Various capabilities of LP3 ASUR platform are presented with particular emphasis on the possibility to combine moderate and high-intensity laser beamlines for developing pump-probe approach with modular (optical/x-ray) time-resolved diagnostics. This unique and highly versatile combination in terms of laser excitation, laser – material arrangement and conditions, and in-operando diagnostics makes the ASUR platform an ideal tool for nurturing fundamental knowledge in laser – material interaction and for innovative laser-driven engineering of materials and devices.
Stimulated emission is a fundamental process in nature that deserves to be investigated and understood in the EUV and X-ray regimes. Today this is definitely possible through high energy density FEL beams. In this context, we show evidence for soft x-ray stimulated emission from a MgO solid target pumped by extreme ultraviolet FEL pulses formed in the regime of travelling-wave amplified spontaneous emission in backward geometry. Our results combine two effects separately reported in previous works: emission in a privileged direction and existence of a material-dependent threshold, for the stimulated emission. We have developed a theoretical framework, based on coupled rate and transport equations taking into account the solid density plasma state of the target. Our model, accounts for both observed mechanisms that are the privileged direction for the stimulated emission of the Mg L2,3 characteristic emission and the pumping threshold.
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