Qiu Yi-Geng, Fan Yuan-Yuan, Yan Bo-Xia, Wang Yan-Wei, Wu Yi-Hang, Han Zhe, Qi Yan, Lu Ping. Design and experiment of light field shaping system for three-dimensional extended light source used in photoacoustic spectrometerJ. Acta Physica Sinica, 2021, 70(20): 204201. DOI: 10.7498/aps.70.20210691