Congratulations to Janis Wöhler for completing his PhD! Janis’ thesis was titled “Direct measurement of coating thermal noise at the AEI 10m Prototype” which was centred around work on the thermal noise interferometer (TNI).

Janis was able to bring the noise of the TNI to a level of 1 · 10⁻¹⁸ m/√Hz and successfully measured the coating thermal noise of a high reflectivity silica-tantala (Ta2O5/SiO2) sample mirror. This was the first demonstration of a direct thermal noise measurement in the audio-band in Europe.

Janis will soon be taking up a postdoctoral position at the University of Maastricht.