A Coin-Sized Oxygen Laser Sensor Based on Tunable Diode Laser Absorption Spectroscopy Combining a Toroidal Absorption Cell. - Minxia Mao; Ting Gong; Kangjie Yuan; Lin Li; Guqing Guo; Xiaocong Sun; Yali Tian; Xuanbing Qiu; Christa Fittschen; Chuanliang Li (Sensors, 2023)