Resonant instability of laser filaments in a plasma

The stability of nonlinear laser light filaments in a homogeneous isotherma l plasma with respect to coupled electromagnetic and density perturbations is examined. In addition to the previously known modulational instability o f trapped electromagnetic mode, a new fast growing resonant instability is found. It corresponds to the growth of an excited eigenmode in the waveguid e formed by the filament density depletion, the associated density response being supersonic and transversally localized. The evolution of the instabi lity is illustrated by numerical simulations in two and three spatial dimen sions.