Abstract
The propagation characteristics of a focused laser beam in a SBN:75 photorefractive crystal strongly depend on the signal-to-background intensity ratio () under reverse external electric field. In the range , the laser beam shows enhanced self-defocusing behavior with increasing external electric field, while it shows self-focusing in the range . Spatial solitons are observed under a suitable reverse external electric field for . A theoretical model is proposed to explain the experimental observations, which suggest a new type of soliton formation due to “enhancement” not “screening” of the external electrical field.
© 2014 Optical Society of America
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