Phase modulation spectroscopy of space-charge wave resonances in Bi12SiO20

M. Vasnetsov, Preben Buchhave, S. Lyuksyutov

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A new experimental method for the study of resonance effects and space-charge wave excitation in photorefractive Bi12SiO20 crystals by using a combination of frequency detuning and phase modulation technique has been developed. The accuracy of the method allows a detection of resonance peaks of diffraction efficiency within 0.5 Hz. Numerical simulations of the nonlinear differential equations describing the behaviour of the space-charge waves in photorefractive crystals have been performed and found to be in a good agreement with experiment. We have measured the photocurrent through the crystal and revealed its resonance dependence. A minimum of electric current through the sample corresponds to the main resonance detected by phase modulation technique.
Original languageEnglish
JournalOptics Communications
Pages (from-to)181-191
Publication statusPublished - 1997

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