1. Gérard Mourou Center for Ultrafast Optical Science, University of Michigan, Ann Arbor, Michigan 48109, USA
2. Helmholtz Institut Jena, Fröbelstieg 3, 07743 Jena, Germany
3. GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, 64291 Darmstadt, Germany
4. Department of Electrical and Computer Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
5. Department of Physics and Astronomy, University of California, Irvine, California 92697, USA
6. Sandia National Laboratories, Albuquerque, New Mexico 87185, USA