The Experts below are selected from a list of 17094 Experts worldwide ranked by ideXlab platform
Arnaud Landragin - One of the best experts on this subject based on the ideXlab platform.
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Accurate trajectory alignment in Cold-Atom interferometers with separated laser beams
Phys.Rev.A, 2020Co-Authors: M Altorio, D Savoie, Arnaud Landragin, L A Sidorenkov, R. Gautier, R GeigerAbstract:Cold-Atom interferometers commonly face systematic effects originating from the coupling between the trajectory of the Atomic wave packet and the wavefront of the laser beams driving the interferometer. Detrimental for the accuracy and the stability of such inertial sensors, these systematics are particularly enhanced in architectures based on spatially separated laser beams. Here we analyze the effect of a coupling between the relative alignment of two separated laser beams and the trajectory of the Atomic wave packet in a four-light-pulse Cold-Atom gyroscope operated in fountain configuration. We present a method to align the two laser beams at the 0.2μrad level and to determine the optimal mean velocity of the Atomic wave packet with an accuracy of 0.2mms−1. Such fine tuning constrains the associated gyroscope bias to a level of 1×10−10rads−1. In addition, we reveal this coupling using the point-source interferometry technique by analyzing single-shot time-of-flight fluorescence traces, which allows us to measure large angular misalignments between the interrogation beams. The alignment method which we present here can be employed in other sensor configurations and is particularly relevant to emerging gravitational wave detector concepts based on Cold-Atom interferometry.
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High-accuracy inertial measurements with Cold-Atom sensors
AVS Quantum Science, 2020Co-Authors: Remi Geiger, Arnaud Landragin, Sébastien Merlet, Franck Pereira Dos SantosAbstract:The research on Cold-Atom interferometers gathers a large community of about 50 groups worldwide both in the academic and now in the industrial sectors. The interest in this sub-field of quantum sensing and metrology lies in the large panel of possible applications of Cold-Atom sensors for measuring inertial and gravitational signals with a high level of stability and accuracy. This review presents the evolution of the field over the last 30 years and focuses on the acceleration of the research effort in the last 10 years. The article describes the physics principle of Cold-Atom gravito-inertial sensors as well as the main parts of hardware and the expertise required when starting the design of such sensors. It then reviews the progress in the development of instruments measuring gravitational and inertial signals, with a highlight on the limitations to the performances of the sensors, on their applications, and on the latest directions of research.
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Characterization and limits of a Cold Atom Sagnac interferometer
2017Co-Authors: Alexandre Gauguet, Benjamin Canuel, Walid Chaibi, Thomas Leveque, Arnaud LandraginAbstract:We present the full evaluation of a Cold Atom gyroscope based on Atom interferometry. We have performed extensive studies to determine the systematic errors, scale factor and sensitivity. We demonstrate that the acceleration noise can be efficiently removed from the rotation signal allowing to reach the fundamental limit of the quantum projection noise for short term measurements. The technical limits to the long term sensitivity and accuracy have been identified, clearing the way for the next generations of ultra-sensitive Atom gyroscopes.
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6-axis inertial sensor using Cold-Atom interferometry
Physical Review Letters, 2017Co-Authors: Benjamin Canuel, J. Fils, FLORENCE LEDUC, David Holleville, NoËl Dimarcq, Andre Clairon, Alexandre Gauguet, Christian J. Bordé, Antonio Virdis, Philippe Bouyer, Arnaud LandraginAbstract:We have developed an Atom interferometer providing a full inertial base. This device uses two counter-propagating Cold-Atom clouds that are launched in strongly curved parabolic trajectories. Three single Raman beam pairs, pulsed in time, are successively applied in three orthogonal directions leading to the measurement of the three axis of rotation and acceleration. In this purpose, we introduce a new Atom gyroscope using a butterfly geometry. We discuss the present sensitivity and the possible improvements.
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Continuous Cold-Atom Inertial Sensor with 1 nrad/sec Rotation Stability
Physical Review Letters, 2017Co-Authors: Indranil Dutta, B. Venon, C. L. Garrido Alzar, D Savoie, Randall Geiger, B Fang, Arnaud LandraginAbstract:We report the operation of a Cold-Atom inertial sensor which continuously captures the rotation signal. Using a joint interrogation scheme, where we simultaneously prepare a Cold-Atom source and operate an Atom interferometer (AI), enables us to eliminate the dead times. We show that such continuous operation improves the short-term sensitivity of AIs, and demonstrate a rotation sensitivity of 100 nrad/sec/Hz−−−√ in a Cold-Atom gyroscope of 11 cm2 Sagnac area. We also demonstrate a rotation stability of 1 nrad/sec at 104 sec of integration time, which represents the state of the art for Atomic gyroscopes. The continuous operation of Cold-Atom inertial sensors will lead to large area AIs at their full sensitivity potential, determined by the quantum noise limit.
Liang Liu - One of the best experts on this subject based on the ideXlab platform.
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Development of a space Cold Atom clock
National Science Review, 2020Co-Authors: Wei Ren, Bin Wang, Weibiao Chen, Liang LiuAbstract:Abstract Atomic clocks with Cold Atoms play important roles in the field of fundamental physics as well as primary frequency standards. Operating such Cold Atom clocks in space paves the way for further exploration in fundamental physics, for example dark matter and general relativity. We developed a space Cold Atom clock (SCAC), which was launched into orbit with the Space Lab TG-2 in 2016. Before it deorbited with TG-2 in 2019, the SCAC had been working continuously for almost 3 years. During the period in orbit, many scientific experiments and engineering tests were performed. In this article, we summarize the principle, development and in-orbit results. These works provide the basis for construction of a space-borne time-frequency system in deep space.
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Tests of Cold Atom Clock in Orbit
arXiv: Atomic Physics, 2017Co-Authors: Liang Liu, Bin Wang, Wei Ren, Chen Weibiao, Z. Dong, Jianbo ZhaoAbstract:Since the Atomic clock was invented, its performance has been improved for one digit every decade until 90s of last century when the traditional Atomic clock almost reached its limit. With laser cooled Atoms, the performance can be further improved, and nowadays the Cold Atom based clocks are widely used as primary frequency standards. Such a kind of Cold Atom clocks has great applications in space. This paper presents the design and tests of a Cold Atom clock (CAC) operating in space. In microgravity, the Atoms are cooled, trapped, launched and finally detected after being interrogated by microwave field with Ramsey method. The results of laser cooling of Atoms in microgravity in orbit are presented and compared with that on ground for the first time. That the full width at half maximum (FWHM) of obtained central Ramsey fringes varies linearly with launching velocity of Cold Atoms shows the effects of microgravity. With appropriate parameters, a closed-loop locking of the CAC is realized in orbit and the estimated short term frequency stability of $3.0\times 10 ^{-13}/\sqrt{\tau }$ has been reached.
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State Preparation in a Cold Atom Clock by Optical Pumping
Chinese Physics Letters, 2017Co-Authors: Yu-xiong Duan, Bin Wang, Jingfeng Xiang, Liu Qian, Liang LiuAbstract:We implement optical pumping to prepare Cold Atoms in our prototype of the Rb-87 space Cold Atom clock, which operates in the one-way mode. Several modifications are made on our previous physical and optical system. The effective Atomic signal in the top detection zone is increased to 2.5 times with 87% pumping efficiency. The temperature of the Cold Atom cloud is increased by 1.4 mu K. We study the dependences of the effective signal gain and pumping efficiency on the pumping laser intensity and detuning. The effects of sigma transition are discussed. This technique may be used in the future space Cold Atom clocks.
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initial tests of a rubidium space Cold Atom clock
Chinese Physics Letters, 2016Co-Authors: Bin Wang, Jianbo Zhao, Wei Ren, Xin Zhao, Yuanyuan Yao, Liang LiuAbstract:We report the initial test results of a rubidium (87Rb) space Cold Atom clock (SCAC). The space-qualified 87Rb SCAC is composed of the physical package, the optical bench, the microwave synthesizer and the control electronics. After the system is integrated, about 108 87Rb Cold Atoms are captured by magneto-optical trap. The linewidth of the Ramsey fringe is about 10 Hz for the free evolution time of 50 ms on the ground, and the signal-to-noise ratio is measured to be larger than 300. We demonstrate a good medium-term fractional frequency stability of 1.5 × 10−14@1000 s in the closed-loop operation on the ground. The main effects of the noise on the stability are also presented, and the optimized operating parameter is analyzed for the operation of SCAC in the microgravity environment.
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automatic compensation of magnetic field for a rubidium space Cold Atom clock
Chinese Physics B, 2016Co-Authors: Wei Ren, Xin Zhao, Jingfeng Xiang, Xiangkai Peng, Liang LiuAbstract:When the Cold Atom clock operates in microgravity around the near-earth orbit, its performance will be affected by the fluctuation of magnetic field. A strategy is proposed to suppress the fluctuation of magnetic field by additional coils, whose current is changed accordingly to compensate the magnetic fluctuation by the linear and incremental compensation. The flight model of the Cold Atom clock is tested in a simulated orbital magnetic environment and the magnetic field fluctuation in the Ramsey cavity is reduced from 17 nT to 2 nT, which implied the uncertainty due to the second order Zeeman shift is reduced to be less than 2×10−16. In addition, utilizing the compensation, the magnetic field in the trapping zone can be suppressed from 7.5 μT to less than 0.3 μT to meet the magnetic field requirement of polarization gradients cooling of Atoms.
Ferruccio Renzoni - One of the best experts on this subject based on the ideXlab platform.
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A Cold Atom radio-frequency magnetometer
Applied Physics Letters, 2019Co-Authors: Yuval Cohen, Krishna Jadeja, Sindi Sula, Michela Venturelli, Cameron Deans, Luca Marmugi, Ferruccio RenzoniAbstract:We propose and demonstrate a radio-frequency Atomic magnetometer with sub-Doppler laser cooled rubidium-87. With a simple and compact design, our system demonstrates a sensitivity of 330 pT / Hz in an unshielded environment, thus matching or surpassing previously reported Cold Atom designs. By merging the multiple uses and the robustness of radio-frequency Atomic magnetometers with the detailed control of laser cooling, our Cold Atom radio-frequency magnetometer has potential for moving applications of Atomic magnetometry to high spatial resolutions. A direct impact in metrology for applied sciences, materials characterization, and nanotechnology can be anticipated.We propose and demonstrate a radio-frequency Atomic magnetometer with sub-Doppler laser cooled rubidium-87. With a simple and compact design, our system demonstrates a sensitivity of 330 pT / Hz in an unshielded environment, thus matching or surpassing previously reported Cold Atom designs. By merging the multiple uses and the robustness of radio-frequency Atomic magnetometers with the detailed control of laser cooling, our Cold Atom radio-frequency magnetometer has potential for moving applications of Atomic magnetometry to high spatial resolutions. A direct impact in metrology for applied sciences, materials characterization, and nanotechnology can be anticipated.
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A Cold Atom Radio-Frequency Magnetometer
Applied Physics Letters, 2019Co-Authors: Yuval Cohen, Krishna Jadeja, Sindi Sula, Michela Venturelli, Cameron Deans, Luca Marmugi, Ferruccio RenzoniAbstract:We propose and demonstrate a radio-frequency Atomic magnetometer with sub-Doppler laser cooled rubidium-87. With a simple and compact design, our system demonstrates a sensitivity of $330~pT/\sqrt{Hz}$ in an unshielded environment, thus matching or surpassing previously reported Cold Atoms designs. By merging the multiple uses and robustness of radio-frequency Atomic magnetometers with the detailed control of laser cooling, our Cold Atom radio-frequency magnetometer has the potential to move applications of Atomic magnetometry to high spatial resolution. Direct impact in metrology for applied sciences, materials characterization, and nanotechnology can be anticipated.
Wei Ren - One of the best experts on this subject based on the ideXlab platform.
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Development of a space Cold Atom clock
National Science Review, 2020Co-Authors: Wei Ren, Bin Wang, Weibiao Chen, Liang LiuAbstract:Abstract Atomic clocks with Cold Atoms play important roles in the field of fundamental physics as well as primary frequency standards. Operating such Cold Atom clocks in space paves the way for further exploration in fundamental physics, for example dark matter and general relativity. We developed a space Cold Atom clock (SCAC), which was launched into orbit with the Space Lab TG-2 in 2016. Before it deorbited with TG-2 in 2019, the SCAC had been working continuously for almost 3 years. During the period in orbit, many scientific experiments and engineering tests were performed. In this article, we summarize the principle, development and in-orbit results. These works provide the basis for construction of a space-borne time-frequency system in deep space.
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Tests of Cold Atom Clock in Orbit
arXiv: Atomic Physics, 2017Co-Authors: Liang Liu, Bin Wang, Wei Ren, Chen Weibiao, Z. Dong, Jianbo ZhaoAbstract:Since the Atomic clock was invented, its performance has been improved for one digit every decade until 90s of last century when the traditional Atomic clock almost reached its limit. With laser cooled Atoms, the performance can be further improved, and nowadays the Cold Atom based clocks are widely used as primary frequency standards. Such a kind of Cold Atom clocks has great applications in space. This paper presents the design and tests of a Cold Atom clock (CAC) operating in space. In microgravity, the Atoms are cooled, trapped, launched and finally detected after being interrogated by microwave field with Ramsey method. The results of laser cooling of Atoms in microgravity in orbit are presented and compared with that on ground for the first time. That the full width at half maximum (FWHM) of obtained central Ramsey fringes varies linearly with launching velocity of Cold Atoms shows the effects of microgravity. With appropriate parameters, a closed-loop locking of the CAC is realized in orbit and the estimated short term frequency stability of $3.0\times 10 ^{-13}/\sqrt{\tau }$ has been reached.
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initial tests of a rubidium space Cold Atom clock
Chinese Physics Letters, 2016Co-Authors: Bin Wang, Jianbo Zhao, Wei Ren, Xin Zhao, Yuanyuan Yao, Liang LiuAbstract:We report the initial test results of a rubidium (87Rb) space Cold Atom clock (SCAC). The space-qualified 87Rb SCAC is composed of the physical package, the optical bench, the microwave synthesizer and the control electronics. After the system is integrated, about 108 87Rb Cold Atoms are captured by magneto-optical trap. The linewidth of the Ramsey fringe is about 10 Hz for the free evolution time of 50 ms on the ground, and the signal-to-noise ratio is measured to be larger than 300. We demonstrate a good medium-term fractional frequency stability of 1.5 × 10−14@1000 s in the closed-loop operation on the ground. The main effects of the noise on the stability are also presented, and the optimized operating parameter is analyzed for the operation of SCAC in the microgravity environment.
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automatic compensation of magnetic field for a rubidium space Cold Atom clock
Chinese Physics B, 2016Co-Authors: Wei Ren, Xin Zhao, Jingfeng Xiang, Xiangkai Peng, Liang LiuAbstract:When the Cold Atom clock operates in microgravity around the near-earth orbit, its performance will be affected by the fluctuation of magnetic field. A strategy is proposed to suppress the fluctuation of magnetic field by additional coils, whose current is changed accordingly to compensate the magnetic fluctuation by the linear and incremental compensation. The flight model of the Cold Atom clock is tested in a simulated orbital magnetic environment and the magnetic field fluctuation in the Ramsey cavity is reduced from 17 nT to 2 nT, which implied the uncertainty due to the second order Zeeman shift is reduced to be less than 2×10−16. In addition, utilizing the compensation, the magnetic field in the trapping zone can be suppressed from 7.5 μT to less than 0.3 μT to meet the magnetic field requirement of polarization gradients cooling of Atoms.
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highly reliable optical system for a rubidium space Cold Atom clock
Applied Optics, 2016Co-Authors: Wei Ren, Bin Wang, Z. Dong, Jingfeng Xiang, Yanguang Sun, Wenbing Xia, Liang LiuAbstract:We describe a highly reliable optical system designed for a rubidium space Cold Atom clock (SCAC), presenting its design, key technologies, and optical components. All of the optical and electronic components are integrated onto an optimized two-sided 300 mm×290 mm×30 mm optical bench. The compact optical structure and special thermal design ensure that the optical system can pass all of the space environmental qualification tests including both thermal vacuum and mechanical tests. To verify its performance, the optical system is carefully checked before and after each test. The results indicate that this optical system is suitably robust for the space applications for which the rubidium SCAC was built.
Philippe Bouyer - One of the best experts on this subject based on the ideXlab platform.
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6-axis inertial sensor using Cold-Atom interferometry
Physical Review Letters, 2017Co-Authors: Benjamin Canuel, J. Fils, FLORENCE LEDUC, David Holleville, NoËl Dimarcq, Andre Clairon, Alexandre Gauguet, Christian J. Bordé, Antonio Virdis, Philippe Bouyer, Arnaud LandraginAbstract:We have developed an Atom interferometer providing a full inertial base. This device uses two counter-propagating Cold-Atom clouds that are launched in strongly curved parabolic trajectories. Three single Raman beam pairs, pulsed in time, are successively applied in three orthogonal directions leading to the measurement of the three axis of rotation and acceleration. In this purpose, we introduce a new Atom gyroscope using a butterfly geometry. We discuss the present sensitivity and the possible improvements.
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development of compact Cold Atom sensors for inertial navigation
arXiv: Atomic Physics, 2016Co-Authors: Baptiste Battelier, Arnaud Landragin, B Barrett, L Fouche, L Chichet, L Antonimicollier, Henri Porte, Fabien Napolitano, J Lautier, Philippe BouyerAbstract:Inertial sensors based on Cold Atom interferometry exhibit many interesting features for applications related to inertial navigation, particularly in terms of sensitivity and long-term stability. However, at present the typical Atom interferometer is still very much an experiment---consisting of a bulky, static apparatus with a limited dynamic range and high sensitivity to environmental effects. To be compliant with mobile applications further development is needed. In this work, we present a compact and mobile experiment, which we recently used to achieve the first inertial measurements with an Atomic accelerometer onboard an aircraft. By integrating classical inertial sensors into our apparatus, we are able to operate the Atomic sensor well beyond its standard operating range, corresponding to half of an interference fringe. We report Atom-based acceleration measurements along both the horizontal and vertical axes of the aircraft with one-shot sensitivities of $2.3 \times 10^{-4}\,g$ over a range of $\sim 0.1\,g$. The same technology can be used to develop Cold-Atom gyroscopes, which could surpass the best optical gyroscopes in terms of long-term sensitivity. Our apparatus was also designed to study multi-axis Atom interferometry with the goal of realizing a full inertial measurement unit comprised of the three axes of acceleration and rotation. Finally, we present a compact and tunable laser system, which constitutes an essential part of any Cold-Atom-based sensor. The architecture of the laser is based on phase modulating a single fiber-optic laser diode, and can be tuned over a range of 1 GHz in less than 200 $\mu$s.
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development of compact Cold Atom sensors for inertial navigation
Proceedings of SPIE, 2016Co-Authors: Baptiste Battelier, Arnaud Landragin, B Barrett, L Fouche, L Chichet, L Antonimicollier, Henri Porte, Fabien Napolitano, J Lautier, Philippe BouyerAbstract:Inertial sensors based on Cold Atom interferometry exhibit many interesting features for applications related to inertial navigation, particularly in terms of sensitivity and long-term stability. However, at present the typical Atom interferometer is still very much an experiment—consisting of a bulky, static apparatus with a limited dynamic range and high sensitivity to environmental effects. To be compliant with mobile applications further development is needed. In this work, we present a compact and mobile experiment, which we recently used to achieve the first inertial measurements with an Atomic accelerometer onboard an aircraft. By integrating classical inertial sensors into our apparatus, we are able to operate the Atomic sensor well beyond its standard operating range, corresponding to half of an interference fringe. We report Atom-based acceleration measurements along both the horizontal and vertical axes of the aircraft with one-shot sensitivities of 2.3 × 10 −4 g over a range of ∼ 0.1 g . The same technology can be used to develop Cold-Atom gyroscopes, which could surpass the best optical gyroscopes in terms of long-term sensitivity. Our apparatus was also designed to study multi-axis Atom interferometry with the goal of realizing a full inertial measurement unit comprised of the three axes of acceleration and rotation. Finally, we present a compact and tunable laser system, which constitutes an essential part of any Cold-Atom-based sensor. The architecture of the laser is based on phase modulating a single fiber-optic laser diode, and can be tuned over a range of 1 GHz in less than 200 μs.
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Underground operation at best sensitivity of the mobile LNE-SYRTE Cold Atom gravimeter
Gyroscopy and Navigation, 2014Co-Authors: Tristan Farah, Philippe Bouyer, A Landragin, C. Guerlin, Stéphane Gaffet, Franck Pereira Dos Santos, S MerletAbstract:Low noise underground environments offer conditions allowing assessment of ultimate performance of high sensitivity sensors such as accelerometers, gyrometers, seismometers⋯ Such facilities are for instance ideal for observing the tiny signals of interest for geophysical studies. Laboratoire Souterrain à Bas Bruit (LSBB) in which we have installed our Cold Atom gravimeter provides such an environment. We report here the best short term sensitivity ever obtained without any ground vibration isolation system with such an instrument: 10−8 m s−2 in 100 s measurement time.
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Underground operation at best sensitivity of the mobile LNE-SYRTE Cold Atom Gravimeter
2014Co-Authors: Tristan Farah, Arnaud Landragin, Philippe Bouyer, Christine Guerlin, Stéphane Gaffet, Franck Pereira Dos Santos, Sébastien MerletAbstract:Low noise underground environments offer conditions allowing to assess ultimate performance of high sensitivity sensors such as accelerometers, gyrometers, seismometers... Such facilities are for instance ideal for observing the tiny signals of interest for geophysical studies. Laboratoire Souterrain à Bas Bruit (LSBB) in which we have installed our Cold Atom gravimeter, provides such an environment. We report here the best short term sensitivity ever obtained without any ground vibration isolation system with such an instrument: $10^{-8}$m.s$^{-2}$ in 100 s measurement time.