First Measurement of the Non-instantaneous Response Time of a χ(3) Nonlinear Optical Effect Susanta K. Das, M. Bock, R. Grunwald, B. Borchers, J. Hyyti, G. Steinmeyer, D. Ristau, A. Harth, T. Vockerodt, T. Nagy and U. Morgner EPJ Web of Conferences, 41 (2013) 12005 Published online: 13 March 2013 DOI: 10.1051/epjconf/20134112005