968 resultados para AC and DC conductivities
Resumo:
"November 1966."
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"October 1967."
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"June 1967."
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Includes index.
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"September 1970."
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"December 1968."
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"February 1967."
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"March 1969."
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"August 1963."
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"1 August 1979."
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"August 1976."
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"March 1973."
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Includes index.
Resumo:
"November 1970."
Resumo:
A recently predicted resonant effect for the enhancement of two-wave mixing in photorefractive materials is investigated. The resonance occurs when the frequency of the applied ac field agrees with the eigenfrequency of the excited space-charge wave. Experimentally a clear resonance is found, as predicted by the theory, for high dc electric fields, but the resonance is smeared out for lower fields. A modified theory, taking into account the second temporal harmonic of the space-charge wave, shows good agreement with the experimental results.