Improvement of SNR of NaCs Molecular PA Spectra

WANG Wenhao; WU Jizhou; MA Jie; XIAO Liantuan; JIA Suotang

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Improvement of SNR of NaCs Molecular PA Spectra

WANG Wenhao,WU Jizhou *,MA Jie,XIAO Liantuan,JIA Suotang

State Key Laboratory of Quantum Optics and Quantum Optics Devices, Institute of Laser Spectroscopy, College of Physics and Electronics Engineering, Shanxi University

*Correspondence author

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Funding: Specialized Research Fund for the Doctoral Program of Higher Education of China （No.20131401120012）

Opened online:31 May 2017

Accepted by: none

Citation: WANG Wenhao,WU Jizhou,MA Jie.Improvement of SNR of NaCs Molecular PA Spectra[OL]. [31 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4735827

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 found 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 PA laser with the colliding Na-Cs atom pairs on the SNR of PA spectra. The dynamical process of 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:Atomic and molecular physics; photoassociation spectra; high-sensitively detecting; signal-to-noise ratio

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