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Rostock 2019 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Poster: Quantum Optics and Photonics III

Q 58.24: Poster

Thursday, March 14, 2019, 16:15–18:15, S Atrium Informatik

Optomechanical locking of a large linewidth membrane-in-the-middle cavity using the optical spring effectTobias Wagner1, •Jakob Butlewski1, Philipp Rohse1, Clara Schellong1, Hai Zhong2, Alexander Schwarz2, Roland Wiesendanger2, Klaus Sengstock1, and Christoph Becker11ZOQ-Center for Optical Quantum Technologies, Luruper Chaussee 149, 22761 Hamburg — 2Institute of Applied Physics, University of Hamburg, Jungiusstraße 9-11, 20355 Hamburg

We present a new method for locking the cavity length of a microscopic all-fiber based membrane-in-the-middle optomechanical setup. Our scheme is based on the fact that the so-called optical spring effects leads to a small change of the resonance frequency of the mechanical oscillator as a function of the cavity length. In our locking scheme, we detect this frequency change using a demodulated balanced homodyne signal and feed the corresponding error signal to a PI controller that actuates one of the fiber tips via a piezo tube. We present a detailed characterization of the lock and discuss prospects and limitations. Our locking scheme is beneficial compared to standard locking techniques based on frequency modulation in the case of very short low finesse cavities with correspondingly very large linewidths. This work is supported by the DFG via grants of Wi1277/29-1, BE 4793/2-1, SE 717/9-1 and by the CUI.

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