1. Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Str. 1, D-85748 Garching, Germany.
2. Ludwig-Maximilians-Universität München, Am Coulombwall 1, D-85748 Garching, Germany.
3. FFI (Norwegian Defence Research Establishment), P.O. Box 25, NO-2027 Kjeller, Norway.
4. Leibniz-Institute of Photonic Technology, Albert-Einstein-Straße 9, D-07745 Jena, Germany.
5. BAE Systems, P.O. Box 868, Nashua, NH 03063, USA.