Fully transparent non-dilute polydiene solutions exhibit optical nonlinearities when irradiated by low power cw laser in the visible. The formation of optical spatial solitons is imaged through phase contrast microscopy. Both (2+1)D and (1+1)D modulational instabilities are evidenced as 2D and 1D arrays of linear filaments formed by beam defocusing or using a cylindrical lens. The origin of the non linearity remains elusive.
S. Pispas NHRF
R. Sigel, Uni Fribourg
N. Vainos NHRF
HJ Butt, MPI Polymer Research Mainz