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Comment on "Observation of Ramsey Fringes Using a Stimulated, Resonance Raman Transition in a Sodium Atomic Beam"

A. G. Mungall

Physical Review LettersFeb 14, 19834 citations

Observation of ultranarrow Ramsey fringes in two-photon transitions to Rydberg levels in a rubidium atomic beam (A)

J. Helmcke, S. A. Lee, J. L. Hall

Journal of the Optical Society of America ANov 1, 19780 citations

Observation of Ramsey Fringes Using a Stimulated, Resonance Raman Transition in a Sodium Atomic Beam

John E. Thomas, Philip Hemmer, Shaoul Ezekiel +3 more

Ramsey fringes have been observed using a stimulated, resonance Raman transition at 1772 MHz excited by two dye lasers in a sodium atomic beam. The width of the central fringe is 650 Hz (half width at half maximum), corresponding to a 30-cm interaction-region separation. The fringes are free from laser jitter because the jitters in both laser beams are correlated. Applications to frequency standards as well as to high-resolution spectroscopy in the microwave to far-ir regions are discussed.

Physical Review LettersMar 29, 1982219 citations

Demonstration of Raman–Ramsey fringes using time delayed optical pulses in rubidium vapor

G. S. Pati, K. Salit, Renu Tripathi +1 more

Optics CommunicationsJul 1, 200830 citations

Towards a cold atom gravimeter

Andrew Chew

This thesis describes the construction of a portable cold atom gravimeter with the aim to be employed in remote locations. Two species of alkali atoms would be eventually used, namely Rubidium-87 and Cesium-133. The advantage of such a system is shorter duty cycle, and shorter dead time. In this thesis we focus on the experimental realization of a Rubidium-87 gravimeter, using the Ramsey-Bord´e interferometry method first described by C. Bord´e, and employed by Kasevich et. al. Approximately 10^8 atoms are laser cooled and trapped to a MOT and further cooled by a optical molasses to a temperature of 12μK. Two counterpropagating Raman beams separated by a frequency matching the ground state hyperfine splitting will be used to excite stimulated Raman transitions to place the atoms into a superposition of the two ground metastable states. This thesis describes in detail the vacuum system and the laser systems built to cool and trap the atoms and to produce the Raman beams to perform the Ramsey sequence. The thesis covers also the relevant theory related to our experiment.This thesis describes the construction of a portable cold atom gravimeter with the aim to be employed in remote locations. Two species of alkali atoms would be eventually used, namely Rubidium-87 and Cesium-133. The advantage of such a system is shorter duty cycle, and shorter dead time. In this thesis we focus on the experimental realization of a Rubidium-87 gravimeter, using the Ramsey-Bord´e interferometry method first described by C. Bord´e, and employed by Kasevich et. al. Approximately 10^8 atoms are laser cooled and trapped to a MOT and further cooled by a optical molasses to a temperature of 12μK. Two counterpropagating Raman beams separated by a frequency matching the ground state hyperfine splitting will be used to excite stimulated Raman transitions to place the atoms into a superposition of the two ground metastable states. This thesis describes in detail the vacuum system and the laser systems built to cool and trap the atoms and to produce the Raman beams to perform the Ramsey sequence. The thesis covers also the relevant theory related to our experiment.

Jan 1, 20130 citations

Progress toward a Raman-Ramsey Clock Based on a Transverse Cooled Rubidium Beam

Pei-Qiang Yan, Weichen Jia, Yanying Feng

SummaryIn this paper we reported our progress toward an atomic beam clock based on a transverse cooled rubidium beam. The atomic beam is generated from an atomic oven and collimated via micro-channel arrays and a two-dimensional optical lattice. After optical pumping, the rubidium beam interacts with two spatially separated Raman beams with a π/2 − π/2 sequence. High contrast Raman-Ramsey fringes are observed by using fluorescence detection. Preliminary result shows that the estimated frequency stability of the atomic clock reaches $2.6 \times {10^{ - 11}}/\sqrt \tau $. The atomic beam clock is proposed as a part of atomic beam inertial navigation unit for field applications.SummaryIn this paper we reported our progress toward an atomic beam clock based on a transverse cooled rubidium beam. The atomic beam is generated from an atomic oven and collimated via micro-channel arrays and a two-dimensional optical lattice. After optical pumping, the rubidium beam interacts with two spatially separated Raman beams with a π/2 − π/2 sequence. High contrast Raman-Ramsey fringes are observed by using fluorescence detection. Preliminary result shows that the estimated frequency stability of the atomic clock reaches $2.6 \times {10^{ - 11}}/\sqrt \tau $. The atomic beam clock is proposed as a part of atomic beam inertial navigation unit for field applications.

Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)May 15, 20230 citations

Observation of Ramsey fringes using stimulated Raman transitions in a laser-cooled continuous rubidium atomic beam

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