Simulation of Ne-like Ge 19.6 nm X-ray laser driven by picosecond laser pulse

Transient collisional excitation(TCE) has proved to be an efficient method to significantly save driving energy. In this paper, Ne-like Ge 19.6 nm X-ray laser driven by picosecond Nd:glass laser pulse at 1.053 μm are simulated. The local gain greater than 60 cm-1 is predicted and calculations of the propagation of X-ray laser, including refraction effects, are done to understand which regions have the right combination of high gain and low density gradients for an optimum contribution to the X-ray laser output.