Improved atom number with a dual color magneto–optical trap

doi:10.1088/1674-1056/21/4/043203

Abstract We demonstrate a novel dual color magneto-optical trap (MOT), which uses two sets of overlapping laser beams to cool and trap ⁸⁷Rb atoms. The volume of cold cloud in the dual color MOT is strongly dependent on the frequency difference of the laser beams and can be significantly larger than that in the normal MOT with single frequency MOT beams. Our experiment shows that the dual color MOT has the same loading rate as the normal MOT, but much longer loading time, leading to threefold increase in the number of trapped atoms. This indicates that the larger number is caused by reduced light induced loss. The dual color MOT is very useful in experiments where both high vacuum level and large atom number are required, such as single chamber quantum memory and Bose-Einstein condensation (BEC) experiments. Compared to the popular dark spontaneous-force optical trap (dark SPOT) technique, our approach is technically simpler and more suitable to low power laser systems.

Keywords: magneto-optical trap

Received: 26 February 2012
Revised: 26 February 2012
Accepted manuscript online:

PACS:	32.80.Qk	(Coherent control of atomic interactions with photons)
	32.80.Xx	(Level crossing and optical pumping)

Fund: Project supported by the National High-Tech Research Program of China (Grant No. 2006AA06Z104), the National Basic Research Program of China (Grant No. 2006CB921206), and the National Natural Science Foundation of China (Grant No. 10704086)

Corresponding Authors: Wang Ru-Quan, E-mail:ruquanwang@aphy.iphy.ac.cn
E-mail: ruquanwang@aphy.iphy.ac.cn

Cite this article:

Cao Qiang (曹强), Luo Xin-Yu (罗鑫宇), Gao Kui-Yi (高奎意), Wang Xiao-Rui (王晓锐), Chen Dong-Min (陈东敏), Wang Ru-Quan (王如泉) Improved atom number with a dual color magneto–optical trap 2012 Chin. Phys. B 21 043203

[1]	Raab E L, Prentiss M, Cable A, Chu S and Pritchard D E 1987 Phys. Rev. Lett. 59 2631
[2]	Monroe C, Swann W, Robinson H and Wieman C 1990 Phys. Rev. Lett. 65 1571
[3]	Kasevich M and Chu S 1991 Phys. Rev. Lett. 67 181
[4]	Anderson M H, Ensher J R, Matthews M R, Wieman C E and Cornell E A 1995 Science 269 198
[5]	Hu Z and Kimble H J 1994 Opt. Lett. 19 1888
[6]	Adams C S and Riis E 1997 Prog. Quantum Electron. 21 1
[7]	Prentiss M, Cable A, Bjorkholm J E, Chu S, Raab E L and Pritchard D E 1988 Opt. Lett. 13 452
[8]	Ketterle W, Davis K B, Joffer M A, Martin A and Pritchard D E 1993 Phys. Rev. Lett. 70 2253
[9]	Anderson M H, Petrich W, Ensher J R and Cornell E A 1994 Phys. Rev. A 50 3597
[10]	Townsend C G, Edwards N H, Zetie K P, Cooper C J, Rink J and Foot C J 1996 Phys. Rev. A 53 1702
[11]	Sinclair A G, Riis E and Snadden M J 1994 J. Opt. Soc. Am. B 11 2333
[12]	Pradhan S, Gaur S J, Manohar K G and Jagatap B N 2005 Phys. Rev. A 72 053407
[13]	Petrich W, Anderson M H, Ensher J R and Cornell E A 1994 J. Opt. Soc. Am. B 11 1332
[14]	Cohen-Tannoudji C 1992 Phys. Rep. 219 153
[15]	Gallagher A and Pritchard D E 1989 Phys. Rev. Lett. 63 957
[16]	Sesko D, Walker T, Monroe C, Gallagher A and Wieman C 1989 Phys. Rev. Lett. 63 961
[17]	Luo X Y, Cao Q, Wang X R, Gao K Y and Wang R Q 2012 in preparation

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