1. Department of Photonics Engineering, Technical University of Denmark, 4000 Roskilde, Denmark
2. ISA, Department of Physics and Astronomy, Aarhus University, 8000 Aarhus, Denmark
3. Swiss Light Source, Paul Scherrer Institut, 5232 Villigen PSI, Switzerland
4. Danish Technological Institute, Kongsvang Alle 29, 8000 Aarhus, Denmark
5. Department of Mechanical Engineering, Technical University of Denmark, 2800 Kgs-Lyngby, Denmark