Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)

Sub-Doppler cooling with the 1S0-1P1 line in ytterbium

Nikita Kostylev, Eugene N. Ivanov, Michael Edmund Tobar, John J. McFerran

Published May 1, 2014• 0 citations

Publisher

Abstract

We have studied the temperatures of several neutral Yb isotopes in a magneto-optical trap (MOT) using the1S0-1P1transition at 398.9 nm. We use a compact MOT with a titanium vacuum chamber and a high degree of othogonality between the beams. Minimum temperatures of 170 μK and 80 μK are recorded for171Yb, and173Yb, respectively, while 0.95 mK is measured for172Yb. By comparison the 1D Doppler cooling temperature limit is 694 μK. The results augur well for future lattice clocks that use Yb. We comment on the significance of sub-Doppler cooling of atoms with ground-state total angular momentum F =1/2, as is the case for171Yb.

DOI: 10.1109/fcs.2014.6859900

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Joint Conference of the European Frequency and Time Forum and IEEE International Frequency Control Symposium (EFTF/IFCS)

Sub-Doppler cooling with the 1S0-1P1 line in ytterbium

Nikita Kostylev, Eugene N. Ivanov, Michael Edmund Tobar, John J. McFerran

Published May 1, 2014• 0 citations

Publisher

Abstract

DOI: 10.1109/fcs.2014.6859900

Related papers

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We report on the sub-Doppler laser cooling of neutral Yb171 and Yb173 in a magneto-optical trap (MOT) using the S10−P11 transition at 398.9 nm. We use two independent means to estimate the temperature of the atomic cloud for several of the Yb isotopes. The two methods of MOT cloud imaging and release-and-recapture show consistency with one another. Temperatures below 400 and 200 μK are recorded for Yb171 and Yb173, respectively, while ∼1 mK is measured for both Yb172 and Yb174. By comparison, the associated one-dimensional Doppler cooling temperature limit is 694 μK. The sub-Doppler cooling of the I=1/2Yb171 isotope in a σ+−σ− light-field trap adds further evidence that the Sisyphus cooling mechanism is occurring in such three-dimensional MOTs.We report on the sub-Doppler laser cooling of neutral Yb171 and Yb173 in a magneto-optical trap (MOT) using the S10−P11 transition at 398.9 nm. We use two independent means to estimate the temperature of the atomic cloud for several of the Yb isotopes. The two methods of MOT cloud imaging and release-and-recapture show consistency with one another. Temperatures below 400 and 200 μK are recorded for Yb171 and Yb173, respectively, while ∼1 mK is measured for both Yb172 and Yb174. By comparison, the associated one-dimensional Doppler cooling temperature limit is 694 μK. The sub-Doppler cooling of the I=1/2Yb171 isotope in a σ+−σ− light-field trap adds further evidence that the Sisyphus cooling mechanism is occurring in such three-dimensional MOTs.

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Chris W. Oates, Chad Hoyt, Zeb W. Barber +3 more

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Conference on Lasers and Electro-OpticsJan 1, 20050 citations

We report experimental evidence of Sisyphus cooling in atoms with a

{}^{1}{S}_{0}

ground state. Since

J=0,

any cooling mechanism which requires multiple sublevels can only occur in the isotopes which have nuclear spin $I\ensuremath{\ne}0.$ Ytterbium has seven stable isotopes and offers a unique system in which we can study cooling on $F=\stackrel{\ensuremath{\rightarrow}}{0}1$

{(}^{168,170,172,174,176}\mathrm{Yb}),

$F=1/\stackrel{\ensuremath{\rightarrow}}{2}3/2$

{(}^{171}\mathrm{Yb}),

and $F=5/\stackrel{\ensuremath{\rightarrow}}{2}7/2$

{(}^{173}\mathrm{Yb}),

depending on the selection of isotope. We have trapped each of the seven stable isotopes of ytterbium in a magneto-optical trap (MOT) using the strong ${}^{1}{S}_{0}{\ensuremath{-}}^{1}{P}_{1}$ transition, and transferred them into a second MOT which uses the much narrower ${}^{1}{S}_{0}{\ensuremath{-}}^{3}{P}_{1}$ intercombination transition. We have measured the temperature of isotopes

{}^{171}\mathrm{Yb},

{}^{173}\mathrm{Yb},

and

{}^{174}\mathrm{Yb}

in the ${}^{1}{S}_{0}{\ensuremath{-}}^{3}{P}_{1}$ MOT, as a function of the intensity and detuning of the trapping laser. The temperature of

{}^{174}\mathrm{Yb}

was found to increase more rapidly with intensity than predicted by Doppler cooling theory, in agreement with earlier work on alkaline-earth atoms. In the odd isotopes the temperature was found to decrease with increasing angular momentum, as observed in earlier experiments and three-dimensional simulations.