The detailed theoretical investigation of the charge carrier transport in the crystals with shallow traps under applied square-wave ac field was carried out. It was found that under certain conditions the charge gratings on the deep donors and the shallow traps are in counter-phase to each other. Prevailing of the recombination mechanism of the charge grating formation over the photoexcitation mechanism is responsible for the counter-phase charge grating formation on the shallow traps. Formation of the counter-phase charge-gratings leads to such important effects as: latent storage of the recorded hologram under uniform illumination without the applied field and latent continuous recording of the charge gratings.
© 2001 Optical Society of America
O. Kobozev and A. A. Kamshilin, "Counter-phase charge gratings in crystals with shallow traps," in Photorefractive Effects, Materials, and Devices, G. Salamo and A. Siahmakoun, eds., Vol. 62 of OSA Trends in Optics and Photonics (Optical Society of America, 2001), paper 521.
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