Quantification of the physical parameters of the stored hologram in photorefractive polymer composites

Shakos, John D.; Rahn, Mark D.; West, David P.; Khand, Kaleemullah

doi:doi:10.1117/12.348396

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Proceedings / Volume 3623 / Photorefractive Polymers

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Quantification of the physical parameters of the stored hologram in photorefractive polymer composites

Proc. SPIE 3623, 175 (1999); http://dx.doi.org/10.1117/12.348396

Monday 25 January 1999

San Jose, CA, USA

Organic Photonic Materials and Devices

Bernard Kippelen

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Abstract

John D. Shakos, Mark D. Rahn, David P. West, and Kaleemullah Khand

Univ. of Manchester (United Kingdom)

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.

History

Online May 28, 2003

Digital Object Identifier

http://dx.doi.org/10.1117/12.348396

Citation

John D. Shakos, Mark D. Rahn, David P. West and Kaleemullah Khand, "Quantification of the physical parameters of the stored hologram in photorefractive polymer composites", Proc. SPIE 3623, 175 (1999); http://dx.doi.org/10.1117/12.348396