The atomic clocks ensemble in space (ACES) is a European Space Agency mission dedicated to fundam... more The atomic clocks ensemble in space (ACES) is a European Space Agency mission dedicated to fundamental metrology based on distant clocks comparisons. The payload will be accommodated on-board the International Space Station (ISS). It is made up two clocks, a two way time transfer link and a GPS-GALILEO receiver. A new type of atomic clock using laser cooled atoms, Pharao,
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007
The PHARAO cold atom clock is developed by the French space agency CNES. The first clock model wh... more The PHARAO cold atom clock is developed by the French space agency CNES. The first clock model which is used to validate the flight model design is been assembled at CNES, Toulouse. We have performed a preliminary test using the laser source, the cesium tube and the microwave source.
Using sympathetic cooling between fermionic and bosonic lithium atoms in a magnetic trap, we have... more Using sympathetic cooling between fermionic and bosonic lithium atoms in a magnetic trap, we have reached quantum degeneracy for both species1. In a first set of experiments we trap both isotopes in their upper hyperfine states where bosonic 7Li atoms have a negative scattering length. We observe a common temperature of T ˜ 1muK, which corresponds to the Bose-Einstein condensation
Page 1. Cold Atom Clocks This article has been downloaded from IOPscience. Please scroll down to ... more Page 1. Cold Atom Clocks This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2001 Phys. Scr. 2001 50 (http://iopscience.iop. org/1402-4896/2001/T95/007) Download details: IP Address ...
We present an investigation of sub-Doppler effects in a cesium magneto-optical trap. First, a sim... more We present an investigation of sub-Doppler effects in a cesium magneto-optical trap. First, a simple one-dimensional theoretical model of the trap is developed for aJg = 1 ?Je = 2 transition. This model predicts the size of the trapped atom cloud and temperature as a function of laser intensity and detuning. In the limit of small magnetic field gradients, the
For several years, the “BNM-Laboratoire Primaire du Temps et des Fréquences” has worked on a cold... more For several years, the “BNM-Laboratoire Primaire du Temps et des Fréquences” has worked on a cold atom frequency standard. With a cesium atomic fountain a resonance line width of 700 mHz has been obtained leading to a short-term stability of 2 × 10−13 τ−12 down to 2 × 10−15 at 104s. A first evaluation of the fountain accuracy has been performed resulting in an accuracy of 3 × 10−15, three times better than previously achieved with thermal beams frequency standards. In the atomic fountain, gravity limits the interaction time to ~1 s, hence the resonance line width to ~0.5 Hz. A factor of 10 reduction in the line width could be obtained in a micro-gravity environment. The “Centre National d'Etudes Spatiales” (the French space agency), the “BNM-Laboratoire Primaire du Temps et des Fréquences”, the “Laboratoire de l'Horloge Atomique” and the “Laboratoire Kastler Brossel” have set up a collaboration to investigate a space frequency standard using cold atoms: the PHARAO project. A microgravity prototype has been constructed and operated first in the reduced gravity of aircraft parabolic flights in May 1997. It is designed as a transportable frequency standard. The PHARAO frequency standard could be a key element in future space missions in fundamental physics such as SORT (solar orbit relativity test), detection of gravitational waves, or for the realization of a global time scale and a new generation of positioning system.
At BNM-SYRTE laboratories in Paris two 133Cs fountains and a 87Rb one have been already demonstra... more At BNM-SYRTE laboratories in Paris two 133Cs fountains and a 87Rb one have been already demonstrated. This paper illustrates the construction of a 87Rb and Cs dual fountain realized within the same structure to work simultaneously. Up to now only the Cs part is under operation but Rb part, already completed, will be soon operational. The experiment has been projected
The atomic clocks ensemble in space (ACES) is a European Space Agency mission dedicated to fundam... more The atomic clocks ensemble in space (ACES) is a European Space Agency mission dedicated to fundamental metrology based on distant clocks comparisons. The payload will be accommodated on-board the International Space Station (ISS). It is made up two clocks, a two way time transfer link and a GPS-GALILEO receiver. A new type of atomic clock using laser cooled atoms, Pharao,
2007 European Conference on Lasers and Electro-Optics and the International Quantum Electronics Conference, 2007
The PHARAO cold atom clock is developed by the French space agency CNES. The first clock model wh... more The PHARAO cold atom clock is developed by the French space agency CNES. The first clock model which is used to validate the flight model design is been assembled at CNES, Toulouse. We have performed a preliminary test using the laser source, the cesium tube and the microwave source.
Using sympathetic cooling between fermionic and bosonic lithium atoms in a magnetic trap, we have... more Using sympathetic cooling between fermionic and bosonic lithium atoms in a magnetic trap, we have reached quantum degeneracy for both species1. In a first set of experiments we trap both isotopes in their upper hyperfine states where bosonic 7Li atoms have a negative scattering length. We observe a common temperature of T ˜ 1muK, which corresponds to the Bose-Einstein condensation
Page 1. Cold Atom Clocks This article has been downloaded from IOPscience. Please scroll down to ... more Page 1. Cold Atom Clocks This article has been downloaded from IOPscience. Please scroll down to see the full text article. 2001 Phys. Scr. 2001 50 (http://iopscience.iop. org/1402-4896/2001/T95/007) Download details: IP Address ...
We present an investigation of sub-Doppler effects in a cesium magneto-optical trap. First, a sim... more We present an investigation of sub-Doppler effects in a cesium magneto-optical trap. First, a simple one-dimensional theoretical model of the trap is developed for aJg = 1 ?Je = 2 transition. This model predicts the size of the trapped atom cloud and temperature as a function of laser intensity and detuning. In the limit of small magnetic field gradients, the
For several years, the “BNM-Laboratoire Primaire du Temps et des Fréquences” has worked on a cold... more For several years, the “BNM-Laboratoire Primaire du Temps et des Fréquences” has worked on a cold atom frequency standard. With a cesium atomic fountain a resonance line width of 700 mHz has been obtained leading to a short-term stability of 2 × 10−13 τ−12 down to 2 × 10−15 at 104s. A first evaluation of the fountain accuracy has been performed resulting in an accuracy of 3 × 10−15, three times better than previously achieved with thermal beams frequency standards. In the atomic fountain, gravity limits the interaction time to ~1 s, hence the resonance line width to ~0.5 Hz. A factor of 10 reduction in the line width could be obtained in a micro-gravity environment. The “Centre National d'Etudes Spatiales” (the French space agency), the “BNM-Laboratoire Primaire du Temps et des Fréquences”, the “Laboratoire de l'Horloge Atomique” and the “Laboratoire Kastler Brossel” have set up a collaboration to investigate a space frequency standard using cold atoms: the PHARAO project. A microgravity prototype has been constructed and operated first in the reduced gravity of aircraft parabolic flights in May 1997. It is designed as a transportable frequency standard. The PHARAO frequency standard could be a key element in future space missions in fundamental physics such as SORT (solar orbit relativity test), detection of gravitational waves, or for the realization of a global time scale and a new generation of positioning system.
At BNM-SYRTE laboratories in Paris two 133Cs fountains and a 87Rb one have been already demonstra... more At BNM-SYRTE laboratories in Paris two 133Cs fountains and a 87Rb one have been already demonstrated. This paper illustrates the construction of a 87Rb and Cs dual fountain realized within the same structure to work simultaneously. Up to now only the Cs part is under operation but Rb part, already completed, will be soon operational. The experiment has been projected
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