Frontiers in Optics

Ultracold Collisions in Atomic Strontium

T. C. Killian, Y. N. Martinez, Pascal G. Mickelson, Sarah Nagel, Philippe Pellegrini, Robin Côté

Published Jan 1, 2007• 2 citations

Abstract

Photoassociative spectroscopy in an intercombination-line magneto-optical trap has determined the ground state s-wave scattering lengths of 88Sr and 86Sr, and recent work with a crossed optical dipole trap allows us to study atoms in metastable states.

DOI: 10.1364/ls.2007.lwh1

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Frontiers in Optics

Ultracold Collisions in Atomic Strontium

T. C. Killian, Y. N. Martinez, Pascal G. Mickelson, Sarah Nagel, Philippe Pellegrini, Robin Côté

Published Jan 1, 2007• 2 citations

Publisher

Abstract

DOI: 10.1364/ls.2007.lwh1

Related papers

Spectroscopic Determination of the s -Wave Scattering Lengths of Sr86 and Sr88

Pascal G. Mickelson, Y. N. Martinez, A. D. Saenz +5 more

We report the use of photoassociative spectroscopy to determine the ground-state $s$ -wave scattering lengths for the main bosonic isotopes of strontium, $^{86}\mathrm{Sr}$ and $^{88}\mathrm{Sr}$ . Photoassociative transitions are driven with a laser red detuned by up to 1400 GHz from the $^{1}S_{0}\mathrm{\text{\ensuremath{-}}}^{1}P_{1}$ atomic resonance at 461 nm. A minimum in the transition amplitude for $^{86}\mathrm{Sr}$ at $\ensuremath{-}494\ifmmode\pm\else\textpm\fi{}5\text{ }\text{ }\mathrm{GHz}$ allows us to determine the scattering lengths $610{a}_{0}<{a}_{86}<2300{a}_{0}$ for $^{86}\mathrm{Sr}$ and a much smaller value of $\ensuremath{-}1{a}_{0}<{a}_{88}<13{a}_{0}$ for $^{88}\mathrm{Sr}$ .We report the use of photoassociative spectroscopy to determine the ground-state $s$-wave scattering lengths for the main bosonic isotopes of strontium, $^{86}\mathrm{Sr}$ and $^{88}\mathrm{Sr}$. Photoassociative transitions are driven with a laser red detuned by up to 1400 GHz from the $^{1}S_{0}\mathrm{\text{\ensuremath{-}}}^{1}P_{1}$ atomic resonance at 461 nm. A minimum in the transition amplitude for $^{86}\mathrm{Sr}$ at $\ensuremath{-}494\ifmmode\pm\else\textpm\fi{}5\text{ }\text{ }\mathrm{GHz}$ allows us to determine the scattering lengths $610{a}_{0}<{a}_{86}<2300{a}_{0}$ for $^{86}\mathrm{Sr}$ and a much smaller value of $\ensuremath{-}1{a}_{0}<{a}_{88}<13{a}_{0}$ for $^{88}\mathrm{Sr}$.

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PHOTOASSOCIATION OF ULTRACOLD ATOMS: A NEW TOOL FOR MOLECULAR SPECTROSCOPY

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The field of laser cooling and trapping of atoms has had a profound impact on many areas of atomic, molecular and optical science. In particular, ultracold atoms colliding in magneto-optical traps typically have relative kinetic energies of $300\\mu K (\\sim 7 MHz)$ , so free-bound absorption lines are as sharp as bound-bound lines. Moreover, because of very long range centrifugal barriers, only a few collisional partial waves are important ( $J^{\\prime\\prime} = 0, 1$ and 2 in our work on $^{39}K$ ). Such photoassociative free-bound absorption allows observation of ``pure long-range molecule'' states ( $R_{e} = 28$ and 39 {\\AA} in $^{39}K_{2}$ ) as well as long-range levels of known short range states with outer classical turning points of $\\sim 20 - 250 {\\AA}$ . Such spectra have been observed by ``trap loss'' (decrease in atomic fluorescence), molecular ionization, and fragment ionization. Optical-optical double resonance (OODR), e.g. through the ``Franck-Condon windows'' of the ``pure long-range'' states, produces readily assignable spectra at higher asymptotes as well. Further extensions of ultracold photoassociative spectroscopy and applications to determination of long range potentials, atomic properties, and Bose-Einstein condensate stability will be presented.The field of laser cooling and trapping of atoms has had a profound impact on many areas of atomic, molecular and optical science. In particular, ultracold atoms colliding in magneto-optical traps typically have relative kinetic energies of $300\\mu K (\\sim 7 MHz)$, so free-bound absorption lines are as sharp as bound-bound lines. Moreover, because of very long range centrifugal barriers, only a few collisional partial waves are important ($J^{\\prime\\prime} = 0, 1$ and 2 in our work on $^{39}K$). Such photoassociative free-bound absorption allows observation of ``pure long-range molecule'' states ($R_{e} = 28$ and 39 {\\AA} in $^{39}K_{2}$) as well as long-range levels of known short range states with outer classical turning points of $\\sim 20 - 250 {\\AA}$. Such spectra have been observed by ``trap loss'' (decrease in atomic fluorescence), molecular ionization, and fragment ionization. Optical-optical double resonance (OODR), e.g. through the ``Franck-Condon windows'' of the ``pure long-range'' states, produces readily assignable spectra at higher asymptotes as well. Further extensions of ultracold photoassociative spectroscopy and applications to determination of long range potentials, atomic properties, and Bose-Einstein condensate stability will be presented.

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Optical frequency standard with ultra-cold strontium atoms

N. Poli, Robert E. Drullinger, Marco G. Tarallo +2 more

We report on our progress toward the realization of an optical frequency standard referenced to strontium intercombination lines. While first frequency measurement of the weakly allowed 1S 0- 3P 1 transition was done with saturation spectroscopy on a thermal beam, we are preparing the experimental setup for high resolution spectroscopy on ultracold atoms of the doubly forbidden 1S 0- 3P 0 line. Our current setup allows the capture more than 10 7 atoms at 1 μK in 500 ms in two stages of magneto-optical trapping. We also demonstrated the dipole trapping of ultracold strontium isotopes for accurate spectroscopy and collisional measurements. A semiconductor laser source at 698 nm has already been locked to a pre-stabilization cavity obtaining a fast linewidth of less than 1 kHz. Second stage stabilization of the clock laser to ultra-high finesse cavity is in development. Recent measurement of elastic and inelastic cross-sections of the two most abundant 88Sr and 86Sr isotopes are also presented.We report on our progress toward the realization of an optical frequency standard referenced to strontium intercombination lines. While first frequency measurement of the weakly allowed 1S 0- 3P 1 transition was done with saturation spectroscopy on a thermal beam, we are preparing the experimental setup for high resolution spectroscopy on ultracold atoms of the doubly forbidden 1S 0- 3P 0 line. Our current setup allows the capture more than 10 7 atoms at 1 μK in 500 ms in two stages of magneto-optical trapping. We also demonstrated the dipole trapping of ultracold strontium isotopes for accurate spectroscopy and collisional measurements. A semiconductor laser source at 698 nm has already been locked to a pre-stabilization cavity obtaining a fast linewidth of less than 1 kHz. Second stage stabilization of the clock laser to ultra-high finesse cavity is in development. Recent measurement of elastic and inelastic cross-sections of the two most abundant 88Sr and 86Sr isotopes are also presented.

Jan 1, 20062 citations

Theoretical analysis of the photoassociative spectroscopy of ultracold strontium atoms

Philippe Pellegrini, Robin C ot 'e, T. C. Killian

Bulletin of the American Physical SocietyMay 20, 20050 citations

Photoassociative spectroscopy at long range in ultracold strontium

Pascal G. Mickelson, Sarah Nagel, A. D. Saenz +4 more

Bulletin of the American Physical SocietyMay 20, 20050 citations

We report the use of photoassociative spectroscopy to determine the ground-state

s

-wave scattering lengths for the main bosonic isotopes of strontium,

^{86}\mathrm{Sr}

and

^{88}\mathrm{Sr}

. Photoassociative transitions are driven with a laser red detuned by up to 1400 GHz from the $^{1}S_{0}\mathrm{\text{\ensuremath{-}}}^{1}P_{1}$ atomic resonance at 461 nm. A minimum in the transition amplitude for

^{86}\mathrm{Sr}

at $\ensuremath{-}494\ifmmode\pm\else\textpm\fi{}5\text{ }\text{ }\mathrm{GHz}$ allows us to determine the scattering lengths

610{a}_{0}<{a}_{86}<2300{a}_{0}

for

^{86}\mathrm{Sr}

and a much smaller value of $\ensuremath{-}1{a}_{0}<{a}_{88}<13{a}_{0}$ for

^{88}\mathrm{Sr}

We report photoassociative spectroscopy of

{^{88}\mathrm{S}\mathrm{r}}_{2}

in a magneto-optical trap operating on the $^{1}S_{0}\ensuremath{\rightarrow}^{3}P_{1}$ intercombination line at 689 nm. Photoassociative transitions are driven with a laser red detuned by 600--2400 MHz from the $^{1}S_{0}\ensuremath{\rightarrow}^{1}P_{1}$ atomic resonance at 461 nm. Photoassociation takes place at extremely large internuclear separation, and the photoassociative spectrum is strongly affected by relativistic retardation. A fit of the transition frequencies determines the

^{1}P_{1}

atomic lifetime ($\ensuremath{\tau}=5.22\ifmmode\pm\else\textpm\fi{}0.03\text{ }\text{ }\mathrm{n}\mathrm{s}$) and resolves a discrepancy between experiment and recent theoretical calculations.

300\\mu K (\\sim 7 MHz)

, so free-bound absorption lines are as sharp as bound-bound lines. Moreover, because of very long range centrifugal barriers, only a few collisional partial waves are important (

J^{\\prime\\prime} = 0, 1

and 2 in our work on

^{39}K

). Such photoassociative free-bound absorption allows observation of ``pure long-range molecule'' states (

R_{e} = 28

and 39 {\\AA} in

^{39}K_{2}

) as well as long-range levels of known short range states with outer classical turning points of

\\sim 20 - 250 {\\AA}

. Such spectra have been observed by ``trap loss'' (decrease in atomic fluorescence), molecular ionization, and fragment ionization. Optical-optical double resonance (OODR), e.g. through the ``Franck-Condon windows'' of the ``pure long-range'' states, produces readily assignable spectra at higher asymptotes as well. Further extensions of ultracold photoassociative spectroscopy and applications to determination of long range potentials, atomic properties, and Bose-Einstein condensate stability will be presented.