title: Breathing spatial solitons in non-Kerr media.
abstract: The concept of soliton internal mode is introduced to explain quantitatively the long-lived oscillations of self-guided beams, or breathing spatial solitons. Cubic-quintic nonlinearity is considered in detail, and it is shown that the existence of the internal mode affects strongly the beam propagation in non-Kerr media, leading to oscillatory dependence of the output width of the beam versus its input power.
authors.forename: V V
authors.initials: VV
authors.lastname: Afanasjev
authors.forename: P L
authors.initials: PL
authors.lastname: Chu
authors.forename: Y S
authors.initials: YS
authors.lastname: Kivshar