1. Institute of Product and Production Engineering, University of Applied Sciences and Arts Northwestern Switzerland,Windisch,Switzerland,5210
2. Paul Scherrer Institute,Laboratory for Non-linear Optics,Villigen,PSI,Switzerland,5232
3. TLD Photonics AG,Wettingen,Switzerland,5430
4. Université de Neuchâtel,Time and Frequency Laboratory,Neuchâtel,Switzerland,2000