Photorefractive polymer in reflection geometry with large efficiency
Conference
Eralp, M, Thomas, J, Tay, S et al. (2006). Photorefractive polymer in reflection geometry with large efficiency
. Proceedings of SPIE - The International Society for Optical Engineering, 6331 10.1117/12.702834
Eralp, M, Thomas, J, Tay, S et al. (2006). Photorefractive polymer in reflection geometry with large efficiency
. Proceedings of SPIE - The International Society for Optical Engineering, 6331 10.1117/12.702834
Eralp, M; Thomas, J; Tay, S; Li, G; Norwood, R; Peyghambarian, N
abstract
We have investigated photorefractive (PR) properties of a polymer composite with low glass-transition temperature (T g) in a symmetric reflection geometry. A diffraction efficiency of more than 30% is observed in 105μm thick devices. In low T g photorefractive polymers, poling of the nonlinear optical chromophores at room temperature leads to birefringence in the material. The birefringence will alter the Bragg condition, as the propagation vectors for object and reference beams as well as the readout angle are influenced We observed the Bragg-mismatch effect that caused a reduction in diffraction efficiency as the external field is increased. We have varied the angle of readout beam slightly at each bias field to get the highest efficiency.
