A single trapped and cooled Ba + ion irradiated by 493 nm and 650 nm laser light shows multistability of its orbit when gently heated. Stimulated two-photon transitions 2 S 1/2 - 2 D 3/2 strongly contribute to the net light force.

Europhysics Letters (EPL)Oct 15, 198830 citations

Verhandlungen der Deutschen Physikalischen Gesellschaft

Laser cooling and heating of two trapped 138 Ba + ions

Dirk Reiß, Klaus Abich, Werner Neuhauser, C. Wunderlich, P. E. Toschek

Published Jan 1, 2001• 0 citations

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We study cooling of the collective vibrational motion of two ${}^{138}{\mathrm{Ba}}^{+}$ ions confined in an electrodynamic trap and irradiated by laser light close to the resonances ${S}_{1/2}\ensuremath{-}{P}_{1/2}$ (493 nm) and ${P}_{1/2}\ensuremath{-}{D}_{3/2}$ (650 nm). The motional state of the ions is monitored by a spatially resolving photomultiplier. Depending on detuning and intensity of the cooling lasers, macroscopically different motional states corresponding to different ion temperatures are observed. We also derive the ions' temperature from detailed analytical calculations of laser cooling taking into account the Zeeman structure of the energy levels involved. The observed motional states perfectly match the calculated temperatures. Significant heating is observed in the vicinity of the dark resonances of the Zeeman-split ${S}_{1/2}\ensuremath{-}{D}_{3/2}$ Raman transitions. Here two-photon processes dominate the interaction between lasers and ions. Parameter regimes of laser light are identified that imply most efficient laser cooling.We study cooling of the collective vibrational motion of two ${}^{138}{\mathrm{Ba}}^{+}$ ions confined in an electrodynamic trap and irradiated by laser light close to the resonances ${S}_{1/2}\ensuremath{-}{P}_{1/2}$ (493 nm) and ${P}_{1/2}\ensuremath{-}{D}_{3/2}$ (650 nm). The motional state of the ions is monitored by a spatially resolving photomultiplier. Depending on detuning and intensity of the cooling lasers, macroscopically different motional states corresponding to different ion temperatures are observed. We also derive the ions' temperature from detailed analytical calculations of laser cooling taking into account the Zeeman structure of the energy levels involved. The observed motional states perfectly match the calculated temperatures. Significant heating is observed in the vicinity of the dark resonances of the Zeeman-split ${S}_{1/2}\ensuremath{-}{D}_{3/2}$ Raman transitions. Here two-photon processes dominate the interaction between lasers and ions. Parameter regimes of laser light are identified that imply most efficient laser cooling.

arXiv:quant-ph/0104002Physical Review AApr 12, 200233 citations

Kinetics of a Single Trapped Ion: Multistability and Stimulated Two-Photon Light Force

Thilo Sauter, H. Gilhaus, Werner Neuhauser +2 more

Europhysics Letters (EPL)Oct 15, 198830 citations

We study cooling of the collective vibrational motion of two

{}^{138}{\mathrm{Ba}}^{+}

ions confined in an electrodynamic trap and irradiated by laser light close to the resonances ${S}_{1/2}\ensuremath{-}{P}_{1/2}$ (493 nm) and ${P}_{1/2}\ensuremath{-}{D}_{3/2}$ (650 nm). The motional state of the ions is monitored by a spatially resolving photomultiplier. Depending on detuning and intensity of the cooling lasers, macroscopically different motional states corresponding to different ion temperatures are observed. We also derive the ions' temperature from detailed analytical calculations of laser cooling taking into account the Zeeman structure of the energy levels involved. The observed motional states perfectly match the calculated temperatures. Significant heating is observed in the vicinity of the dark resonances of the Zeeman-split ${S}_{1/2}\ensuremath{-}{D}_{3/2}$ Raman transitions. Here two-photon processes dominate the interaction between lasers and ions. Parameter regimes of laser light are identified that imply most efficient laser cooling.