Overcoming the Child Langmuir law via Pondermotive Potential of the   intense lasers
  The maximum current that could be carried in a vacuum tube is given by the so-called Child Langmuir law. A scheme where this limit could be overcome via the pondermotive potential is proposed. The estimation shows that the limit could be overcome by a couple of hundred percents. 
S. Son and S. J. Moon
physics.plasm-ph