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Improved trapping and transport of cold atoms for magnetic microscopy

Amruta Gadge, T. A. James, X. Li +8 more

Bulletin of the American Physical SocietyMay 24, 20160 citations

Mesoscopic dynamics of fermionic cold atoms — Quantitative analysis of transport coefficients and relaxation times

Yuta Kikuchi, Kyosuke Tsumura, Teiji Kunihiro

arXiv:1511.04675Physics Letters AMay 1, 201614 citations

Out-of-equilibrium phenomena and Transport in Cold Atoms

Thierry Giamarchi

Bulletin of the American Physical SocietyMar 14, 20160 citations

Comparison of two absorption imaging methods to detect cold atoms in magnetic trap

Yan Wang, Zhaohui Hu, Lu Qi

Two methods of absorption imaging to detect cold atoms in a magnetic trap are implemented for a high-precision cold atom interferometer. In the first method, a probe laser which is in resonance with a cycle transition frequency is used to evaluate the quantity and distribution of the atom sample. In the second method, the probe laser is tuned to an open transition frequency, which stimulates a few and constant number of photons per atom. This method has a shorter interaction time and results in absorption images which are not affected by the magnetic field and the light field. We make a comparison of performance between these two imaging methods in the sense of parameters such as pulse duration, light intensity, and magnetic field strength. The experimental results show that the second method is more reliable when detecting the quantity and density profiles of the atoms. These results fit well to the theoretical analysis.Two methods of absorption imaging to detect cold atoms in a magnetic trap are implemented for a high-precision cold atom interferometer. In the first method, a probe laser which is in resonance with a cycle transition frequency is used to evaluate the quantity and distribution of the atom sample. In the second method, the probe laser is tuned to an open transition frequency, which stimulates a few and constant number of photons per atom. This method has a shorter interaction time and results in absorption images which are not affected by the magnetic field and the light field. We make a comparison of performance between these two imaging methods in the sense of parameters such as pulse duration, light intensity, and magnetic field strength. The experimental results show that the second method is more reliable when detecting the quantity and density profiles of the atoms. These results fit well to the theoretical analysis.

Chinese Physics BFeb 1, 20151 citation

Optimal transport of cold atoms by modulating the velocity of traps

Jing-Shan Han, Xinping Xu, Haichao Zhang +1 more

This work experimentally demonstrates a new method of optimizing the transport of cold atoms via modulating the velocity profile imposed on a magnetic quadrupole trap. The trap velocity and corresponding modulation are controlled by varying the currents of two pairs of anti-Helmholtz coils. Cold 87 Rb atoms are transported in a non-adiabatic regime over 22 mm in 200 ms. For the transported atoms their final-vibration amplitude dependences of modulation period number, depth, and initial phase are investigated. With modulation period n =5, modulation depth K =0.55, and initial phase φ=0, cold atom clouds with more atom numbers, smaller final-vibration amplitude, and lower temperature are efficiently transported. Theoretical analysis and numerical simulation are also provided, which are in good agreement with experimental results.This work experimentally demonstrates a new method of optimizing the transport of cold atoms via modulating the velocity profile imposed on a magnetic quadrupole trap. The trap velocity and corresponding modulation are controlled by varying the currents of two pairs of anti-Helmholtz coils. Cold 87 Rb atoms are transported in a non-adiabatic regime over 22 mm in 200 ms. For the transported atoms their final-vibration amplitude dependences of modulation period number, depth, and initial phase are investigated. With modulation period n =5, modulation depth K =0.55, and initial phase φ=0, cold atom clouds with more atom numbers, smaller final-vibration amplitude, and lower temperature are efficiently transported. Theoretical analysis and numerical simulation are also provided, which are in good agreement with experimental results.

Chinese Physics BFeb 1, 20135 citations

Magnetic guiding of cold atoms in radio-frequency waveguide

马红玉 Ma Hongyu, 韩一平 Han Yiping

High Power Laser and Particle BeamsJan 1, 20120 citations

Comparison of time profiles for the magnetic transport of cold atoms

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