title: Resonant two-wave mixing in photorefractive materials with the aid of dc and ac fields.
abstract: 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.
authors.forename: V A
authors.initials: VA
authors.lastname: Kalinin
authors.forename: K
authors.initials: K
authors.lastname: Shcherbin
authors.forename: L
authors.initials: L
authors.lastname: Solymar
authors.forename: J
authors.initials: J
authors.lastname: Takacs
authors.forename: D J
authors.initials: DJ
authors.lastname: Webb