Active low frequency vertical vibration isolation

Hensley, Joel M.; Peters, A.; Chu, Steven

doi:10.1063/1.1149838

Cited by 107 publications

(82 citation statements)

References 9 publications

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“…Any vibrations of the laboratory translate into phase shifts of the laser beams in this frame, and if the distribution of φ L has a width that is comparable to π/n, they render the interferences invisible. With non-LMT beam splitters, vibrations can be suppressed to acceptable levels by state of the art vibration isolation [22]. This becomes difficult, however, with n ≫ 1 LMT beam splitters.…”

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confidence: 99%

Noise-Immune Conjugate Large-Area Atom Interferometers

et al. 2009

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We present a pair of simultaneous conjugate Ramsey-Bordé atom interferometers (SCI) using large (20hk)-momentum transfer (LMT) beam splitters, wherehk is the photon momentum. Simultaneous operation allows for common-mode rejection of vibrational noise. This allows us to surpass the enclosed space-time area of previous interferometers with a splitting of 20hk by a factor of 2,500.Among applications, we demonstrate a 3.4 ppb resolution in the fine structure constant and discuss tests of fundamental laws of physics.

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confidence: 99%

Noise-Immune Conjugate Large-Area Atom Interferometers

et al. 2009

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“…In the usual geometry where the laser beams are retroreflected on a mirror, the position of this mirror sets the position of the lasers equiphase, so that only this "reference" optical element is to be shielded from ground vibrations. Such an isolation can be realized either with an active stabilization scheme, using a long period superspring [2,10,11], or by using a passive isolation platform [12]. For instance, the use of a superspring allowed increasing the interaction time up to 800 ms and reaching a best short term sensitivity to acceleration of 8 × 10 −8 m.s −2 at 1 s [13].…”

Section: Introductionmentioning

confidence: 99%

Operating an atom interferometer beyond its linear range

Merlet¹,

Gouët²,

Bodart³

et al. 2009

Metrologia

117

120

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In this paper, we show that an atom interferometer inertial sensor, when associated to the auxiliary measurement of external vibrations, can be operated beyond its linear range and still keep a high acceleration sensitivity. We propose and compare two measurement procedures (fringe fitting and nonlinear lock) that can be used to extract the mean phase of the interferometer when the interferometer phase fluctuations exceed 2π. Despite operating in the urban environment of inner Paris without any vibration isolation, the use of a low noise seismometer for the measurement of ground vibrations allows our atom gravimeter to reach at night a sensitivity as good as 5.5×10 −8 g at 1 s. Robustness of the measurement to large vibration noise is also demonstrated by the ability of our gravimeter to operate during an earthquake with excellent sensitivity. Our high repetition rate allows for recovering the true low frequency seismic vibrations, ensuring proper averaging.Such techniques open new perspectives for applications in other fields, such as navigation and geophysics. * Electronic address: franck.pereira@obspm.fr

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“…(1) To reduce seismic noise, one can place the mirrors on active platforms controlled by appropriate feedback systems [69,70]. These are quite good at reducing the lower frequency seismic noises.…”

Section: Noisesmentioning

confidence: 99%

Gravitational wave astronomy: the current status

Blair

Zhao

et al. 2015

Sci. China Phys. Mech. Astron.

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In the centenary year of Einstein's General Theory of Relativity, this paper reviews the current status of gravitational wave astronomy across a spectrum which stretches from attohertz to kilohertz frequencies. Sect. 1 of this paper reviews the historical development of gravitational wave astronomy from Einstein's first prediction to our current understanding the spectrum. It is shown that detection of signals in the audio frequency spectrum can be expected very soon, and that a north-south pair of next generation detectors would provide large scientific benefits. Sect. 2 reviews the theory of gravitational waves and the principles of detection using laser interferometry. The state of the art Advanced LIGO detectors are then described. These detectors have a high chance of detecting the first events in the near future. Sect. 3 reviews the KAGRA detector currently under development in Japan, which will be the first laser interferometer detector to use cryogenic test masses. Sect. 4 of this paper reviews gravitational wave detection in the nanohertz frequency band using the technique of pulsar timing. Sect. 5 reviews the status of gravitational wave detection in the attohertz frequency band, detectable in the polarisation of the cosmic microwave background, and discusses the prospects for detection of primordial waves from the big bang. The techniques described in sects. 1-5 have already placed significant limits on the strength of gravitational wave sources. Sects. 6 and 7 review ambitious plans for future space based gravitational wave detectors in the millihertz frequency band. Sect. 6 presents a roadmap for development of space based gravitational wave detectors by China while sect. 7 discusses a key enabling technology for space interferometry known as time delay interferometry. gravitational waves, ground based detectors, pulsar timing, spaced based detectors, CMB PACS number(s): 04.80. Nn, 07.20.Mc,

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Active low frequency vertical vibration isolation

Cited by 107 publications

References 9 publications

Noise-Immune Conjugate Large-Area Atom Interferometers

Noise-Immune Conjugate Large-Area Atom Interferometers

Operating an atom interferometer beyond its linear range

Gravitational wave astronomy: the current status

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