Kolloquiumsvortrag Physik

Jun 05
5. June 2019 12:00 - 13:00
im Hörsaal H, Staudtstr. 5

Prof. Stefanie Kroker
Physikalisch-Technische Bundesanstalt Braunschweig (PTB)
„Quiet please! – Low-noise (nano)-optomechanical systems for listening to the Big Bang“

With the first direct detection of the gravitational waves caused by a binary of black holes in 2015 a new observation window to the universe has been opened. Measuring gravitational wave signals provides us with a richness of information on massive astronomical objects that is not accessible with electromagnetic astronomy. The precision of gravitational wave detectors, however, is crucially limited by fundamental noise processes. Particularly critical is thermal noise, for instance caused by the thermally driven motion of the atoms in the solid. In this lecture we introduce relevant noise mechanisms and discuss their coupling to the readout of the experiments. We illustrate that by a deliberate spatial distribution of optical and mechanical fields the readout of thermal noise can be minimized. To this end, optical micro-and nanostructures are promising to outperform conventional multilayer based optics by several orders of magnitude. This lays the foundation for gravitational wave astronomy and laser spectroscopy with unprecedented precision.

Prof. Klaus Mecke
+49 9131 85 28441