Second Harmonic Generation Accompanied by the Formation of Intense Light Bullets

A possibility of the formation of a two-frequency light bullet in the second harmonic generation regime is analytically studied taking into account the focusing Kerr nonlinearity. It has been demonstrated that a stable light bullet with an upper limit on its intensity, as well as lower limits on time duration and aperture, can be formed under conditions of phase and group matching and the absence of group velocity dispersion at the second harmonic frequency.