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文章研究了利用双光子受激拉曼绝热暗通道技术实现超冷原子向异核三原子分子转化过程中,可控外场参量(包括拉比脉冲的强度,脉宽以及单光子失谐等)对系统绝热性和转化效率的影响. 结果发现,系统的转化效率随斯托克斯光强度的增大先减小,后振荡,最终趋于小于1的稳定值,而随抽运光强的增大先增大,然后很快趋于1,表明抽运光和斯托克斯光对超冷分子的形成具有不同的作用. 脉冲宽度既能决定最终转化效率的大小,也能反映达到稳定转化所需的时间. 单光子失谐为红失谐时,系统有比较高的稳定转化效率,而蓝失谐光脉冲则不利于超冷分子的形成. 另外,还讨论了超冷异核三原子分子转化系统在经历不同反应通道时绝热性和转化效率的差别.We investigate the effects of external field parameters, including the strength of Rabi pulse, its width, and single-photon detuning, on conversion from ultracold atoms to heteronuclear triatomic molecules by two-photon stimulated Raman adiabatic passage. It is found that the conversion efficiency of the system decreases first with the strength of the Stokes pulse increasing, then oscillates, and finally approaches a stable value, which is less than 1. But for the pump pulse, the efficiency first increases with the increase of the pulse intensity, and then approaches 1 quickly. The results show that the two pulses play different roles in the conversion. The pulse width can not only determine the final conversion efficiency, but also be used to reflect the time needed for stable conversion. The system has a higher efficiency of conversion for red detuning pump laser, but the blue detuning is not conducive to the formation of the molecules. In addition, the differences of the adiabaticity and conversion efficiency among different reaction pathways are discussed.
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Keywords:
- heteronuclear triatomic molecule /
- stimulated Raman adiabatic passage /
- adiabatic parameter /
- adiabatic fidelity
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[1] Chin C, Flambaum V V, Kozlov M G 2009 New J. Phys. 11 055048
[2] Carr L D, DeMille D, Krems R V, Ye J 2009 New J. Phys. 11 055049
[3] Köhler T, Góral K, Julienne P 2006 Rev. Mod. Phys. 78 1311
[4] Jones K M, Tiesinga E, Lett P D, Julienne P 2006 Rev. Mod. Phys. 78 483
[5] Chin C, Grimm R, Julienne P, Tiesinga E 2010 Rev. Mod. Phys. 82 1225
[6] Mackie M, Kowalski R, Javanainen J 2000 Phys. Rev. Lett. 84 3803
[7] Mackie M 2002 Phys. Rev. A 66 043613
[8] Drummond P D, Kheruntsyan K V, Heinzen D J, Wynar R H 2002 Phys. Rev. A 65 063619
[9] Mackie M, Härkönen K, Collin A, Suominen K A, Javanainen J 2004 Phys. Rev. A 70 013614
[10] Meng S Y, Liu J 2010 Prog. Phys. 30 280 (in Chinese) [孟少英、刘 杰 2010 物理学进展 30 280]
[11] Bergmann K, Theuer H, Shore B W 1998 Rev. Mod. Phys. 70 1003
[12] Xie M, Ling L, Yang G J 2005 Acta Phys. Sin. 54 3616 (in Chinese) [谢 旻、凌 琳、杨国建 2005 54 3616]
[13] Winkler K, Thalhammer G, Theis M, Ritsch H, Grimm R,Denschlag J H 2005 Phys. Rev. Lett. 95 063202
[14] Sage J M, Sainis S, Bergeman T, DeMille D 2005 Phys. Rev. Lett. 94 203001
[15] Winkler K, Lang F, Thalhammer G, Straten P V, Grimm R, Denschlag J H 2007 Phys. Rev. Lett. 98 043201
[16] Ni K K, Ospelkaus S, de Miranda M H G, Peer A, Neyenhuis B, Zirbel J J, Kotochigova S, Julienne P S, Jin D S, Ye J 2008 Science 322 231
[17] Ospelkaus S, Ni K K, Quéméner G, Neyenhuis B, Wang D, de Miranda M H G, Bohn J L, Ye J, Jin D S 2010 Phys. Rev. Lett. 104 030402
[18] Aikawa K, Akamatsu D, Hayashi M, Oasa K, Kobayashi J, Naidon P, Kishimoto T, Ueda M, Inouye S 2010 Phys. Rev. Lett. 105 203001
[19] Pu H, Maenner P, Zhang W, Ling H Y 2007 Phys. Rev. Lett. 98 050406
[20] Ling H Y, Maenner P, Zhang W, Pu H 2007 Phys. Rev. A 75 033615
[21] Jing H, Zheng F, Jiang Y, Geng Z 2008 Phys. Rev. A 78 033617
[22] Meng S Y, Fu L B, Liu J 2008 Phys. Rev. A 78 053410
[23] Meng S Y, Fu L B, Chen J, Liu J 2009 Phys. Rev. A 79 063415
[24] Jing H, Cheng J, Meystre P 2008 Phys. Rev. A 77 043614
[25] Geng Z D, Jia N, Zhao X, Xia T Y, Jing H 2010 Chin. Phys. Lett. 27 030303
[26] Sun X P, Feng Z F,Li W D, Jia S T 2007 Acta Phys.Sin. 56 5727 (in Chinese) [孙晓鹏、冯志芳、李卫东、贾锁堂 2007 56 5727]
[27] Gupta M, Dastidar K R 2010 Phys. Rev. A 81 033610
[28] Meng S Y, Wu W 2009 Acta Phys. Sin. 58 5311 (in Chinese) [孟少英、吴 炜 2009 58 5311]
[29] Meng S Y, Wu W,Liu B 2009 Acta Phys. Sin. 58 6902 (in Chinese) [孟少英、吴 炜、刘 彬 2009 58 6902]
[30] Lu L H, Li Y Q 2008 Phys. Rev. A 77 053611
[31] Meng S Y, Wu W, Liu B, Ye D F, Fu L B 2009 Chin. Phys. B 18 3844
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