The influence of an external electric field on the propagation of a one-dimensional odd dark beam in a cubic optically active photorefrac-tive piezocrystal Bi_{12}SiO_{20} with thickness of 10 mm is studied experimentally and theoretically. It is established that taking into account the piezoelectric effect at numerical modeling leads to better adequacy of the experimental and theoretical results.

Keywords: soliton, the dark beam, photorefractive piezocrystal.

Zh.V. Kolyadko – I.P. Shamyakin Mozyr State Pedagogical University, Mozyr, Belarus

V.V. Shepelevich – I.P. Shamyakin Mozyr State Pedagogical University, Mozyr, Belarus

S.F. Nichiporko – I.P. Shamyakin Mozyr State Pedagogical University, Mozyr, Belarus

S.M. Shandarov – Tomsk State University of Control Systems and Radioelectronics, Tomsk, Russia