@article{6037, author = {X. Yan and A. M. MacLeod and W. A. Gillespie and G.M.H. Knippels and D. Oepts and A. F. G. van der Meer and W. Seidel}, title = {Subpicosecond electro-optic measurement of relativistic electron pulses}, abstract = {Time-resolved measurements of the transverse electric field associated with relativistic electron bunches are presented. Using an ultrafast electro-optic sensor close to the electron beam, the longitudinal profile of the electric field was measured with subpicosecond time resolution and without time-reversal ambiguity. Results are shown for two cases: inside the vacuum beam line in the presence of wake fields, and in air behind a beryllium window, effectively probing the near-field transition radiation. Especially in the latter case, reconstruction of the longitudinal electron bunch shape is straightforward.}, year = {2000}, journal = {Physical Review Letters}, volume = {85}, number = {16}, pages = {3404-3407}, month = {Oct 16}, isbn = {0031-9007}, doi = {10.1103/PhysRevLett.85.3404}, language = {eng}, }