Cold Atom Cloud with High Optical Depth Measured with Large Duty Cycle
ZHANG Jun, GU Zhen-Jie, QIAN Peng, HAN Zhi-Guang, CHEN Jie-Fei**
Department of Physics, East China Normal University, Shanghai 200062
Abstract ：We present a cold atom system with a dark-line two-dimensional magneto-optical trap, to increase the atomic density by suppressing the atomic radiation pressure. Optical depth (OD) and duty cycle are used to evaluate the system performance. We demonstrate a 100% increase in OD with the dark line, and obtain an ultrahigh OD of 264 with 10% for the duty cycle. Also, with an efficient dark line region, the OD could maintain above 100 with duty cycle as high as 30%. The cold atomic ensemble with an ultrahigh OD with a 10%–30% duty cycle is particularly advantageous in quantum information processing and communication.
收稿日期: 2015-03-24
出版日期: 2015-06-30
:
42.25.Bs
(Wave propagation, transmission and absorption)
42.50.Gy
(Effects of atomic coherence on propagation, absorption, and Amplification of light; electromagnetically induced transparency and Absorption)
32.80.Qk
(Coherent control of atomic interactions with photons)
[1] Phillips W D 1998 Rev. Mod. Phys. 70 721 Laser Cooling Trapping (New York: Springer) chap 11 p 1562007 Phys. Rev. Lett. 98 123601 2002 Phys. Rev. Lett. 88 067901 2006 Phys. Rev. Lett. 96 043603 2005 Phys. Rev. A 71 023404 Acta Phys. Sin. 57 6227 (in Chinese)Acta Phys. Sin. 63 153701 (in Chinese)Acta Phys. Sin. 61 170601 (in Chinese)1987 Phys. Rev. Lett. 59 2631 2011 Chin. Phys. Lett. 28 033201 2009 Chin. Phys. Lett. 26 093202 2009 Chin. Phys. Lett. 26 083702 2007 Phys. Rev. A 75 033814 2012 Phys. Rev. Lett. 108 173603 2014 Phys. Rev. A 90 055401 2005 Opt. Express 13 9672 1994 J. Opt. Soc. Am. B 11 1332 2000 Opt. Commun. 180 73 2013 J. Phys.: Conf. Ser. 467 012009 1993 Phys. Rev. Lett. 70 2253 2010 Nat. Phys. 6 894 2013 Phys. Rev. A 88 043409 1999 Rev. Mod. Phys. 71 1 1990 Phys. Rev. Lett. 64 408 2012 Rev. Sci. Instrum. 83 073102 2008 Opt. Express 16 3753 2009 Chin. Phys. Lett. 26 023201 2009 Phys. Rev. Lett. 103 093602 2011 Chin. Phys. B 20 123701
[1]
.
[2]
.
[3]
.
[4]
.
[5]
.
[6]
.
[7]
.
[8]
.
[9]
.
[10]
.
[11]
.
[12]
.
[13]
.
[14]
.
[15]
.
2015, Vol. 32 
