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Transferring cold atoms in double magneto-optical trap by a continuous-wave transfer laser beam with large red detuning

Junmin Wang, Jing Wang, Shubin Yan +2 more

A novel scheme of transferring cold atoms in a double magneto-optical trap (MOT) system has been experimentally demonstrated. Cold cesium atoms trapped in a vapor-cell MOT are efficiently transferred to an ultrahigh-vacuum (UHV) MOT by a continuous-wave divergent Gaussian transfer laser beam. When large red detuning and moderate intensity are adopted for the transfer laser beam, enhancement of the recapturing of atoms in the UHV MOT is clearly observed. Using the divergent transfer laser beam (diameter of approximately 1.60 mm in the vapor-cell MOT region) with typical power of approximately 20.2 mW, up to approximately 85% of transfer efficiency is obtained when the frequency detuning is set to around -1.2 GHz, and it is not sensitive to small detuning variation. This transfer is much efficient compared with that in the case of continuous-wave near-resonance weak transfer laser beam (typical power of order of approximately 100 microW and typical frequency detuning of approximately-10 MHz) which is normally used in double-MOT experiment. The enhancement is ascribed to the guiding effect on cold atomic flux by transverse dipole potential of the large red-detuned transfer laser beam.A novel scheme of transferring cold atoms in a double magneto-optical trap (MOT) system has been experimentally demonstrated. Cold cesium atoms trapped in a vapor-cell MOT are efficiently transferred to an ultrahigh-vacuum (UHV) MOT by a continuous-wave divergent Gaussian transfer laser beam. When large red detuning and moderate intensity are adopted for the transfer laser beam, enhancement of the recapturing of atoms in the UHV MOT is clearly observed. Using the divergent transfer laser beam (diameter of approximately 1.60 mm in the vapor-cell MOT region) with typical power of approximately 20.2 mW, up to approximately 85% of transfer efficiency is obtained when the frequency detuning is set to around -1.2 GHz, and it is not sensitive to small detuning variation. This transfer is much efficient compared with that in the case of continuous-wave near-resonance weak transfer laser beam (typical power of order of approximately 100 microW and typical frequency detuning of approximately-10 MHz) which is normally used in double-MOT experiment. The enhancement is ascribed to the guiding effect on cold atomic flux by transverse dipole potential of the large red-detuned transfer laser beam.

Review of Scientific InstrumentsDec 1, 200813 citations

Publisher's Note: Enhanced atom transfer in a double magneto-optical trap setup [Phys. Rev. A77, 065402 (2008)]

Satya Ram Mishra, Surjya Prakash Ram, S. K. Tiwari +1 more

Physical Review AJun 30, 20081 citation

Transportation of Cold Atoms in Double Magneto-Optical Trap with Continuous-Wave Large-Detuning Transfer Laser Beam

Junmin Wang

We have established a cesium double magneto-optical trap(double MOT) system,and realized transferring cold atoms from the vapor-cell MOT to the ultra-high-vacuum(UHV) MOT by continuous transfer laser.On the base of our former work on transferring atoms by weak resonance laser,we extended red detuning of transfer beam to 2.0 GHz,and increased the laser power.We have studied on the transportation of cold atoms.It is demonstrated that the stronger laser power would make the transportation much more efficient if the detuning is far off-resonance.It is induced by the confinement and guidance of cold atoms due to the transverse dipole force of the transfer beam.We have established a cesium double magneto-optical trap(double MOT) system,and realized transferring cold atoms from the vapor-cell MOT to the ultra-high-vacuum(UHV) MOT by continuous transfer laser.On the base of our former work on transferring atoms by weak resonance laser,we extended red detuning of transfer beam to 2.0 GHz,and increased the laser power.We have studied on the transportation of cold atoms.It is demonstrated that the stronger laser power would make the transportation much more efficient if the detuning is far off-resonance.It is induced by the confinement and guidance of cold atoms due to the transverse dipole force of the transfer beam.

Acta Sinica Quantum OpticaJan 1, 20080 citations

A Comparison of Pulsed and Continuous Atom Transfer between Two Magneto-optical Traps

Surjya Prakash Ram, S. K. Tiwari, Satya Ram Mishra

Journal of the Korean Physical SocietyNov 15, 20103 citations

Continuous transfer and laser guiding between two cold atom traps

Emiliya Dimova, Olivier Morizot, Guillaume Stern +6 more

arXiv:quant-ph/0609208The European Physical Journal DFeb 2, 200719 citations

Note: Investigation of atom transfer using a red-detuned push beam in a double magneto-optical trap setup

Surjya Prakash Ram, Satya Ram Mishra, S. K. Tiwari +1 more

We present our results on transfer of cold (87)Rb atoms from a vapor cell magneto-optical trap to ultrahigh vacuum magneto-optical trap (UHV-MOT) using a red-detuned continuous wave push beam in a double-magneto-optical trap setup. We find that use of retro-reflected red-detuned push laser beam results in higher number in UHV-MOT than the number obtained without retro-reflection of push beam.

Review of Scientific InstrumentsDec 1, 20114 citations

Comment on “Transferring cold atoms in double magneto-optical trap by a continuous-wave transfer laser beam with large red detuning” [Rev. Sci. Instrum. 79, 123116 (2008)]

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Comment on “Transferring cold atoms in double magneto-optical trap by a continuous-wave transfer laser beam with large red detuning” [Rev. Sci. Instrum. 79, 123116 (2008)]

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