Abstract
Channeling of a train of laser pulses into dense plasma is studied using particle-in-cell simulation. When the pulse duration and the interval between the successive laser pulses are appropriately chosen, the laser pulse train can bore into the plasma deeper than a single long-pulse laser of similar peak intensity and total energy, and laser-induced plasma instabilities are greatly suppressed by the intermittent laser-energy cut-offs. The increased penetration distance can be attributed to the repeated application of ponderomotive force, the greatly reduced plasma instabilities, as well as the continuous between-pulse plasma channel expansion due to ion inertia.
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