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Photo-induced absorption effects in photorefractive polymer materials.

Several different types of polymer thin films demonstrate photorefractive properties. Some of these materials also exhibit a change in their optical properties when exposed to laser light. We examined thin film (100-200 micron thick) Methine dye polymers, PVK/PDCST/BBP/[C.sub.60] polymer blend samples and PVK/TCP/NPP/[C.sub.60] polymer blend samples. The samples were exposed to visible and near infra-red laser light with intensities up to approximately 1200 mW/[cm.sub.2]. Methine dye samples demonstrated an absorption which increased with both time and beam intensity when exposed to light. The PVK/TCP/N-PP/[C.sub.60] polymer blend samples demonstrated a similar short term photo-absorption effect and also a long term, permanent increase in absorption as it was exposed to the laser. The PVK, PDSCT/BBP/[C.sub.60] samples did not exhibit any photo-induced absorption effects.

Thomas M. Christensen * (1) and F. Ghebremichael (2). (1) Department of Physics, University of Colorado, Colorado Springs; (2) Department of Physics, U.S. Air Force Academy.

* Denotes membership in the Colorado-Wyoming Academy of Science.
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Author:Christensen, Thomas M.; Ghebremichael, F.
Publication:Journal of the Colorado-Wyoming Academy of Science
Article Type:Brief Article
Geographic Code:1USA
Date:Apr 1, 2002
Words:177
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