1. Montfort Laser GmbH, Im Holderlob 6a, A-6840 Götzis, Austria
2. Nuremberg Institute of Technology Georg Simon Ohm, Faculty of Applied Mathematics, Physics and Humanities, Keßlerplatz 12, 90489 Nuremberg, Germany
3. University of Stuttgart, 4th Physics Institute and Stuttgart Center of Photonics Engineering, Pfaffenwaldring 57, 70550 Stuttgart, Germany