arXiv:0912.2133 · Physical Review A

Transverse laser cooling of a thermal atomic beam of dysprosium

N. Leefer, A. Cingöz, B. S. Gerber-Siff, Arijit Sharma, Justin R. Torgerson, Dmitry Budker

Published Apr 29, 2010• 30 citations

Abstract

A thermal atomic beam of dysprosium atoms is cooled using the $4{f}^{10}6{s}^{2}(J=8)\ensuremath{\rightarrow}4{f}^{10}6s6p(J=9)$ transition at $421$ nm. The cooling is done via a standing light wave orthogonal to the atomic beam. Efficient transverse cooling to the Doppler limit is demonstrated for all observable isotopes of dysprosium. Branching ratios to metastable states are demonstrated to be $<$$5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}$. A scheme for enhancement of the nonzero-nuclear-spin-isotope cooling and a method for direct identification of possible trap states are proposed.

DOI: 10.1103/physreva.81.043427

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arXiv:0912.2133 · Physical Review A

Transverse laser cooling of a thermal atomic beam of dysprosium

N. Leefer, A. Cingöz, B. S. Gerber-Siff, Arijit Sharma, Justin R. Torgerson, Dmitry Budker

Published Apr 29, 2010• 30 citations

arXiv HTML PDF

Abstract

A thermal atomic beam of dysprosium atoms is cooled using the

4{f}^{10}6{s}^{2}(J=8)\ensuremath{\rightarrow}4{f}^{10}6s6p(J=9)

transition at

421

nm. The cooling is done via a standing light wave orthogonal to the atomic beam. Efficient transverse cooling to the Doppler limit is demonstrated for all observable isotopes of dysprosium. Branching ratios to metastable states are demonstrated to be

<$$5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}

. A scheme for enhancement of the nonzero-nuclear-spin-isotope cooling and a method for direct identification of possible trap states are proposed.

DOI: 10.1103/physreva.81.043427

Related papers

Hyperfine and Zeeman optical pumping and transverse laser cooling of a thermal atomic beam of dysprosium using a single 421-nm laser

Rohan Chakravarthy, Jonathan Agil, Arijit Sharma +2 more

We demonstrate the effect of Zeeman and hyperfine optical pumping and transverse laser cooling of a dysprosium (Dy) atomic beam on the 4 f 10 6 s 2 ( J = 8 ) → 4 f 10 6 s 6 p ( J = 9 ) transition at 421.291 nm. For Dy 163 , a custom-built electro-optic modulator is used to generate five frequency sidebands required to pump the atoms to the F = 10.5 ground-state hyperfine level, and the light polarization is chosen to pump the atoms to the m F = 10.5 Zeeman sublevel. The atoms are simultaneously laser cooled using a standing wave orthogonal to the atomic beam. The resulting polarized and cooled atomic beam will be used in fundamental physics experiments taking advantage of the “accidental” degeneracy of excited states in Dy, including the ongoing measurement of parity violation in this system.We demonstrate the effect of Zeeman and hyperfine optical pumping and transverse laser cooling of a dysprosium (Dy) atomic beam on the 4 f 10 6 s 2 ( J = 8 ) → 4 f 10 6 s 6 p ( J = 9 ) transition at 421.291 nm. For Dy 163 , a custom-built electro-optic modulator is used to generate five frequency sidebands required to pump the atoms to the F = 10.5 ground-state hyperfine level, and the light polarization is chosen to pump the atoms to the m F = 10.5 Zeeman sublevel. The atoms are simultaneously laser cooled using a standing wave orthogonal to the atomic beam. The resulting polarized and cooled atomic beam will be used in fundamental physics experiments taking advantage of the “accidental” degeneracy of excited states in Dy, including the ongoing measurement of parity violation in this system.

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Spectroscopy of a narrow-line laser-cooling transition in atomic dysprosium

Mingwu Lu, Seo Ho Youn, Benjamin Lev

The laser cooling and trapping of ultracold neutral dysprosium has been demonstrated recently using the broad, open, 421-nm cycling transition. Narrow-line magneto-optical trapping of Dy on longer wavelength transitions would enable the preparation of ultracold Dy samples suitable for loading optical dipole traps and subsequent evaporative cooling. We have identified the closed 741-nm cycling transition as a candidate for the narrow-line cooling of Dy. We present experimental data on the isotope shifts, the hyperfine constants $A$ and $B$ , and the decay rate of the 741-nm transition. In addition, we report a measurement of the 421-nm transition's linewidth, which agrees with previous measurements. We summarize the laser-cooling characteristics of these transitions as well as other narrow cycling transitions that may prove useful for cooling Dy.The laser cooling and trapping of ultracold neutral dysprosium has been demonstrated recently using the broad, open, 421-nm cycling transition. Narrow-line magneto-optical trapping of Dy on longer wavelength transitions would enable the preparation of ultracold Dy samples suitable for loading optical dipole traps and subsequent evaporative cooling. We have identified the closed 741-nm cycling transition as a candidate for the narrow-line cooling of Dy. We present experimental data on the isotope shifts, the hyperfine constants $A$ and $B$, and the decay rate of the 741-nm transition. In addition, we report a measurement of the 421-nm transition's linewidth, which agrees with previous measurements. We summarize the laser-cooling characteristics of these transitions as well as other narrow cycling transitions that may prove useful for cooling Dy.

arXiv:1009.2962Physical Review AJan 18, 201158 citations

A thermal atomic beam of dysprosium atoms is cooled using the

4{f}^{10}6{s}^{2}(J=8)\ensuremath{\rightarrow}4{f}^{10}6s6p(J=9)

transition at

421

<$$5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}4}

. A scheme for enhancement of the nonzero-nuclear-spin-isotope cooling and a method for direct identification of possible trap states are proposed.

A pulsed metastable argon beam is transversely cooled in one dimension via the closed 4s[11/2${]}_{2}^{\mathit{o}\mathrm{\ensuremath{-}}}

4p[21/2

{]}_{3}$ transition. A standing light wave, orthogonal to the atomic beam and located just at the source, provides the cooling. In all the measurements, the maximum electric field is equivalent to a Rabi frequency of \ensuremath{\sim}220 natural linewidths. The enhancement of the metastable atom flux is measured as a function of the interaction time with a time-of-flight technique. The dependence on the laser detuning is investigated and compared with theory.

A

and

B

, and the decay rate of the 741-nm transition. In addition, we report a measurement of the 421-nm transition's linewidth, which agrees with previous measurements. We summarize the laser-cooling characteristics of these transitions as well as other narrow cycling transitions that may prove useful for cooling Dy.