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25 September 2013 Enhanced gain dynamics in photorefractive polymers
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The complexity of photorefractive polymers arises from multiple contributions to the photo-induced index grating. Analysis of the time dynamics of the two-beam coupling signal is used to extract information about the charge species responsible for the grating formation. It has been shown in a commonly used photorefractive polymer at moderate applied electric fields, the primary charge carriers (holes) establish an initial grating which, however, are followed by a subsequent competing grating (electrons) that decreases the two-beam coupling efficiency. We show by upon using higher applied bias fields, gain enhancement can be achieved by eliminating the electron grating contribution and returning to hole gratings only.
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C. M. Liebig, S. Basun, S. S. Buller, D. R. Evans, P. P. Banerjee, P. A. Blanche, C. W. Christenson, N. Peyghambarian, and J. Thomas "Enhanced gain dynamics in photorefractive polymers", Proc. SPIE 8847, Photonic Fiber and Crystal Devices: Advances in Materials and Innovations in Device Applications VII, 88470A (25 September 2013);

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