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

doi:10.1088/1361-6455/aa65ea

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

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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.

Original language	English
Article number	095002
Number of pages	7
Journal	Journal of Physics B: Atomic, Molecular and Optical Physics
Volume	50
Issue number	9
Early online date	12 Apr 2017
DOIs	https://doi.org/10.1088/1361-6455/aa65ea
Publication status	Published - 12 Apr 2017

Keywords

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

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10.1088/1361-6455/aa65eaLicence: CC BY 3.0

Bruce-etal-JOPB-2017-Sub-Doppler-laser-cooling-of-40KFinal published version, 625 KBLicence: CC BY 3.0

E Infrastructure Bid - Recurrent Costs Bid
Littlejohn, D. (Principal Investigator), Fedorov, M. (Co-investigator), Mulheran, P. (Co-investigator) & Reese, J. (Co-investigator)
EPSRC (Engineering and Physical Sciences Research Council)
1/04/12 → 31/03/13
Project: Research
E Infrastructure Bid - Capital Equipment Bid
Littlejohn, D. (Principal Investigator), Fedorov, M. (Co-investigator), Mulheran, P. (Co-investigator) & Reese, J. (Co-investigator)
EPSRC (Engineering and Physical Sciences Research Council)
20/01/12 → 31/03/12
Project: Research

Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line
Bruce, G. (Contributor), Haller, E. (Contributor), Peaudecerf, B. (Contributor), Cotta, D. (Contributor), Andia, M. (Contributor), Wu, S. (Contributor), Johnson, M. (Contributor), Lovett, B. (Contributor) & Kuhr, S. (Creator), University of Strathclyde, 20 Feb 2017
DOI: 10.15129/d638461d-9d68-43ff-b6e7-151d66fc7f2b
Dataset

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.",

keywords = "gray molasses, laser cooling, ultracold atoms, atomic physics, sub-Doppler cooling",

author = "Bruce, {G D} and E Haller and B Peaudecerf and Cotta, {D A} and M Andia and S Wu and Johnson, {M Y H} and Lovett, {B W} and S Kuhr",

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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

SN - 0953-4075

VL - 50

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

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

IS - 9

M1 - 095002

ER -

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

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

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