Annual Meeting Optical Society of America

Dark spontaneous-force optical trap

Wolfgang Ketterle, Kendall B. Davis, Michael A. Joffe, Alex Martin, David E. Pritchard

Published Jan 1, 1993• 0 citations

Abstract

We have demonstrated a new magneto-optical trap which confines atoms predominantly in a “dark” hyperfine level, that does not interact with the trapping light.

DOI: 10.1364/oam.1993.ml.1

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Annual Meeting Optical Society of America

Dark spontaneous-force optical trap

Wolfgang Ketterle, Kendall B. Davis, Michael A. Joffe, Alex Martin, David E. Pritchard

Published Jan 1, 1993• 0 citations

Publisher

Abstract

We have demonstrated a new magneto-optical trap which confines atoms predominantly in a “dark” hyperfine level, that does not interact with the trapping light.

DOI: 10.1364/oam.1993.ml.1

Related papers

High densities of cold atoms in a dark spontaneous-force optical trap

Wolfgang Ketterle, Kendall B. Davis, Michael A. Joffe +2 more

A new magneto-optical trap is demonstrated which confines atoms predominantly in a ``dark'' hyperfine level, that does not interact with the trapping light. This leads to much higher atomic densities as repulsive forces between atoms due to rescattered radiation are reduced and trap loss due to excited-state collisions is diminished. In such a trap, more than ${10}^{10}$ sodium atoms have been confined to densities approaching ${10}^{12}$ atoms ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$.A new magneto-optical trap is demonstrated which confines atoms predominantly in a ``dark'' hyperfine level, that does not interact with the trapping light. This leads to much higher atomic densities as repulsive forces between atoms due to rescattered radiation are reduced and trap loss due to excited-state collisions is diminished. In such a trap, more than ${10}^{10}$ sodium atoms have been confined to densities approaching ${10}^{12}$ atoms ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$.

Physical Review LettersApr 12, 1993528 citations

Creating a self-induced dark spontaneous-force optical trap for neutral atoms

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arXiv:physics/0402106Optics CommunicationsMar 6, 20048 citations

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H. Wang, P. L. Gould, William C. Stwalley

We have performed photoassociative spectroscopy of ultracold potassium atoms in a high-density vapor-cell magneto-optical trap (MOT) in which atoms are confined predominantly in "dark" hyperfine levels that do not interact with the trapping light. Three well-resolved vibrational series (one strong and two weak) of the $^{39}\mathrm{K}_{2}$ molecule are observed within 8 ${\mathrm{cm}}^{\ensuremath{-}1}$ below the $4^{2}P_{\frac{3}{2}}$ atomic limit. One of the series is identified as the ${0}_{g}^{\ensuremath{-}}$ pure long-range state and the other two are assigned to the ${0}_{u}^{+}$ and ${1}_{g}$ states. These photoassociative spectra are obtained by measuring reductions in the trap fluorescence due to trap loss induced by an intense photoassociation laser. By using a vapor-cell-dark MOT technique, we achieve atomic densities greater than ${10}^{11}$ ${\mathrm{cm}}^{\ensuremath{-}3}$, increasing our trap loss signals by an order of magnitude compared to a normal MOT.We have performed photoassociative spectroscopy of ultracold potassium atoms in a high-density vapor-cell magneto-optical trap (MOT) in which atoms are confined predominantly in "dark" hyperfine levels that do not interact with the trapping light. Three well-resolved vibrational series (one strong and two weak) of the $^{39}\mathrm{K}_{2}$ molecule are observed within 8 ${\mathrm{cm}}^{\ensuremath{-}1}$ below the $4^{2}P_{\frac{3}{2}}$ atomic limit. One of the series is identified as the ${0}_{g}^{\ensuremath{-}}$ pure long-range state and the other two are assigned to the ${0}_{u}^{+}$ and ${1}_{g}$ states. These photoassociative spectra are obtained by measuring reductions in the trap fluorescence due to trap loss induced by an intense photoassociation laser. By using a vapor-cell-dark MOT technique, we achieve atomic densities greater than ${10}^{11}$ ${\mathrm{cm}}^{\ensuremath{-}3}$, increasing our trap loss signals by an order of magnitude compared to a normal MOT.

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Cold-atom densities of more than 10 12 cm − 3 in a holographically shaped dark spontaneous-force optical trap

Neal Radwell, G. Walker, Sonja Franke‐Arnold

We demonstrate an atom trap geometry for ${}^{87}$ Rb which is capable of producing ultrahigh atom densities. Reradiation forces, which usually limit high densities, can be avoided in dark spontaneous-force optical traps (dark SPOTs) by sheltering atoms from intense trapping light. Here we demonstrate a dynamic implementation of a dark SPOT, resulting in an increase in atom density by almost two orders of magnitude up to $1.3\ifmmode\times\else\texttimes\fi{}{10}^{12}$ cm${}^{\ensuremath{-}3}$. Holographic control of the trapping beams and dynamic switching between magneto-optical trap (MOT) and dark SPOT configuration allows us to optimize the trapping geometry. We have identified the ideal size of the dark core to be six times larger than the MOT. Our method also avoids unwanted heating so that we reach a record phase-space density for a MOT.We demonstrate an atom trap geometry for ${}^{87}$Rb which is capable of producing ultrahigh atom densities. Reradiation forces, which usually limit high densities, can be avoided in dark spontaneous-force optical traps (dark SPOTs) by sheltering atoms from intense trapping light. Here we demonstrate a dynamic implementation of a dark SPOT, resulting in an increase in atom density by almost two orders of magnitude up to $1.3\ifmmode\times\else\texttimes\fi{}{10}^{12}$ cm${}^{\ensuremath{-}3}$. Holographic control of the trapping beams and dynamic switching between magneto-optical trap (MOT) and dark SPOT configuration allows us to optimize the trapping geometry. We have identified the ideal size of the dark core to be six times larger than the MOT. Our method also avoids unwanted heating so that we reach a record phase-space density for a MOT.

Physical Review AOct 8, 201332 citations

Spin-polarized optical atom trap

Thad G Walker, P. Feng, D. Hoffmann +1 more

We present our observations of a spontaneous-force atom trap in which the atoms are highly spin-polarized.

Annual Meeting Optical Society of AmericaJan 1, 19930 citations

{10}^{10}

sodium atoms have been confined to densities approaching

{10}^{12}

atoms ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$.

^{39}\mathrm{K}_{2}

molecule are observed within 8 ${\mathrm{cm}}^{\ensuremath{-}1}$ below the

4^{2}P_{\frac{3}{2}}

atomic limit. One of the series is identified as the ${0}_{g}^{\ensuremath{-}}$ pure long-range state and the other two are assigned to the

{0}_{u}^{+}

and

{1}_{g}

states. These photoassociative spectra are obtained by measuring reductions in the trap fluorescence due to trap loss induced by an intense photoassociation laser. By using a vapor-cell-dark MOT technique, we achieve atomic densities greater than

{10}^{11}

${\mathrm{cm}}^{\ensuremath{-}3}$, increasing our trap loss signals by an order of magnitude compared to a normal MOT.

We demonstrate an atom trap geometry for

{}^{87}

Rb which is capable of producing ultrahigh atom densities. Reradiation forces, which usually limit high densities, can be avoided in dark spontaneous-force optical traps (dark SPOTs) by sheltering atoms from intense trapping light. Here we demonstrate a dynamic implementation of a dark SPOT, resulting in an increase in atom density by almost two orders of magnitude up to $1.3\ifmmode\times\else\texttimes\fi{}{10}^{12}$ cm${}^{\ensuremath{-}3}$. Holographic control of the trapping beams and dynamic switching between magneto-optical trap (MOT) and dark SPOT configuration allows us to optimize the trapping geometry. We have identified the ideal size of the dark core to be six times larger than the MOT. Our method also avoids unwanted heating so that we reach a record phase-space density for a MOT.