Variational approach to laser pulse compressions by an electron plasmawave,

摘要

Abstract: Variational approach is adopted to study the evolution of an ultrashort laser pulse copropagating with an electron plasma wave. By use of the potential well description, the conditions for pulse compression, decompression or stationary state are found, which are results of the competitions between the dispersive diffusion and phase modulation of the pulse by the plasma wave. Results are compared with the numerical calculations of the evolution equation to prove the applicability of the above approximate method.!13