Radiation-pressure self-cooling of a micromirror in a cryogenic environment

Author(s): S. Gröblacher, S. Gigan, H. R. Böhm, A. Zeilinger, M. Aspelmeyer

Journal: Europhys. Lett.

Volume: 81

Page(s): 54003

Year: 2008

DOI Number: 10.1209/0295-5075/81/54003

Link: Link to publication


We demonstrate radiation-pressure cavity-cooling of a mechanical mode of a micromirror starting from cryogenic temperatures. To achieve that, a high-finesse Fabry-Pérot cavity (F≈2200) was actively stabilized inside a continuous-flow 4He cryostat. We observed optical cooling of the fundamental mode of a 50 μm×50 μm×5.4 μm singly clamped micromirror at ωm=3.5 MHz from 35 K to approximately 290 mK. This corresponds to a thermal occupation factor of langnrang≈1×104. The cooling performance is only limited by the mechanical quality and by the optical finesse of the system. Heating effects, e.g. due to absorption of photons in the micromirror, could not be observed. These results represent a next step towards cavity-cooling a mechanical oscillator into its quantum ground state.

Note: http://arxiv.org/abs/0705.1149

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Aspelmeyer Group Aspelmeyer Group , Zeilinger Group