Critical slowing down of space-charge field relaxation in photorefractive sillenites.
We propose a theoretical model for the recently reported anomalously long decay of a space-charge field that was resonantly excited in a photorefractive sillenite crystal [Phys. Rev. Lett. 79, 67 (1997)]. The model is based on the conventional concept of charge transfer and does not require excessively large values of the quality factor for space-charge waves. The effect in question is qualified as a critical slowing of the relaxation process as the threshold of optical oscillation is approached.
Sturman
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BI
Podivilov
E V
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Pedersen
H C
HC
Johansen
P M
PM