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11 November 1999 Photochromic materials for holographic data storage
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Proceedings Volume 3897, Advanced Photonic Sensors and Applications; (1999)
Event: International Symposium on Photonics and Applications, 1999, Singapore, Singapore
Photochromism and real-time holographic recording were characterized for two principal classes of photochromic compounds: spiropyrans and fulgides. For spiropyran molecules, important thickness and writing intensity effects were observed. Concerning fulgide, in PMMA matrix, the closed form presents a maximum of absorption centered at 525 nm upon irradiation at 365 nm. We have determined the photoreaction rate constants kUV and kvis respectively for the coloring and bleaching process: kUV equals 1.2 X 10-3 s-1 and kVIS equals 11.1 X 10-3 s-1. Photochemical fatigue resistance in different polymer matrices was investigated. We found a loss of 9, 11, 13 and 35 percent respectively in PS, CA, PMMA and PVK. Concerning holographic recording, we obtained diffraction efficiency (eta) equals 0.65 percent in PMMA films 30 micrometers thick.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Roger A. Lessard, Christophe Lafond, Fatima Ghailane, Michel Bolte, Amir Tork, and Ivan Petkov "Photochromic materials for holographic data storage", Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999);

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