Optimization of a magneto-optic trap using nanofibers

doi:10.1088/1674-1056/28/7/073701

Abstract

We experimentally demonstrate a reliable method based on a nanofiber to optimize the number of cold atoms in a magneto-optical trap (MOT) and to monitor the MOT in real time. The atomic fluorescence is collected by a nanofiber with subwavelength diameter of about 400 nm. The MOT parameters are experimentally adjusted in order to match the maximum number of cold atoms provided by the fluorescence collected by the nanofiber. The maximum number of cold atoms is obtained when the intensities of the cooling and re-pumping beams are about 23.5 mW/cm² and 7.1 mW/cm², respectively; the detuning of the cooling beam is -13.0 MHz, and the axial magnetic gradient is about 9.7 Gauss/cm. We observe a maximum photon counting rate of nearly (4.5±0.1)×10⁵ counts/s. The nanofiber-atom system can provide a powerful and flexible tool for sensitive atom detection and for monitoring atom-matter coupling. It can be widely used from quantum optics to quantum precision measurement.

Keywords: nanofiber magneto-optic trap optimization fluorescence efficient coupling

Received: 28 February 2019
Revised: 07 May 2019
Accepted manuscript online:

PACS:	37.10.-x	(Atom, molecule, and ion cooling methods)
	42.81.Qb	(Fiber waveguides, couplers, and arrays)
	32.50.+d	(Fluorescence, phosphorescence (including quenching))
	42.50.-p	(Quantum optics)

Fund:

Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0304502), the National Natural Science Foundation of China (Grant Nos. 11574187, 11634008, 11674203, and 61227902), and the Fund for Shanxi “1331 Project”, China.

Corresponding Authors: Peng-Fei Zhang, Tian-Cai Zhang
E-mail: cqedpfzhang@163.com;tczhang@sxu.edu.cn

Cite this article:

Xin Wang(王鑫), Li-Jun Song(宋丽军), Chen-Xi Wang(王晨曦), Peng-Fei Zhang(张鹏飞), Gang Li(李刚), Tian-Cai Zhang(张天才) Optimization of a magneto-optic trap using nanofibers 2019 Chin. Phys. B 28 073701

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