Stability and Transient Effects in Ultraviolet Filaments

摘要: Abstract : Short, high intensity laser pulses induce nonlinear optical effects in the atmosphere that have potential to make them propagate for long distances. Applications distance propagation of short include active spectral remote sensing and lightning control. Much work this field has been done with infrared pulses; however, it proposed ultraviolet advantage longer pulse lengths can be used, thereby delivering more energy. Long lead a simplified instantaneous model plasma response, which shown by Schwarz Diels admit steady state or oscillatory solutions corresponding beam propagation. We verified adjusted achieve closer agreement numerical results. In we investigate transient behavior, stability these solutions. Analysts modulational instability is from plane wave level full three dimensional It both behavior arising finite length, cause fragment over on scale meters. present results showing growth unstable modes various regimes. discuss pertinent length scales pulses, as well impact theory experiment. The imply continuous models are very limited when used predict dynamical properties (4 tables, 24 figures, 62 refs.)