title: Near-confocal cavity-enhanced Raman spectroscopy for multitrace-gas detection.
abstract: Simultaneous detection of multitrace gas is still a challenge. Near-confocal cavity-enhanced Raman spectroscopy is proposed and demonstrated for simultaneous detection of multitrace gas. With a 200 mW incident laser, the excitation power of >9 W forms at two foci of the near-confocal cavity owing to the beam being reflected 50 times. High-power excitation light greatly enhances the detection sensitivity of the Raman system. Using this cavity-enhancing technique, high-sensitivity detection of the mixture of eight gases with same volume ratio has been achieved. This technique may be applied for detecting multitrace gas in many areas.
authors.affiliation: Department of Physics, Shanghai Jiao Tong University, Shanghai, China.
authors.forename: Xiaoyun
authors.initials: X
authors.lastname: Li
authors.forename: Yuxing
authors.initials: Y
authors.lastname: Xia
authors.forename: Li
authors.initials: L
authors.lastname: Zhan
authors.forename: Juming
authors.initials: J
authors.lastname: Huang