Dresden 2011 – scientific programme
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ISS: Intersectional Sessions
ISS 1: Micro Mechanical Oscillator 1 (Q, TT)
ISS 1.10: Talk
Monday, March 14, 2011, 12:45–13:00, HSZ 02
Shot noise limited displacement measurement of a high Q micromechanical oscillator below the peak value of the SQL — •Henning Kaufer, Daniel Friedrich, Andreas Sawadsky, Tobias Westphal, Kazuhiro Yamamoto, and Roman Schnabel — Albert-Einstein-Institut, MPI für Gravitationsphysik, QUEST, Leibniz Universität Hannover
The standard quantum limit (SQL) is a classical limit for measurement precision of a test mass position. Using a SiN membrane with a Q-factor of 106 and a mass of 100 ng we achieved a displacement sensitivity of 3· 10−16 m/√Hz in a Michelson-Sagnac interferometer and thereby beat the peak value of the SQL at resonance. The interferometer topology allows implementation of advanced interferometer techniques such as power- or signal recycling. The latter can enhance the displacement sensitivity by a factor of 10 in the first step and reveal thermal noise of the oscillator over a broad frequency range.