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IEICE Technical Report; IEICE Tech. Rep.

Laser cooling of Ba ions in a linear RF ion trap by using diode lasers

Tadayuki Yoshitake, Kazuhiko Sugiyama, Takeshita Kengo, Kitano Masao

Published May 26, 2006• 0 citations
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An empirical study of sympathetic cooling using a large single-species ion cloud

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Abstract Sympathetic cooling is an important technique for achieving low motional temperatures in trapped ion systems that cannot be directly laser cooled. In this paper, we report on the sympathetic cooling of large samples (5 × 10 4 ) of Ba + ions which have been optically pumped into a dark state, using laser cooled Ba + ions in a linear radiofrequency (RF) ion trap. The trap lifetime was evaluated with different dark ion fractions as a function of the RF amplitude, the DC trapping potentials, the power and frequency of the cooling lasers, the quality of the vacuum, and the total number of ions. We found that the RF amplitude was the dominant factor contributing to the loss of ions, and that under optimal conditions and with a dark ion fraction as high as 85%, no losses were observed over 100 s long measurement periods, and fewer than 10% of the ions were lost after 1000 s.

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Simulating cold atomic hydrogen production in linear radiofrequency ion traps

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Abstract We simulated the motion of BaH + molecular ions which are sympathetically cooled by laser-cooled Ba + ions in linear quadrupole and octupole radiofrequency (RF) ion traps. By varying the trap voltages, we studied the velocity distribution of hydrogen atoms that would be produced upon threshold photodissociation of the BaH + . We found that hydrogen with a kinetic energy below 30 mK × k B can be produced in both traps, making the scheme suitable for loading hybrid ion–atom traps such as those used to synthesize and trap antihydrogen or study ultracold atom–ion collisions. We discuss how the dynamics of RF traps could be exploited to produce hydrogen below this limit by either driving the photodissociation transition with a small laser beam aligned along the axis of the trap, or by pulsing the laser during the micromotion turning points.

New Journal of Physics•Sep 1, 2025•0 citations
Abstract Sympathetic cooling is an important technique for achieving low motional temperatures in trapped ion systems that cannot be directly laser cooled. In this paper, we report on the sympathetic cooling of large samples (5 × 10 4 ) of Ba + ions which have been optically pumped into a dark state, using laser cooled Ba + ions in a linear radiofrequency (RF) ion trap. The trap lifetime was evaluated with different dark ion fractions as a function of the RF amplitude, the DC trapping potentials, the power and frequency of the cooling lasers, the quality of the vacuum, and the total number of ions. We found that the RF amplitude was the dominant factor contributing to the loss of ions, and that under optimal conditions and with a dark ion fraction as high as 85%, no losses were observed over 100 s long measurement periods, and fewer than 10% of the ions were lost after 1000 s.
Abstract We simulated the motion of BaH + molecular ions which are sympathetically cooled by laser-cooled Ba + ions in linear quadrupole and octupole radiofrequency (RF) ion traps. By varying the trap voltages, we studied the velocity distribution of hydrogen atoms that would be produced upon threshold photodissociation of the BaH + . We found that hydrogen with a kinetic energy below 30 mK × k B can be produced in both traps, making the scheme suitable for loading hybrid ion–atom traps such as those used to synthesize and trap antihydrogen or study ultracold atom–ion collisions. We discuss how the dynamics of RF traps could be exploited to produce hydrogen below this limit by either driving the photodissociation transition with a small laser beam aligned along the axis of the trap, or by pulsing the laser during the micromotion turning points.