Institute of Applied Physics;
Abbe Center of Photonics;
Friedrich-Schiller-Universitat Jena;
Albert-Einstein-Str.15;
07745 Jena;
Germany;
Helmholtz-Institute Jena;
Frobelstieg 3;
07743 Jena;
Germany;
Fraunhofer Institute for Applied Optics and Precision Engineering;
Albert-Einstein-Str.7;
07745 Jena;
Germany;
CREOL;
College of Optics and Photonics;
University of Central Florida;
Orlando;
FL 32816;
USA;
Max-Planck-Institute of Quantum Optics;
Hans-Kopfermann-Str.1;
85748 Garching;
Germany;