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Photorefractivity with nondestructive readout at near-infrared wavelengths

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Abstract

Photorefractive polymers for dynamic holography applications are rapidly improving. The reversible nature of photorefractivity results in erasing of the photorefractive grating by uniform illumination, typically the reading beam. Recently, we successfully demonstrated non-destructive readout in photorefractive materials utilizing two-photon absorption (TPA) sensitization by a chromophore blended into the polymer material [1]. TPA occurs at high peak intensities during the writing process with short pulses while the readout is performed at much lower light intensities for which the material is transparent. To apply this idea at near-infrared wavelengths the two-photon sensitivity spectrum of the chromophore must be shifted to longer wavelength and a suitable polymer host material has to be developed. In our study, we report on characterization of novel electro-active chromophores with high TPA cross sections and study the feasibility of the composite polymeric material for NIR photorefractivity.

© 2003 Optical Society of America

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