SAMOP 2021 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 2: Nano-Optics and Optomechanics
Q 2.4: Poster
Montag, 20. September 2021, 16:30–18:30, P
A cavity optomechanical locking scheme based on the optical spring effect — •Felix Klein1, Jakob Butlewski1, Alexander Schwarz2, Roland Wiesendanger1,2, Klaus Sengstock1,3, and Christoph Becker1,3 — 1ZOQ (Zentrum für Optische Quantentechnologien), Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 2INF (Institut für Nanostruktur- und Festkörperphysik), Universität Hamburg, Jungiusstraße 9, 20355 Hamburg, Germany — 3ILP (Institut für Laserphysik), Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany
We present a new method for stabilizing the length of a cavity optomechanical device using the optical spring effect, i.e. the detuning dependent frequency shift of a nanomechanical device caused by optomechanical coupling to the intra-cavity field. The error signal is based on this frequency shift, which is derived from the continuous position measurement of the nanomechanical device. Our locking scheme does not require any additional laser- or cavity modulation and its technical implementation is straightforward. The optical spring lock specifically suits systems with large linewidth such as e.g. microcavities and can be considered as an alternative when other locking schemes appear unfavorable. We demonstrate the implementation of this lock in a fiber-based Fabry-Perot membrane-in-the-middle optomechanical device and characterize its performance in terms of bandwidth and gain profile.