Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster 3: Quantengase, Ultrakalte Atome, Ultrakalte Moleküle, Materiewellen Optik, Präzisionsmessungen, Metrologie
Q 57.83: Poster
Donnerstag, 17. März 2011, 16:30–19:30, P1
Length sensing and control of the AEI 10 m Prototype sub-SQL interferometer — •Christian Gräf for the AEI 10m Prototype Team — Max-Planck-Institut für Gravitationphysik (Albert-Einstein- Institut), Institut für Gravitationsphysik, Leibniz Universität Hannover und QUEST
The AEI 10 m Prototype sub-SQL interferometer, which is currently being set up at the AEI in Hannover, Germany, aims at beating the Standard Quantum Limit (SQL) at Fourier frequencies of ∼ 100 Hz, reaching for a displacement sensitivity of ∼ 10−19 m/√Hz. Reducing the impact of fluctuations on the lengths
in the optical setup is crucial for the instrument to unfold its full potential for
ultra-high sensitivity measurements of the differential mode of its interferometer arms.
Electronic feedback control has proven an essential tool to fulfill this requirement by actively
feeding back length error signals, obtained by phase modulation/demodulation techniques, to the suspended optics
of the interferometer. A high-performance real time digital control system is employed to hold the multitude of length degrees-of-freedom tightly at predefined operating points.
Due to the high complexity of the underlying optical system, simulations play a key
role in the design of the signal extraction and control scheme.
In this talk an overview of selected aspects of the longitudinal sensing and control system design for the AEI 10 m Prototype sub-SQL interferometer is given.