Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line

G D Bruce, E Haller, B Peaudecerf, D A Cotta, M Andia, S Wu, M Y H Johnson, B W Lovett, S Kuhr

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Gray molasses is a powerful tool for sub-Doppler laser cooling of atoms to low temperatures. For alkaline atoms, this technique is commonly implemented with cooling lasers which are blue-detuned from either the D1 or D2 line. Here we show that efficient gray molasses can be implemented on the D2 line of 40K with red-detuned lasers. We obtained temperatures of 48(2) µK, which enables direct loading of 9.2(3)x10^6 atoms from a magneto-optical trap into an optical dipole trap. We support our findings by a one-dimensional model and three-dimensional numerical simulations of the optical Bloch equations which qualitatively reproduce the experimentally observed cooling effects.
LanguageEnglish
Article number095002
Number of pages7
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume50
Issue number9
Early online date12 Apr 2017
DOIs
Publication statusPublished - 12 Apr 2017

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laser cooling
traps
atoms
dipoles
cooling
lasers
simulation
temperature

Keywords

  • gray molasses
  • laser cooling
  • ultracold atoms
  • atomic physics
  • sub-Doppler cooling

Cite this

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title = "Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line",
abstract = "Gray molasses is a powerful tool for sub-Doppler laser cooling of atoms to low temperatures. For alkaline atoms, this technique is commonly implemented with cooling lasers which are blue-detuned from either the D1 or D2 line. Here we show that efficient gray molasses can be implemented on the D2 line of 40K with red-detuned lasers. We obtained temperatures of 48(2) µK, which enables direct loading of 9.2(3)x10^6 atoms from a magneto-optical trap into an optical dipole trap. We support our findings by a one-dimensional model and three-dimensional numerical simulations of the optical Bloch equations which qualitatively reproduce the experimentally observed cooling effects.",
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Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line. / Bruce, G D; Haller, E; Peaudecerf, B; Cotta, D A; Andia, M; Wu, S; Johnson, M Y H; Lovett, B W; Kuhr, S.

In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 50, No. 9, 095002, 12.04.2017.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line

AU - Bruce, G D

AU - Haller, E

AU - Peaudecerf, B

AU - Cotta, D A

AU - Andia, M

AU - Wu, S

AU - Johnson, M Y H

AU - Lovett, B W

AU - Kuhr, S

PY - 2017/4/12

Y1 - 2017/4/12

N2 - Gray molasses is a powerful tool for sub-Doppler laser cooling of atoms to low temperatures. For alkaline atoms, this technique is commonly implemented with cooling lasers which are blue-detuned from either the D1 or D2 line. Here we show that efficient gray molasses can be implemented on the D2 line of 40K with red-detuned lasers. We obtained temperatures of 48(2) µK, which enables direct loading of 9.2(3)x10^6 atoms from a magneto-optical trap into an optical dipole trap. We support our findings by a one-dimensional model and three-dimensional numerical simulations of the optical Bloch equations which qualitatively reproduce the experimentally observed cooling effects.

AB - Gray molasses is a powerful tool for sub-Doppler laser cooling of atoms to low temperatures. For alkaline atoms, this technique is commonly implemented with cooling lasers which are blue-detuned from either the D1 or D2 line. Here we show that efficient gray molasses can be implemented on the D2 line of 40K with red-detuned lasers. We obtained temperatures of 48(2) µK, which enables direct loading of 9.2(3)x10^6 atoms from a magneto-optical trap into an optical dipole trap. We support our findings by a one-dimensional model and three-dimensional numerical simulations of the optical Bloch equations which qualitatively reproduce the experimentally observed cooling effects.

KW - gray molasses

KW - laser cooling

KW - ultracold atoms

KW - atomic physics

KW - sub-Doppler cooling

U2 - 10.1088/1361-6455/aa65ea

DO - 10.1088/1361-6455/aa65ea

M3 - Article

VL - 50

JO - Journal of Physics B: Atomic, Molecular and Optical Physics

T2 - Journal of Physics B: Atomic, Molecular and Optical Physics

JF - Journal of Physics B: Atomic, Molecular and Optical Physics

SN - 0953-4075

IS - 9

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ER -