Study on Interaction of Photorefractive Spatial Solitons Using Perturbative Variational Approach

The coherent interaction of photorefractive spatial screening solitons is investigated using perturbative variational approach.The position and period of first collision of in-phase solitons in the photorefractive crystal are obtained.The physics mechanism of the interaction of in-phase or out-phase solitons is analyzed.The results show that the interaction will occur when the tail of solitons is overlapped.The magnitude of interaction force is relative to the intensity and relative distance of the solitons,and the electric field biased in the photorefractive crystal.The distance between two solitons will decrease with the increase of the intensity of solitons which will become much more powerful with the increase of the biased electric field.The quality of the force is relative to the initial phase difference.Interaction of the in-phase solitons appears to attract each other,and interaction of the π out of phase solitons appears to repel each other.