Abstract
The photorefractivity of a sol-gel glass was investigated using two-beam-coupling(TBC), degenerate-four-wave-mixing(DFWM), and phase shifting methods. The sol-gel glass was prepared by introducing the following photorefractive elements in the polyethyleneglycol matrix: TNF, SG-Cz, and SG-MN were used as charge generator, charge transporter, and electrooptic material, respectively. TBC gain of 90 cm−1and diffraction efficiency of 46%were obtained at 107 V/μm field. Also we measured the grating build-up and relaxation characteristics. The holographic phase shift was measured to be 51°at 107 V/μmfield. In order to compare this photorefractive sol-gel glass with inorganic photorefractive crystal, we measured the photorefractive properties of Fe:LiNbO3. As a result, we obtained the TBC gain of 50 cm−1, the diffraction efficiency of 47%, and the phase shift of 90°for Fe:LiNbO3sample.
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