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The investigation of the photorefractive effect in crystals Pb5Ge3O11:Cu and Pb5Ge3O11 that we started earlier is continued. The lead germanate crystal doped by copper demonstrated the photorefractive properties at the wavelength of 496.5 nm with diffraction efficiency of the recorded hologram of 0.4%. The crystal Pb5Ge3O11 exhibited the photorefractive effect at the wavelength 496.5 nm and 514.5 nm. In this case the grating diffraction efficiency was 5.3%. As for two investigated crystals the total intensity of writhing beams kept at the level of 100 mW/cm2. There was no external electric field applied to crystals. We studied the temporal characteristics of recording and of erasure of holographic gratings and the crystal response time as a function of the total light intensity.
L. D. Pryadko,O. Gnatovsky,T. I. Semenets, andV. G. Linnik
"Study of the photorefractive effect in crystals Pb5Ge3O11:Cu and Pb5Ge3O11", Proc. SPIE 2795, Nonlinear Optics of Liquid and Photorefractive Crystals, (29 April 1996); https://doi.org/10.1117/12.239207
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L. D. Pryadko, O. Gnatovsky, T. I. Semenets, V. G. Linnik, "Study of the photorefractive effect in crystals Pb5Ge3O11:Cu and Pb5Ge3O11," Proc. SPIE 2795, Nonlinear Optics of Liquid and Photorefractive Crystals, (29 April 1996); https://doi.org/10.1117/12.239207