Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster 3
Q 54.60: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.I+II
Setup for dissipative Optomechanics in a signal recycled Michelson-Sagnac Interferometer — •Ramon Moghadas Nia1, Andreas Sawadsky1, Henning Kaufer1, André Xuereb1,2, Klemens Hammerer1,2, and Roman Schnabel1 — 1Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstraße 38, D-30167 Hannover, Germany — 2Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, D-30167 Hannover, Germany
Conventional optomechanical experiments couple mechanical oscillators with an optical cavity mode in a dispersive manner. The result of this is that the cavity resonance frequency experiences a shift depending on the displacement of the mechanical oscillator. Here we illustrate an experimental setup which enables optomechanical coupling, tunable between either a dispersive or a solely dissipative domain. In the dissipative case, the dependence of the cavity linewidth on the mechanical displacement is dominating the dispersive coupling. We use a silicon nitride micro-mechanical membrane with high-Q as a mirror inside a signal-recycled Michelson-Sagnac interferometer. This composition can lead to strongly enhanced cooling in the non-sideband-resolved regime. In the case of a pre-cooled cryogenic setup, one can expect ground state cooling of the membrane*s fundamental oscillation mode. This system is also appropriate for highly sensitive position measurements.