J. Phys. IV France 11 (2001) Pr2-59-Pr2-66
Short pulse pumped X-ray lasersG.J. Tallents1, F. Strati1, J.Y. Lin2, R. Smith3, S.J. Pestehe1, G.J. Pert1, C.L.S. Lewis4, A.G. MacPhee1 and R. Keenan1
1 Department of Physics, University of York, York YO10 5DD, U.K.
2 Department of Physics, National Chung Cheng University, Ghia-Yi 621, Taiwan, R.O.C.
3 LSAI, Université Paris-Sud, bâtiment 350, 91405 Orsay, France
4 School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, U.K.
Double laser pulses of duration [MATH] and short laser pulses [MATH] superimposed on longer duration background pulses have been shown to efficiently pump lasing in Ne-like and Ni-like ions. For the 75 ps pumping, X-ray laser output without travelling wave pumping is shown to be well-described by a model of ASE output. With 1 ps pumping, the X-ray laser output with different velocity travelling wave pumping is well-fitted with an extension to the ASE model allowing for travelling wave excitation of the gain along the plasma line. The model is used to investigate the production of short ([MATH]) x-ray laser pulses and the effects of non-ideal travelling wave velocities on the X-ray laser output. Resonance line spectra of emission perpendicular to the plasma line are measured and simulated. It is shown that an accurate opacity model for the more intense Ne-like ions is needed to correctly simulate the spectra.
© EDP Sciences 2001