Enhancement of signal-to-noise ratio of ultracold polar NaCs molecular spectra by phase locking detection

doi:10.1088/1674-1056/26/12/123701

Abstract

We report a method of high-sensitively detecting the weak signal in photoassociation (PA) spectra of ultracold NaCs molecules by phase sensitive-demodulated trap-loss spectra of Na atoms from a photomultiplier tube. We find that the signal-to-noise ratio (SNR) of the PA spectra is strongly dependent on the integration time and the sensitivity of the lock-in amplifier, and our results show reasonable agreement with the theoretical analyses of the SNR with the demodulation parameters. Meanwhile, we investigate the effect of the interaction time of the PA laser with the colliding Na-Cs atom pairs on the SNR of the PA spectra. The atom loss rate is dependent on both the PA-induced atom loss and the loading of the MOT. The high-sensitive detection of the excited ultracold NaCs molecules lays a solid foundation for further study of the formation and application of ultracold NaCs molecules.

Keywords: ultracold NaCs molecules photoassociation high-resolution spectroscopy signal-to-noise ratio

Received: 27 September 2017
Revised: 23 October 2017
Accepted manuscript online:

PACS:	37.10.Pq	(Trapping of molecules)
	33.15.Mt	(Rotation, vibration, and vibration-rotation constants)
	33.80.Wz	(Other multiphoton processes)

Fund:

Project supported by the National Key Research and Development Program of China (Grant No. 2017YFA0304203), the ChangJiang Scholars and Innovative Research Team in the University of the Ministry of Education of China (Grant No. IRT13076), the National Natural Science Foundation of China (Grant Nos. 91436108, 61378014, 61675121, 61705123, and 61722507), the Fund for Shanxi "1331 Project" Key Subjects Construction, China, and the Foundation for Outstanding Young Scholars of Shanxi Province, China (Grant No. 201601D021001).

Corresponding Authors: Jizhou Wu
E-mail: wujz@sxu.edu.cn

Cite this article:

Wenhao Wang(王文浩), Wenliang Liu(刘文良), Jizhou Wu(武寄洲), Yuqing Li(李玉清), Xiaofeng Wang(王晓锋), Yanyan Liu(刘艳艳), Jie Ma(马杰), Liantuan Xiao(肖连团), Suotang Jia(贾锁堂) Enhancement of signal-to-noise ratio of ultracold polar NaCs molecular spectra by phase locking detection 2017 Chin. Phys. B 26 123701

[1]	Ulmanis J, Deiglmayr J, Repp M, Wester R and Weidemuller M 2012 Chem. Rev. 112 4890
[2]	Jin D S and Ye J 2012 Chem. Rev. 112 4801
[3]	Aymar M and Dulieu O 2005 J. Chem. Phys. 122 204302
[4]	Ma J, Wu J Z, Zhao Y T, Xiao L T and Jia S T 2010 Opt. Express 18 17089
[5]	Ma J, Li Y Q, Liu W L, Chen P, Feng G S, Hu C Y, Wu J Z, Xiao L T and Jia S T 2014 Opt. Express 22 003754
[6]	Flambaum V V and Kozlov M G 2007 Phys. Rev. Lett. 99 150801
[7]	Isaev T A, Hoekstra S and Berger R 2005 Phys. Rev. A 82 052521
[8]	Hudson J J, Kara D M, Smallman I J, Sauer B E, Tarbutt M R and Hinds E A 2011 Nature 473 493
[9]	Santos L, Shlyapnikov G V, Zoller P and Lewenstein M 2000 Phys. Rev. Lett. 85 1791
[10]	Baranov M A, Dalmonte M, Pupillo G and Zoller P 2012 Chem. Rev. 112 5012
[11]	Haimberger C, Kleinert J, Bhattachary M and Bigelow N P 2004 Phys. Rev. A 70 021402(R)
[12]	DeMille D 2002 Phys. Rev. Lett. 88 067901
[13]	Ospelkaus S, Ni K K, Wang D J, de Miranda M H G, Neyenhuis B, Quéméner G, Julienne P S, Bohn J L, Jin D S and Ye J 2010 Sciene 327 853
[14]	Krems R V 2008 Phys. Chem. Chem. Phys. 10 4079
[15]	Ni K K, Ospelkaus S, de Miranda M H G, Peér A, Neyenhuis B, Zirbel J J, Kotochigova S, Julienne P S, Jin D S and Ye J 2008 Science 322 10
[16]	Molony P K, Gregory P D, Ji Z H, Lu B, Koppinger M P, Sueur R L, Blacjiey C L, Hutson J M and Cornish S L 2014 Phys. Rev. Lett. 113 255301
[17]	Guo M Y, Zhu B, Lu B, Ye X, Wang F D, Vexiau R, Bouloufa-Maafa N, Quéméner G and Dulieu O and Wang D J 2016 Phys. Rev. Lett. 116 205303
[18]	Park J W, Will S A and Zwierlein M W 2015 Phys. Rev. Lett. 114 205302
[19]	LeRoy R J and Bernstein R B 1970 J. Chem. Phys. 52 3869
[20]	Haimberger C, Kleinert J, Bhattacharya M and Bigelow N P 2004 Phys. Rev. A 70 021402
[21]	Zabawa P, Wakim A, Neukirch A, Haimberger C, Bigelow N P, Stolyarov A V, Pazyuk E A, Tamanis M and Ferber R 2010 Phys. Rev. A 82 040501(R)
[22]	Wakim A, Zabawa P and Bigelow N P 2011 Phys. Chem. Chem. Phys. 10 1039
[23]	Liu W L, Wu J Z, Ma J, Li P, Sovkov V B, Xiao L T and Jia S T 2016 Phys. Rev. A 94 032518
[24]	Ma J, Wu J Z, Chen G, Fan Q C, Feng H, Dai X C, Sun W G, Xiao L T and Jia S T 2013 J. Phys. Chem. Lett. 4 121
[25]	Ma J, Wang X F, Xin T Y, Liu W L, Li Y Q, Wu J Z, Xiao L T and Jia S T 2015 Acta Phys. Sin. 64 153303(in Chinese)
[26]	Chen P, Li Y Q, Zhang Y C, Wu J Z, Ma J, Xiao L T and Jia S T 2013 Chin. Phys. B 22 093301
[27]	Zhang Y C, Wu J Z, Li Y Q, Ma J, Wang L R, Zhao Y T, Xiao L T and Jia S T 2011 Chin. Phys. B 20 123701
[28]	Zhang Y C, Wu J Z, Ma J, Zhao Y T, Wang L R, Xiao L T and Jia S T 2010 Acta Phys. Sin. 59 5418(in Chinese)
[29]	Movre M and Beuc R 1985 Phys. Rev. A 31 2957
[30]	Junker M, Dries D, Welford C, Hitchcock J, Chen Y P and Hulet R G 2008 Phys. Rev. Lett. 101 060406
[31]	Zhang Y C, Ma J, Wu J Z, Wang L R, Xiao L T and Jia S 2013 Phys. Rev. A 87 030503
[32]	Xu R D, Liu W L, Wu J Z, Ma J, Xiao L T and Jia S T 2016 Acta Phys. Sin. 65 093201(in Chinese)

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Enhancement of signal-to-noise ratio of ultracold polar NaCs molecular spectra by phase locking detection

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