Physical Review A

Enhanced atom transfer in a double magneto-optical trap setup

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

Published Jun 19, 2008• 10 citations

Abstract

We report the observation of significant enhancement in the transfer of laser-cooled $^{87}\text{R}\text{b}$ atoms between two vertically separated magneto-optical traps (MOTs) when an appropriately tuned and aligned hollow laser beam was used. In the experimental setup, the lower MOT was loaded from a continuous flux of atoms ejected from the upper MOT by a resonant push beam. The observed enhancement appears to be mainly due to a slowing down of atoms by the hollow beam after being ejected from the upper MOT.

DOI: 10.1103/physreva.77.065402

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Physical Review A

Enhanced atom transfer in a double magneto-optical trap setup

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

Published Jun 19, 2008• 10 citations

Publisher

Abstract

We report the observation of significant enhancement in the transfer of laser-cooled

^{87}\text{R}\text{b}

atoms between two vertically separated magneto-optical traps (MOTs) when an appropriately tuned and aligned hollow laser beam was used. In the experimental setup, the lower MOT was loaded from a continuous flux of atoms ejected from the upper MOT by a resonant push beam. The observed enhancement appears to be mainly due to a slowing down of atoms by the hollow beam after being ejected from the upper MOT.

DOI: 10.1103/physreva.77.065402

Related papers

Improved transfer efficiency with pulsed atom transfer between two magneto-optical traps

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

In our double magneto-optical trap (MOT) setup containing a vapor chamber MOT (VC-MOT) and an ultra high vacuum MOT (UHV-MOT) for $^{87}$ Rb atoms, we find that transfer of atoms from VC-MOT to UHV-MOT can be enhanced by employing a pulsed VC-MOT loading followed by a pulsed push beam, as compared to that obtained by focusing a continuous wave (CW) push beam on a continuously loaded VC-MOT. By choosing appropriately the VC-MOT duration and push beam duration, the number of atoms in UHV-MOT was $\sim$3-times the number obtained with a continuous VC-MOT and a CW push beam of optimized power. The processes affecting the pulsed transfer have been studied.In our double magneto-optical trap (MOT) setup containing a vapor chamber MOT (VC-MOT) and an ultra high vacuum MOT (UHV-MOT) for $^{87}$Rb atoms, we find that transfer of atoms from VC-MOT to UHV-MOT can be enhanced by employing a pulsed VC-MOT loading followed by a pulsed push beam, as compared to that obtained by focusing a continuous wave (CW) push beam on a continuously loaded VC-MOT. By choosing appropriately the VC-MOT duration and push beam duration, the number of atoms in UHV-MOT was $\sim$3-times the number obtained with a continuous VC-MOT and a CW push beam of optimized power. The processes affecting the pulsed transfer have been studied.

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Rajnandan Choudhury Das, Thilagaraj Ravi, Samir Khan +1 more

We report continuous loading of $^{\text{87}}\mathrm{Rb}$ atoms in a magneto-optical trap (MOT) at narrow linewidth, 420-nm $5{S}_{1/2}$ , $F=2\ensuremath{\rightarrow}6{P}_{3/2}$, $F=3$ blue transition (blue MOT). Continuous loading of the blue MOT is achieved by superimposing the blue laser beam inside a hollow core of infrared (IR) laser beam driving the broad $5{S}_{1/2}$ , $F=2\ensuremath{\rightarrow}5{P}_{3/2}$, $F=3$ transition at 780 nm. We typically load $\ensuremath{\sim}{10}^{8}$ atoms in the blue MOT in 2.5 s. We characterize the continuous loading of the blue MOT with various parameters such as magnetic-field gradient, detuning, power and diameter of the blue MOT beam, and diameter of the hollow core (spot) inside the IR MOT beam. We observe that the blue laser beam should overfill the spot of the IR laser beam. This is because the blue laser cools the atoms to a lower temperature even in the presence of the broad IR laser, i.e., in the overlapped region, and hence helps in loading. To support the experimental result, we also present the theoretical framework for cooling atoms in the presence of two lasers driving two different transitions simultaneously. This method of continuous loading of the blue MOT can be useful to produce a continuous atomic beam of cold Rb atoms.We report continuous loading of $^{\text{87}}\mathrm{Rb}$ atoms in a magneto-optical trap (MOT) at narrow linewidth, 420-nm $5{S}_{1/2}$, $F=2\ensuremath{\rightarrow}6{P}_{3/2}$, $F=3$ blue transition (blue MOT). Continuous loading of the blue MOT is achieved by superimposing the blue laser beam inside a hollow core of infrared (IR) laser beam driving the broad $5{S}_{1/2}$, $F=2\ensuremath{\rightarrow}5{P}_{3/2}$, $F=3$ transition at 780 nm. We typically load $\ensuremath{\sim}{10}^{8}$ atoms in the blue MOT in 2.5 s. We characterize the continuous loading of the blue MOT with various parameters such as magnetic-field gradient, detuning, power and diameter of the blue MOT beam, and diameter of the hollow core (spot) inside the IR MOT beam. We observe that the blue laser beam should overfill the spot of the IR laser beam. This is because the blue laser cools the atoms to a lower temperature even in the presence of the broad IR laser, i.e., in the overlapped region, and hence helps in loading. To support the experimental result, we also present the theoretical framework for cooling atoms in the presence of two lasers driving two different transitions simultaneously. This method of continuous loading of the blue MOT can be useful to produce a continuous atomic beam of cold Rb atoms.

arXiv:2401.08286Physical Review AJun 10, 20247 citations

We report the observation of significant enhancement in the transfer of laser-cooled

^{87}\text{R}\text{b}

In our double magneto-optical trap (MOT) setup containing a vapor chamber MOT (VC-MOT) and an ultra high vacuum MOT (UHV-MOT) for

^{87}

Rb atoms, we find that transfer of atoms from VC-MOT to UHV-MOT can be enhanced by employing a pulsed VC-MOT loading followed by a pulsed push beam, as compared to that obtained by focusing a continuous wave (CW) push beam on a continuously loaded VC-MOT. By choosing appropriately the VC-MOT duration and push beam duration, the number of atoms in UHV-MOT was $\sim$3-times the number obtained with a continuous VC-MOT and a CW push beam of optimized power. The processes affecting the pulsed transfer have been studied.

We report continuous loading of

^{\text{87}}\mathrm{Rb}

atoms in a magneto-optical trap (MOT) at narrow linewidth, 420-nm

5{S}_{1/2}

, $F=2\ensuremath{\rightarrow}6{P}_{3/2}$,

F=3

blue transition (blue MOT). Continuous loading of the blue MOT is achieved by superimposing the blue laser beam inside a hollow core of infrared (IR) laser beam driving the broad

5{S}_{1/2}

, $F=2\ensuremath{\rightarrow}5{P}_{3/2}$,

F=3

transition at 780 nm. We typically load $\ensuremath{\sim}{10}^{8}$ atoms in the blue MOT in 2.5 s. We characterize the continuous loading of the blue MOT with various parameters such as magnetic-field gradient, detuning, power and diameter of the blue MOT beam, and diameter of the hollow core (spot) inside the IR MOT beam. We observe that the blue laser beam should overfill the spot of the IR laser beam. This is because the blue laser cools the atoms to a lower temperature even in the presence of the broad IR laser, i.e., in the overlapped region, and hence helps in loading. To support the experimental result, we also present the theoretical framework for cooling atoms in the presence of two lasers driving two different transitions simultaneously. This method of continuous loading of the blue MOT can be useful to produce a continuous atomic beam of cold Rb atoms.