Chin. Phys. Lett.  2014, Vol. 31 Issue (07): 073401    DOI: 10.1088/0256-307X/31/7/073401
ATOMIC AND MOLECULAR PHYSICS |
Temperature of the Remaining Cold Atoms after Two-Step Photoionization in an 87Rb Vapor Cell Magneto-Optical Trap
RUAN Ya-Ping1, JIA Feng-Dong1, LIU Long-Wei1, SUN Zhen1, HUANG Wei2, XUE Ping3, XU Xiang-Yuan3,4, DAI Xing-Can3, ZHONG Zhi-Ping1**
1School of Physics, University of Chinese Academy of Sciences, PO Box 4588, Beijing 100049
2Laboratory of Quantum Engineering and Quantum Materials, SPTE, South China Normal University, Guangzhou 510006
3State Key Laboratory for Low-Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084
4Department of Physics, Capital Normal University, Beijing 100037
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RUAN Ya-Ping, JIA Feng-Dong, LIU Long-Wei et al  2014 Chin. Phys. Lett. 31 073401
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Abstract The temperature of the remaining cold 87Rb atoms confined in a vapor cell magneto-optical trap after two-step photoionization has been measured. In the two-step photoionization process, the first excitation laser is served by the cooling laser and the second excitation laser is served by a continuous semiconductor laser with a wavelength of 450 nm. The results show that the temperature of the remaining cold atoms decreases as the intensity of the second excitation laser increases. Moreover, the relationship between the temperature T and number N of the remaining cold atoms generally follows a power law, while it deviates from the well-known T∝N1/3 and the power factor is smaller than 1/3. We propose that ion-atom collisions occurring during a photoionization process strongly influence the temperature scaling law in an optically dense magneto-optical trap in the presence of an ionization laser. In addition, the forced evaporative cooling due to the combined effect of the detuning of the first excitation laser and the two-step photoionization plays a role in cooling the remaining cold atoms and results in the dependence of the power factor on the detuning of the first excitation laser.
Published: 30 June 2014
PACS:  34.50.Cx (Elastic; ultracold collisions)  
  34.80.Dp (Atomic excitation and ionization)  
  34.90.+q (Other topics in atomic and molecular collision processes and interactions)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/31/7/073401       OR      https://cpl.iphy.ac.cn/Y2014/V31/I07/073401
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RUAN Ya-Ping
JIA Feng-Dong
LIU Long-Wei
SUN Zhen
HUANG Wei
XUE Ping
XU Xiang-Yuan
DAI Xing-Can
ZHONG Zhi-Ping
[1] Suominen K A 1996 J. Phys. B 29 5981
[2] Weiner J, Bagnato V S, Zilio S and Julienne P S 1999 Rev. Mod. Phys. 71 1
[3] Lee S, Ravi K and Rangwala S A 2013 Phys. Rev. A 87 052701
[4] Grier A T, Cetina M, Oru?evi? F and Vuleti? V 2009 Phys. Rev. Lett. 102 223201
[5] H?rter A, Krükow A, Brunner A, Schnitzler W, Schmid S and Denschlag J H 2012 Phys. Rev. Lett. 109 123201
[6] Hall F H J and Willitsch S 2012 Phys. Rev. Lett. 109 233202
[7] C?té R and Dalgarno A 2000 Phys. Rev. A 62 012709
[8] Gao B 2010 Phys. Rev. Lett. 104 213201
[9] Krych M, Skomorowski W, Pawo?owski F, Moszynski R and Idziaszek Z 2011 Phys. Rev. A 83 032723
[10] Killian T C, Pattard T, Pohl T and Rost J M 2007 Phys. Rep. 449 77
[11] Huang W, Ruan Y P, Jia F D, Zhong Y P, Liu L W, Dai X C, Xue P, Xu X Y and Zhong Z P 2012 Chin. Phys. Lett. 29 013201
[12] Chu S, Hollberg L, Bjorkholm J E, Cable A and Ashkin A 1985 Phys. Rev. Lett. 55 48
[13] Lowell J R, Northup T, Patterson B M, Takekoshi T and Knize R J 2002 Phys. Rev. A 66 062704
[14] Drewsen M, Laurent P, Nadir A, Santarelli G, Clairon A, Castin Y, Grison D and Salomon C 1994 Appl. Phys. B 59 283
[15] Cooper C J, Hillenbrand G, Rink J, Townsend C G, Zetie K and Foot C J 1994 Europhys. Lett. 28 397
[16] Grego S, Colla M, Fioretti A, Müller J H, Verkerk P and Arimondo E 1996 Opt. Commun. 132 519
[17] Vorozcovs A, Weel M, Beattie S, Cauchi S and Kumarakrishnan A 2005 J. Opt. Soc. Am. B 22 943
[18] Hillenbrand G, Foot C J and Burnett K 1994 Phys. Rev. A 50 1479
[19] Hillenbrand G, Burnett K and Foot C J 1995 Phys. Rev. A 52 4763
[20] McDaniel E W 1964 Collision Phenomena In Ionized Gases (John Wiley and Sons, Inc., New York)
[21] Smrinov B M 2003 Physics Of Atoms and Ions (Berlin: Springer-Verlag)
[22] Smirnov B M 2001 Phys. Usp. 44 221
[23] Ravi K, Lee S, Sharma A, Werth G and Rangwala S A 2012 Nat. Commun. 3 1126
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