Abstract
For a radiation pulse with incidence normal to an incoming plasma front, the reflective index at the front of the plasma serves as a reflector. A description is given of the up-shift frequency of the radiation pulse and the reflection coefficient developments with different plasma densities from an initial state to saturation and decaying are studied. The results show that the reflection coefficient is closely correlated both to the velocity of the plasma front and the amplitude of the Langmuir wave. We obtained reflection coefficients that are larger than those from a moving mirror at the same speed. However, at special points the reflection coefficient is independent of the amplitude of the Langmuir wave.
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