Author Affiliations

S.E.D. Webb,^a D.S. Elson,^a J. Siegel,^a S. Lévêque-Fort,^a Y. Gu,^a D. Parsons-Karavassilis,^a M.J. Cole,^a P.M.W. French,^a,* M. J. Lever,^b L. O. Sueharov,^c M. A. A. Neil,^c R. Juškaitis,^c and T. Wilson^c,**

^aFemtosecond Optics Group, Dept. of Physics, Imperial College

^bDept. of Biological and Medical Systems, Imperial College

^cDept. of Engineering Science, Univ. of Oxford

^*phone 44-20-7594 7706; fax 44-20-7594 7714; http://op.ph.ic.ac.uk/femto; Femtosecond Optics Group, Physics Dept., Imperial College, London SW7 2BW, U.K.;

^**phone 44-1865-273116; Department of Engineering Science, University of Oxford, Parks Road, Oxford OX1 3PJ, U.K.