J. Phys. IV France 11 (2001) Pr2-487-Pr2-490
Progress in FWSD non-linear effects with XRLsS.J. Topping1, R. Keenan1, C.L.S. Lewis1, R.M.N. O'Rourke1, A.G. MacPhee1, S. Dobosz1, G.J. Tallents2, M. Notely3 and D. Neely3
1 School of Mathematics and Physics, The Queen's University of Belfast, Belfast BT7 1NN, U. K.
2 Department of Physics, University of York, York YO1 5DD, U.K.
3 Rutherford Appleton Laboratory, Chilton, Didcot, Oxon OX11 0QX, U.K.
Progress of a four-wave sum difference frequency generation scheme to convert coherent soft X-ray radiation to shorter wavelengths, using a plasma medium is discussed. Results are presented from a preliminary experiment, involving the Ne-like Ni XRL ([MATH]) mixed in phase-matched mode with a Nd : glass laser ([MATH]) in a Na-like Argon plasma. A 25 mm single slab target of Ni pumped with [MATH] of energy from 5 optical beams has routinely produced [MATH] of XRL energy at 23.1 mn. The XRL was split and recombined and information from fringe visibility measurements has been used to estimate the degree of spatial coherence in the XRL. Characterisation of the gas jet mixing medium has been carried out through emission spectroscopy and optical interferometry.
© EDP Sciences 2001