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Chinese Optics Letters

Maximized cooling efficiency for a Zeeman slower operating at optimized magnetic field profile

熊转贤 Zhuanxian Xiong, 龙云 Yun Long, 肖辉星 Huixing Xiao, 张曦 Xi Zhang, 贺凌翔 Lingxiang He, 吕宝龙 Baolong Lv

Published Jan 1, 2011• 0 citations
Publisher

Abstract

We build a Zeeman slower with consecutive coils and use it to load an Yb magneto-optical trap (MOTs).Cooling efficiency is measured by the fluorescence intensity of the atomic cloud trapped by the MOT.An optimized magnetic field profile can acquire the maximum cooling efficiency, corresponding to a good compromise between the smaller magnetic field mismatch and the high capture velocity.Our studies provide useful information on how the performance of the Zeeman slower can be improved.

DOI
10.3788/col20110901.010201

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We build a Zeeman slower with consecutive coils and use it to load an Yb magneto-optical trap (MOTs).Cooling efficiency is measured by the fluorescence intensity of the atomic cloud trapped by the MOT.An optimized magnetic field profile can acquire the maximum cooling efficiency, corresponding to a good compromise between the smaller magnetic field mismatch and the high capture velocity.Our studies provide useful information on how the performance of the Zeeman slower can be improved.
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Abstract An optimized design of a permanent Zeeman slower for an ytterbium optical lattice clock is presented. The dependences of the magnetic field distributions on the detuning and intensity of the cooling laser are studied. The length and corresponding magnetic field distribution of the slower are analyzed by varying the efficiency parameter and saturation parameter of the cooling laser. Considering the slowing efficiency and the loading rate of the magneto-optical trap, the optimum length of the slower is about 15 cm, and its width is about 10 cm in our case. Finally, an adjustable slower with a slowing efficiency of 15.5% is proposed.
Abstract We report a robust technique for laser frequency stabilisation that enables the reproducible loading of in excess of 10 9 Yb atoms from a Zeeman slower directly into a magneto-optical trap (MOT) operating on the 1 S 0 → 3 P 1 transition, without the need for a first stage MOT on the 1 S 0 → 1 P 1 transition. We use a simple atomic beam apparatus to generate narrow fluorescence signals on both the 399 nm 1 S 0 → 1 P 1 transition used for the Zeeman slower and the 556 nm 1 S 0 → 3 P 1 transition. We present in detail the methods for obtaining spectra with a high signal-to-noise ratio and demonstrate error signals suitable for robust frequency stabilisation. Finally we demonstrate the stability and precision of our technique through sensitive measurements of the gravitational sag of the Yb MOT as a function of the intensity of the laser cooling beams, which are in good agreement with theory. These results will be important for efficient loading of the atoms into an optical dipole trap.