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Quantum Electronics and Laser Science Conference

Atom interferometer inertial force sensors

T. L. Gustavson, Arnaud Landragin, J. M. McGuirk, M. J. Snadden, Mark A. Kasevich

Published Jan 20, 2003• 2 citations
Publisher

Abstract

Summary form only given. Atom interferometer inertial force sensors offer the prospect of unprecedented performance for rotation, acceleration and gravity gradient measurements. The basic sensor operating principle is illustrated.
DOI
10.1109/qels.1999.807110

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Recent laboratory experiments have demonstrated atom interference-based inertial force sensors operating at sensitivities near or exceeding the state-of-the-art [2x10-10 rad/sec/Hz1/2 (gyroscope), 10-9 g/Hz1/2 (accelerometer), and 10 E/Hz1/2 (gravity gradient, 1 E = 10-9 sec-2)]. Drawing on this recent experience, we seek to develop gravity gradient sensors which will provide unprecedented capabilities for navigation and geodesy applications. Our technical approach does not rely on cryogenic techniques, and should yield an instrument capable of operating on a broad array of platforms (eg. satellite, space station, plane, etc.). In the long run, we expect these instruments to be economical and robust The demonstration of Bose-Einstein condensation in dilute atomic vapors raises the prospect of a new class of de Broglie wave interferometric sensors. We have recently demonstrated a proof-of-principle accelerometer concept which exploits the novel coherence properties of Bose-Einstein condensed atomic sources.
The atom interferometer was reviewed and its recent development and progress were reported.The interferometer,based on the theory of laser cooling,trapping and manipulation of atom,utilizes the atomic particles as free fall test masses to measure the experienced inertial force of the apparatus.Many tests show that the novel inertial sensors can measure the rotation and acceleration of apparatus with unprecedented sensitivity and precision,and distinguish them by counter-propagating beams of atoms.The atom interferometer can get extensive application in inertial measurement based on them due to its compactness and long-term stability.
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Atomic quantum sensors are a major breakthrough in the technology of time and frequency standards as well as ultra-precise sensing and monitoring of accelerations and rotations. They apply a new kind of optics based on matter waves. Today, atomic clocks are the standard for time and frequency measurement at the highest precisions. Inertial and rotational sensors using atom interferometers have already shown similar potential for replacing state-of-the-art sensors in other fields. With Bose-Einstein condensates, also refered as atom lasers, the traditional experiments with atom interferometers can be greatly improved. Testing of fundamental principles, studies of atomic properties, applications as inertial sensors, and measurements of fundamental constants can benefit from the brightness (intensity and small momentum spread) of these coherent sources. In addition, the coherence properties of condensates may also allow BEC based atom interferometers to approach the Heisenberg detection limit. This corresponds to a measurement precision which scales like 1/N for N atoms and not like 1 / N as for independent measurements on N atoms.
Quantum interferometer gravity gradiometer for 3D mapping is a project for developing the technology of atom interferometer-based gravity sensor in space. The atom interferometer utilizes atomic particles as free fall test masses to measure inertial forces with unprecedented sensitivity and precision. It also allows measurements of the gravity gradient tensor components for 3D mapping of subsurface mass distribution. The overall approach is based on recent advances of laser cooling and manipulation of atoms in atomic and optical physics. Atom interferometers have been demonstrated in research laboratories for gravity and gravity gradient measurements. In this approach, atoms are first laser cooled to micro-kelvin temperatures. Then they are allowed to freefall in vacuum as true drag-free test masses. During the free fall, a sequence of laser pulses is used to split and recombine the atom waves to realize the interferometric measurements. We have demonstrated atom interferometer operation in the Phase I period, and we are implementing the second generation for a complete gradiometer demonstration unit in the laboratory. Along with this development, we are developing technologies at component levels that will be more suited for realization of a space instrument. We will present an update of these developments and discuss the future directions of the quantum gravity gradiometer project.
The past three decades have shown dramatic progress in the ability to manipulate and coherently control the motion of atoms. This exquisite control offers the prospect of a new generation of inertial sensors with unprecedented sensitivity and accuracy, which will be important for both fundamental and applied science. In this article, we review some of our recent results regarding the application of atom interferometry to inertial measurements using compact, mobile sensors. This includes some of the first interferometer measurements with cold 39^{39}39K atoms, which is a major step toward achieving a transportable, dual-species interferometer with rubidium and potassium for equivalence principle tests. We also discuss future applications of this technology, such as remote sensing of geophysical effects, gravitational wave detection, and precise tests of the weak equivalence principle in Space.