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Time averaged optical dipole traps for cold atoms

Peyman Ahmadi, Brian P. Timmons, Gil S. Summy

Bulletin of the American Physical SocietyMay 18, 20050 citations

Loading cold atoms into a time averaged optical dipole trap

Peyman Ahmadi, Brian P. Timmons, Gil S. Summy

Bulletin of the American Physical SocietyMay 19, 20050 citations

Increased coherence time in microwave "echo" spectroscopy of cold atoms in an optical dipole trap

Ariel Kaplan, Mikkel F. Andersen, Tzahi Grünzweig +1 more

The loss in coherence in a trapped-atoms “echo” experiment is suppressed by a different pulse sequence. The coherence time is then limited by mixing to other vibrational levels and the lifetime of the internal states.

Conference on Lasers and Electro-OpticsJan 1, 20040 citations

Echo Spectroscopy and Quantum Stability of Trapped Atoms

Mikkel F. Andersen, Ariel Kaplan, Nir Davidson

We investigate the dephasing of ultra cold 85Rb atoms trapped in an optical dipole trap and prepared in a coherent superposition of their two hyperfine ground states by interaction with a microwave pulse. We demonstrate that the dephasing, measured as the Ramsey fringe contrast, can be reversed by stimulating a coherence echo with a pi pulse between the two pi / 2 pulses, in analogy to the photon echo. We also demonstrate that "echo spectroscopy" can be used to study the quantum dynamics in the trap even when more than 10(6) states are thermally populated and to study the crossover from quantum to classical dynamics.We investigate the dephasing of ultra cold 85Rb atoms trapped in an optical dipole trap and prepared in a coherent superposition of their two hyperfine ground states by interaction with a microwave pulse. We demonstrate that the dephasing, measured as the Ramsey fringe contrast, can be reversed by stimulating a coherence echo with a pi pulse between the two pi / 2 pulses, in analogy to the photon echo. We also demonstrate that "echo spectroscopy" can be used to study the quantum dynamics in the trap even when more than 10(6) states are thermally populated and to study the crossover from quantum to classical dynamics.

arXiv:quant-ph/0208052Physical Review LettersJan 13, 200399 citations

Coherence of cold atoms trapped by partially coherent light

Delong Kong, Mengdi Luo, Zhaoying Wang +1 more

Optics CommunicationsOct 31, 20184 citations

Echo spectroscopy and Atom Optics Billiards

Mikkel F. Andersen, Ariel Kaplan, Tzahi Grünzweig +1 more

We discuss a recently demonstrated type of microwave spectroscopy of trapped ultra-cold atoms known as ”echo spectroscopy ” [M.F. Andersen et. al., Phys. Rev. Lett., in press (2002)]. Echo spectroscopy can serve as an extremely sensitive experimental tool for investigating quantum dynamics of trapped atoms even when a large number of states are thermally populated. We show numerical results for the stability of eigenstates of an atom-optics billiard of the Bunimovich type, and discuss its behavior under different types of perturbations. Finally, we propose to use special geometrical constructions to make a dephasing free dipole trap. Key words: PACS:We discuss a recently demonstrated type of microwave spectroscopy of trapped ultra-cold atoms known as ”echo spectroscopy ” [M.F. Andersen et. al., Phys. Rev. Lett., in press (2002)]. Echo spectroscopy can serve as an extremely sensitive experimental tool for investigating quantum dynamics of trapped atoms even when a large number of states are thermally populated. We show numerical results for the stability of eigenstates of an atom-optics billiard of the Bunimovich type, and discuss its behavior under different types of perturbations. Finally, we propose to use special geometrical constructions to make a dephasing free dipole trap. Key words: PACS:

Jan 1, 20022 citations

Increased coherence time in microwave "echo" spectroscopy of cold atoms in an optical dipole trap

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Increased coherence time in microwave "echo" spectroscopy of cold atoms in an optical dipole trap

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