Saturated absorption spectroscopy of buffergas-cooled Barium monofluoride molecules  

作　　者：Wenhao Bu Yuhe Zhang Qian Liang Tao Chen Bo Yan 

机构地区：[1]Interdisciplinary Center of Quantum Information,State Key Laboratory of Modern Optical Instrumentation,and Zhejiang Province Key Laboratory of Quantum Technology and Device of Physics Department,Zhejiang University,Hangzhou 310027,China

出　　处：《Frontiers of physics》2022年第6期185-191,共7页物理学前沿（英文版）

基　　金：support from the National Key Research and Development Program of China under Grant No.2018YFA0307200;the National Natural Science Foundation of China under Grant Nos.U21A20437 and 12074337;the Natural Science Foundation of Zhejiang Province under Grant No.LR21A040002;Zhejiang Province Plan for Science and technology No.2020C01019;the Fundamental Research Funds for the Central Universities under No.2021FZZX001-02.

摘　　要：We report an experimental investigation on the Doppler-free saturated absorption spectroscopy of buffer-gas-cooled Barium monofluoride(BaF)molecules in a 4 K cryogenic cell.The obtained spectra with a resolution of 19 MHz,much smaller than previously observed in absorption spectroscopy,clearly resolve the hyperfine transitions.Moreover,we use these high-resolution spectra to fit the hyperfine splittings of excited A(v=0)state and find the hyperfine splitting of the laser-cooling-relevant A^(2)Π_(1/2)(v=0,J=1/2,+)state is about 18 MHz,much higher than the previous theoretically predicted value.This provides important missing information for laser cooling of BaF molecules.

关 键 词：cold molecule saturated spectroscopy buffer gas cooling BAF 

分 类 号：O433[机械工程—光学工程]