CoQuS II Kick-Off Workshop, also honouring Reinhold Bertlmann's 65th Birthday Mitschnitt einer Veranstaltung von Universität Wien, Technischer Universität Wien und Fonds zur Förderung der wissenschaftlichen Forschung am Donnerstag, dem 30. September 2010 im Christian-Doppler-Hörsaal der Fakultät für Physik der Universität Wien Teil 10. Tobias Kippenberg (École Polytechnique Fédérale de Lausanne): Back-action Cooling of Mechanical Oscillators The mutual coupling of optical and mechanical degrees of freedom via radiation pressure has been a subject of interest in the context of quantum limited displacements measurements for Gravity Wave Detection for many decades. Recent advances in nano- and micro-mechanical oscillators have allowed the observation for the first time of radiation pressure phenomena in an experimental setting and constitute the emerging research field of Cavity Optomechanics. Using on-chip micro-cavities that combine both optical and mechanical degrees of freedom in one and the same device, radiation pressure back-action of photons is shown to lead to effective cooling of the mechanical oscillator mode. This back-action cooling exhibits many close analogies to the physics of atomic laser cooling. The case of resolved sideband cooling in the quantum regime will be mentioned, which has enabled preparation of a 75 MHz mechanical oscillator with only 20 quanta. In addition, measurements of both micro- and nanomechanical motion at the standard quantum limit of motion measurement are presented. INHALT ====== Kapitel Titel Position --------------------------------------------------------------------- 1. Vorspann 00:00:00 2. Mechanical effects of light on atoms 00:00:25 3. Dynamical back-action 00:09:17 4. Cavity optomechanics with microcavities 00:16:57 5. Sensitivity of the measurement 00:23:43 6. Cooling by dynamical back-action 00:28:59 7. The challenge of ground state cooling 00:38:22 8. Two level fluctuators 00:45:44

Quantenphysik, Cavity-Opto-Mechanik, Oszillator

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