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Title: Simultaneous magneto-optical trapping of three atomic species

Abstract

We report on the simultaneous trapping of two fermionic species, {sup 6}Li and {sup 40}K, and a bosonic species, {sup 87}Rb, demonstrating the first three-species magneto-optical trap ('triple MOT'). The apparatus including the atom sources and the three laser systems is described, and the single-species MOTs and the triple MOT are characterized. In triple MOT operation, typical atom numbers of 3.2x10{sup 7} for {sup 6}Li, 1.5x10{sup 7} for {sup 40}K, and 5.4x10{sup 9} for {sup 87}Rb were achieved. Trap loss due to interspecies collisions was observed. We describe our way to optimize the triple MOT and turn it into a suitable source for the goal to achieve quantum degeneracy by evaporative and sympathetic cooling.

Authors:
; ; ; ; ;  [1]
  1. Department fuer Physik der Ludwig-Maximilians-Universitaet, Schellingstrasse 4, 80799 Munich (Germany) and Max-Planck-Institut fuer Quantenoptik, 85748 Garching (Germany)
Publication Date:
OSTI Identifier:
20786625
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 73; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevA.73.011402; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ATOM COLLISIONS; ATOMS; BOSONS; COOLING; FERMIONS; LASER RADIATION; LITHIUM; LITHIUM 6; MAGNETO-OPTICAL EFFECTS; POTASSIUM; POTASSIUM 40; RUBIDIUM; RUBIDIUM 87; TRAPPING; TRAPS

Citation Formats

Taglieber, M., Voigt, A.-C., Henkel, F., Fray, S., Haensch, T. W., and Dieckmann, K.. Simultaneous magneto-optical trapping of three atomic species. United States: N. p., 2006. Web. doi:10.1103/PHYSREVA.73.0.
Taglieber, M., Voigt, A.-C., Henkel, F., Fray, S., Haensch, T. W., & Dieckmann, K.. Simultaneous magneto-optical trapping of three atomic species. United States. doi:10.1103/PHYSREVA.73.0.
Taglieber, M., Voigt, A.-C., Henkel, F., Fray, S., Haensch, T. W., and Dieckmann, K.. Sun . "Simultaneous magneto-optical trapping of three atomic species". United States. doi:10.1103/PHYSREVA.73.0.
@article{osti_20786625,
title = {Simultaneous magneto-optical trapping of three atomic species},
author = {Taglieber, M. and Voigt, A.-C. and Henkel, F. and Fray, S. and Haensch, T. W. and Dieckmann, K.},
abstractNote = {We report on the simultaneous trapping of two fermionic species, {sup 6}Li and {sup 40}K, and a bosonic species, {sup 87}Rb, demonstrating the first three-species magneto-optical trap ('triple MOT'). The apparatus including the atom sources and the three laser systems is described, and the single-species MOTs and the triple MOT are characterized. In triple MOT operation, typical atom numbers of 3.2x10{sup 7} for {sup 6}Li, 1.5x10{sup 7} for {sup 40}K, and 5.4x10{sup 9} for {sup 87}Rb were achieved. Trap loss due to interspecies collisions was observed. We describe our way to optimize the triple MOT and turn it into a suitable source for the goal to achieve quantum degeneracy by evaporative and sympathetic cooling.},
doi = {10.1103/PHYSREVA.73.0},
journal = {Physical Review. A},
number = 1,
volume = 73,
place = {United States},
year = {Sun Jan 15 00:00:00 EST 2006},
month = {Sun Jan 15 00:00:00 EST 2006}
}
  • We have produced a magneto-optical trap that simultaneously confines two different atomic species: sodium and potassium. A measurement of the sodium trap loss rate constant due to collisions with cold potassium atoms was performed. We extract this rate constant by measuring the temporal behavior of the loading process of the sodium trap in the presence and absence of cold potassium. The constant that is obtained can be qualitatively explained using simple existing models. Future applications of simultaneous trapping are discussed.
  • We have simultaneously confined rubidium and metastable argon in a dual-species magneto-optical trap (MOT). Here a binary mixture of atomic species from different groups of the periodic table have been optically confined at ultracold temperatures. We describe the apparatus and characterize the individual, single species MOTs and the dual-species MOT. Both fluorescence and ion production are monitored. With both species trapped, we observe {approx}5x10{sup 6} {sup 85}Rb atoms and {approx}2x10{sup 6} {sup 40}Ar* atoms. Realization of the dual-species trap opens the way for detailed studies of Penning and associative ionization, photoassociative spectroscopy, and eventually for the production of bound, ultracoldmore » RbAr molecules.« less
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  • We experimentally investigate one-dimensional (1D) expansion of a cold cloud of cesium atoms in orthogonal 2D configuration of near resonant laser beams by temporally modulating a pair of counterpropagating trapping beams of a magneto-optical trap (MOT). The cloud is observed to undergo ballistic expansion followed by superballistic explosive growth due to the fluctuations of the 2D radiation force. A model based on the theory of Brownian motion is developed and a comparison of experiments with theory is shown to provide a direct measure of the velocity diffusion coefficient. We also observe sudden contraction of the cloud immediately after switching offmore » the pair of trapping beams, which provides direct evidence for the existence of the radiation trapping force in a MOT.« less
  • As part of an effort to measure parity non-conserving atomic transition rates in a series of Cs radioisotopes, the authors are working on the efficient coupling of a magneto-optical trap (MOT) to a mass separator. They have established a test stand for optical trapping which is used for the off-line development of a high-efficiency MOT. Their trap features a dry-film coated cell with large (5 cm) windows to permit the use of large diameter, high power laser beams to increase the efficiency of the trapping process. Studies of the effect of detuning, magnetic field gradient, laser beam intensity and differentmore » beam sizes on the number of trapped atoms are presented.« less