Two ways of improving the sensitivity of optomechanical systems: adaptive measurements and engineering the mechanical response

31 03/2014

Monday, 31 Mar. 2014, 14:00 - 15:00

Presenter: Mikhail S. Korobko; Dep.of Physics of Oscillation, M.V.Lomonosov Moscow State University
Host: M. Aspelmeyer
Where: Schrödingerroom, Boltzmanngasse 5, 4th floor, room 3425

We discuss two approaches to the improvement of the sensitivity of optomechanical system. The first one is adaptive procedure, where parameters of the measurement scheme depend on information obtained from previous measurements. We consider a model of an impulse force with unknown amplitude and arrival time acting on mechanical oscillator and show how the adaptive approach can improve the precision of measurement of such force.

The second approach supposes using multiple optical springs for modifying the dynamics of free test mass. We show that using several springs is enough to create the response function being constant in a broad frequency band (1-20 Hz), thereby effectively canceling the mechanical inertia of free mass.