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