Abstract
The seeding of high-order harmonic (HOH) radiation in a transient Xray laser amplifier was numerically investigated using the code COLAX. The code was recently modified to account (i) for the travelling-wave irradiation of a preformed plasma pumped in the transient regime, and (ii) for the injection of a HOH pulse at the X-ray laser wavelength, and at one boundary of the plasma amplifier. We show that the time-dependent description of the polarisation (TDP) leads to significantly different results in comparison to the widely used adiabatic description. Namely, with TDP, HOH produces a wake in the intensity distribution, which is not only amplified but lasts much longer than the HOH pulse. This could explain recent experimental observations in the spectral domain.
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