Reversibility of laser filamentation
  We investigate the reversibility of laser filamentation, a self-sustained, non-linear propagation regime including dissipation and time-retarded effects. We show that even losses related to ionization marginally affect the possibility of reverse propagating ultrashort pulses back to the initial conditions, although they make it prone to finite-distance blow-up susceptible to prevent backward propagation. 
Nicolas Berti and Wahb Ettoumi and J\'er\^ome Kasparian and   Jean-Pierre Wolf
physics.optics nlin.CD