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Proceedings Paper

Photochromic materials for holographic data storage
Author(s): Roger A. Lessard; Christophe Lafond; Fatima Ghailane; Michel Bolte; Amir Tork; Ivan Petkov
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Paper Abstract

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.

Paper Details

Date Published: 11 November 1999
PDF: 10 pages
Proc. SPIE 3897, Advanced Photonic Sensors and Applications, (11 November 1999); doi: 10.1117/12.369293
Show Author Affiliations
Roger A. Lessard, COPL/Univ. Laval (Canada)
Christophe Lafond, COPL/Univ. Laval (Canada) and Univ. Blaise Pascal (Canada)
Fatima Ghailane, COPL/Univ. Laval (Canada)
Michel Bolte, Univ. Blaise Pascal (France)
Amir Tork, Univ. Laval (Canada)
Ivan Petkov, Univ. of Sofia (Russia)


Published in SPIE Proceedings Vol. 3897:
Advanced Photonic Sensors and Applications
Robert A. Lieberman; Anand Krishna Asundi; Hiroshi Asanuma, Editor(s)

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