takeshi Ishitsuka, Yohko Kuramitsu, and Yasuhiro Yoneda "New developing process for PVCz holograms", Proc. SPIE 1461, Practical Holography V, (1 July 1991); https://doi.org/10.1117/12.44712

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