We investigate spatial optical solitons propagating in a medium with a saturable but adjustable nonlinearity and a fixed degree of nonlocality. We employ nematic liquid crystals in a planar cell with optical properties tuned by an external voltage and solitons excited in the near infrared. We also demonstrate soliton self-bending versus excitation due to nonlinear variations in walk-off. A theoretical model accounting for the longitudinal derivatives is employed to compute the refractive index distribution and is found in excellent agreement with the experimental data.
Alberucci, A., Piccardi, A., Peccianti, M., Kaczmarek, M., Assanto, G. (2010). Propagation of spatial optical solitons in a dielectric with adjustable nonlinearity. PHYSICAL REVIEW A, 82(2) [10.1103/PhysRevA.82.023806].