1. Institute of Sensors, Signals and Electrotechnics (SENSE), University of Southern Denmark, Niels Bohrs Allé 1E, DK-5230 Odense M, Denmark,
2. Laser Zentrum Hannover e.V., Hollerithallee 8, D-30419 Hannover, Germany
3. Mads Clausen Institute (MCI), University of Southern Denmark, Alsion 2, DK-6400 Sønderborg, Denmark