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

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.

[1]  Achim Peters,et al.  Active low frequency vertical vibration isolation , 1999 .

[2]  Jonathan P. How,et al.  Seismic isolation for Advanced LIGO , 2002 .

[3]  M. Loupias,et al.  Measurement of the seismic attenuation performance of the VIRGO Superattenuator , 2005 .

[4]  S. Chu,et al.  Measurement of the gravitational acceleration of an atom with a light-pulse atom interferometer , 1992 .

[5]  Nagi G. Naganathan,et al.  A literature review of automotive vehicle engine mounting systems , 2001 .

[6]  Runbing Li,et al.  Development of an atom gravimeter and status of the 10-meter atom interferometer for precision gravity measurement , 2011 .

[7]  A. Peters,et al.  High-precision gravity measurements using atom interferometry , 1998 .

[8]  Benjamin Canuel,et al.  Measurement of the Sensitivity Function in a Time-Domain Atomic Interferometer , 2008, IEEE Transactions on Instrumentation and Measurement.

[9]  Herman Soemers,et al.  Sensor fusion for active vibration isolation in precision equipment , 2012 .

[10]  R. Adhikari,et al.  Active noise cancellation in a suspended interferometer. , 2011, The Review of scientific instruments.

[11]  P. Nelson,et al.  An active vibration isolation system for inertial reference and precision measurement , 1991 .

[12]  Jun Ye,et al.  Simple and compact 1-Hz laser system via an improved mounting configuration of a reference cavity. , 2005, Optics letters.

[13]  A. Peters,et al.  Measurement of gravitational acceleration by dropping atoms , 1999, Nature.

[14]  Jonathan P. How,et al.  Low-frequency active vibration isolation for advanced LIGO , 2004, SPIE Astronomical Telescopes + Instrumentation.

[15]  Robin T. Stebbins,et al.  An ultra-low-noise, low-frequency, six degrees of freedom active vibration isolator , 1997 .

[16]  A. Miffre,et al.  Vibration-induced phase noise in Mach–Zehnder atom interferometers , 2006, quant-ph/0604022.

[17]  Jia-Yush Yen,et al.  Sliding mode control for active vibration isolation of a long range scanning tunneling microscope , 2004 .

[18]  Kyihwan Park,et al.  Design of mechanical components for vibration reduction in an atomic force microscope. , 2011, The Review of scientific instruments.