Zeeman slowing atoms using the magnetic field from a magneto-optical trap

Wen Yan; Yuan Yao; Yuxin Sun; Hoyt W. Chad; Yanyi Jiang; Longsheng Ma

doi:10.3788/COL201917.040201

Journals >Chinese Optics Letters >Volume 17 >Issue 4 >Page 040201 > Article

Chinese Optics Letters
Vol. 17, Issue 4, 040201 (2019)

Zeeman slowing atoms using the magnetic field from a magneto-optical trap | Editors' Pick

Wen Yan¹, Yuan Yao^1、*, Yuxin Sun¹, Hoyt W. Chad², Yanyi Jiang¹, and Longsheng Ma¹

Author Affiliations

¹State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, China

²Physics & Engineering, Bethel University, St. Paul, Minnesota 55112, USA

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DOI: 10.3788/COL201917.040201 Cite this Article Set citation alerts

Wen Yan, Yuan Yao, Yuxin Sun, Hoyt W. Chad, Yanyi Jiang, Longsheng Ma. Zeeman slowing atoms using the magnetic field from a magneto-optical trap[J]. Chinese Optics Letters, 2019, 17(4): 040201 Copy Citation Text

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Abstract

We study a Zeeman slower using the magnetic field generated by a pair of coils for a magneto-optical trap. The efficiency of the Zeeman slower is shown to be dependent on the intensity and frequency detuning of the laser light for slowing the atoms. With the help of numerical analysis, optimal experimental parameters are explored. Experimentally, the optimal frequency detuning and intensity of the slowing beam are explored, and 4 × 10⁷ ytterbium atoms are trapped in the magneto-optical trap.

\vec{B} (z) = \frac{μ_{0} I}{2 π z} \frac{- A}{\sqrt{{(R_{c} + z)}^{2} + A^{2}}} \times [- K (k^{2})] + \frac{R_{c}^{2} + z^{2} + A^{2}}{{(R_{c} - z)}^{2} + A^{2}} E (k^{2}),

(1)

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δ = \vec{k} \cdot \vec{v} + Δ + \frac{\vec{μ} \cdot \vec{B} (z)}{ℏ},

(2)

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\vec{F} = - ℏ \vec{k} \frac{Γ}{2} \frac{s}{1 + s + {(2 δ / Γ)}^{2}} .

(3)

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f (v) = \frac{v^{3}}{2 {\overset{ˇ}{v}}^{4}} \exp (- \frac{v^{2}}{2 {\overset{ˇ}{v}}^{2}}),

(4)

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v_{c} = \frac{8 d ℏ k^{2}}{3 m} \frac{I_{trap}}{I_{s}} \frac{Δ_{T}}{Γ} {(1 + \frac{I_{trap}}{I_{s}} + 4 \frac{Δ_{T}^{2}}{Γ^{2}})}^{- 2},

(5)

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n_{o} = \frac{2 N_{A} π r^{3}}{3} \sqrt{\frac{8 R T}{π M}} \frac{Δ P}{l R T},

(6)

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j = \frac{n_{o}}{π W},

(7)

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N (t) = R_{c} τ [1 - \exp (- \frac{t}{τ})],

(8)

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Wen Yan, Yuan Yao, Yuxin Sun, Hoyt W. Chad, Yanyi Jiang, Longsheng Ma. Zeeman slowing atoms using the magnetic field from a magneto-optical trap[J]. Chinese Optics Letters, 2019, 17(4): 040201

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