Jena 2013 – scientific programme
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GR: Fachverband Gravitation und Relativitätstheorie
GR 4: Gravitationswellen II
GR 4.6: Talk
Tuesday, February 26, 2013, 15:15–15:30, HS 6
Anomalous dynamic back-action in interferometers: beyond the scaling law — •Sergey Tarabrin1,2, Farid Khalili3, Klemens Hammerer1,2, Henning Kaufer1, and Roman Schnabel1 — 1Institut für Gravitationsphysik, Leibniz Universität Hannover and Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstraße 38, 30167 Hannover, Germany — 2Institut für Theoretische Physik, Leibniz Universität Hannover, Appelstraße 2, 30167 Hannover, Germany — 3Department of Physics, Moscow State University, Moscow 119992, Russia
We analyze dynamic back-action in the signal-recycled Michelson-Sagnac interferometer with a translucent membrane positioned in its arm, operated off dark port, and reveal its ’anomalous’ features as compared to the ones of ’canonical’ back-action, obtained within the scope of scaling law. Given the finite reflectivity of the membrane, optical damping as a function of detuning acquires (i) non-zero value on resonance and (ii) several stability/instability regions. In the case of absolutely reflecting membrane, corresponding to a pure Michelson interferometer, off-dark-port regime results in several intersecting regions of positive/negative values of optical spring and damping. For a certain region of parameters, stable sets of both effects in a free-mass interferometer with a single laser drive are possible. Our results can find implementations in both cavity optomechanics, revealing new regimes of cooling of micromechanical oscillators, and in the gravitational-wave detectors, revealing the possibility of stable single-carrier optical spring which can be utilized for the reduction of quantum noise.