Enhancement of signal-to-noise ratio of ultracold polar NaCs molecular spectra by phase locking detection<xref rid="cpb_26_12_123701_fn1" ref-type="fn">*</xref> <fn id="cpb_26_12_123701_fn1"> <label>*</label> <p>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).</p> </fn>

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

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).

Wang Wenhao¹, Liu Wenliang¹, Wu Jizhou^{1, 2, †}, Li Yuqing^{1, 2}, Wang Xiaofeng¹, Liu Yanyan¹, Ma Jie^{1, 2}, Xiao Liantuan^{1, 2}, Jia Suotang^{1, 2}

(color online) (a) Experimental setup. OI: optical isolator; H: half wave plate; PBS: polarization beam splitter; AOM: acousto–optic modulator; SAS: saturated absorption spectroscopy; M: high reflective mirror; L: lens; BPF: band pass filter; PMT: photomultiplier tube; MOT: magneto-optical trap; CCD: charge-coupled device. (b)Modulation principle diagram for the ultracold Na atom.