Self-focusing and self-trapping in unbiased centrosymmetric photorefractive media.
We predict self-focusing and self-trapping of optical beams propagating in unbiased centrosymmetric photorefractive crystals in the near-transition paraelectric phase, where the nonlinear response is proportional to the square of the diffusion space-charge field.
Crosignani
B
B
Delre
E
E
Di Porto
P
P
Degasperis
A
A