Kazuya HAYATA, Hiroyuki HIGAKI and Masanori KOSHIBA

Department of Electronic and Information Engineering, Hokkaido University, Sapporo, 060 Japan

(Received January 19, 1995; Accepted June 8, 1995)

We show analytically that in the presence of cubic and quintic nonlinearities above a certain critical power, multidimensional optical solitary waves could propagate stably in bulk media. To investigate the stability an analytical expression for the solitary-wave fields with an arbitrary transverse dimension is derived through the combined use of Galerkin's method and self-consistent-field approximation.

Key words : optical soliton, spatial soliton, two-dimensionally self-trapped beam, cubic-quintic nonlinearity, stability analysis