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arXiv · 1009.4231

Determination of the vacuum optomechanical coupling rate using frequency noise calibration

Michael Gorodetsky·Albert Schliesser·Georg Anetsberger·Samuel Deleglise·Tobias J. Kippenberg
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Abstract

The strength of optomechanical interactions in a cavity optomechanical system can be quantified by a vacuum coupling rate $\vcr$ analogous to cavity quantum electrodynamics. This single figure of merit removes the ambiguity in the frequently quoted coupling parameter defining the frequency shift for a given mechanical displacement, and the effective mass of the mechanical mode. Here we demonstrate and verify a straightforward experimental technique to derive the vacuum optomechanical coupling rate. It only requires applying a known frequency modulation of the employed electromagnetic probe field and knowledge of the mechanical oscillator's occupation. The method is experimentally verified for a micromechanical mode in a toroidal whispering-gallery-resonator and a nanomechanical oscillator coupled to a toroidal cavity via its near field.

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Michael Gorodetsky, Albert Schliesser, Georg Anetsberger, Samuel Deleglise, Tobias J. Kippenberg. 2010-09-21. Determination of the vacuum optomechanical coupling rate using frequency noise calibration. https://doi.org/10.1364/oe.18.023236

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