A programmable broadband low frequency active vibration isolation system for atom interferometry

Biao Tang; Lin Zhou; Zongyuan Xiong; Jin Wang; Mingsheng Zhan

doi:10.1063/1.4895911

A programmable broadband low frequency active vibration isolation system for atom interferometry

Rev Sci Instrum. 2014 Sep;85(9):093109. doi: 10.1063/1.4895911.

Authors

Biao Tang¹, Lin Zhou¹, Zongyuan Xiong¹, Jin Wang¹, Mingsheng Zhan¹

Affiliation

¹ State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.

PMID: 25273709
DOI: 10.1063/1.4895911

Abstract

Vibration isolation at low frequency is important for some precision measurement experiments that use atom interferometry. To decrease the vibrational noise caused by the reflecting mirror of Raman beams in atom interferometry, we designed and demonstrated a compact stable active low frequency vibration isolation system. In this system, a digital control subsystem is used to process and feedback the vibration measured by a seismometer. A voice coil actuator is used to control and cancel the motion of a commercial passive vibration isolation platform. With the help of field programmable gate array-based control subsystem, the vibration isolation system performed flexibly and accurately. When the feedback is on, the intrinsic resonance frequency of the system will change from 0.8 Hz to about 0.015 Hz. The vertical vibration (0.01-10 Hz) measured by the in-loop seismometer is reduced by an additional factor of up to 500 on the basis of a passive vibration isolation platform, and we have proved the performance by adding an additional seismometer as well as applying it in the atom interferometry experiment.