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.
Philippe Jonnard, Jean-Michel André, Karine Le Guen, Meiyi Wu, Emiliano Principi, Alberto Simoncig, Alessandro Gessini, Riccardo Mincigrucci, Claudio Masciovecchio, and Olivier Peyrusse, "Amplified spontaneous and stimulated Mg L emissions from MgO pumped by FEL pulses," Proc. SPIE 10243, X-ray Lasers and Coherent X-ray Sources: Development and Applications, 102430D (Presented at SPIE Optics + Optoelectronics: April 24, 2017; Published: 17 May 2017); https://doi.org/10.1117/12.2265654.
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