Paper
6 October 2006 Photorefractive polymer in reflection geometry with large efficiency
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Abstract
We have investigated photorefractive (PR) properties of a polymer composite with low glass-transition temperature (Tg) in a symmetric reflection geometry. A diffraction efficiency of more than 30% is observed in 105μm thick devices. In low Tg 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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Muhsin Eralp, Jayan Thomas, Savaş Tay, Guoqiang Li, Robert Norwood, and Nasser Peyghambarian "Photorefractive polymer in reflection geometry with large efficiency", Proc. SPIE 6331, Linear and Nonlinear Optics of Organic Materials VI, 63310B (6 October 2006); https://doi.org/10.1117/12.702834
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KEYWORDS
Diffraction

Reflection

Diffraction gratings

Polymers

Photorefractive polymers

Refractive index

Chromophores

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