18 May 1999 Quantification of the physical parameters of the stored hologram in photorefractive polymer composites
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The local field within a reorientational photorefractive polymer composite has been estimated to be 2.2 times the applied poling field. Using a transmission ellipsometric technique the birefringence within a pulsed photorefractive polymer material has been measured as a function of applied field. The birefringence at an internal poling field of 110 Vmicrometers -1 is 4 X 10-3. By equating the sum of the poling field and the space-charge field formed within a hologram to the birefringence dependency on field and the holographic contrast obtained in a four wave mixing experiment, the amplitude of the space-charge field has been found. Its values are between 7.8 and 15 Vmicrometers -1, depending on the ratio of reorientation and the Pockels contributions to the birefringence. In this regime the holographic contrast is limited by the trap density which is found to be between 7.4 X 1015 and 15.7 X 1015 cm-3.
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John Dimitri Shakos, John Dimitri Shakos, Mark D. Rahn, Mark D. Rahn, David P. West, David P. West, Kaleemullah Khand, Kaleemullah Khand, } "Quantification of the physical parameters of the stored hologram in photorefractive polymer composites", Proc. SPIE 3623, Organic Photonic Materials and Devices, (18 May 1999); doi: 10.1117/12.348396; https://doi.org/10.1117/12.348396

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