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5 October 2011 Bloch-Maxwell modelling of multi-mJ 100 fs fully coherent amplified high harmonic pulse
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Abstract
By seeding amplifying plasmas pumped with the so-called Transient collisionnal excitation scheme, the amplified pulse seems to be limited to an energy of several 10's of μJ. Aiming to attain several mJ, we study the seeding of plasma pumped by long laser pulse. Thanks to our time-dependant Maxwell-Bloch code, we demonstrate that direct seeding with femtosecond pulse is inefficient. We also study the amplification of pulse train with the drawback of re-synchronizing the pulses. We proposed and studied the amplification of high harmonic seed stretched by a grating pair, amplified finally compressed. We consider off-axis diffraction on the gratings for maximizing their efficiency. Considering the phase deformation induced by the amplification and the spectral narrowing the final pulse is 230 fs in duration and 5 mJ.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Ph. Zeitoun, E. Oliva, M. Fajardo, T. T. T. Le, D. Ros, S. Sebban, and P. Velarde "Bloch-Maxwell modelling of multi-mJ 100 fs fully coherent amplified high harmonic pulse", Proc. SPIE 8140, X-ray Lasers and Coherent X-ray Sources: Development and Applications IX, 81400K (5 October 2011); doi: 10.1117/12.893005; https://doi.org/10.1117/12.893005
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