Hydrogen sulphide detection using near-infrared diode laser and compact dense-pattern multipass cell

Tian Xing^{1, 2}, Cao Yuan^{1, 2}, Chen Jia-Jin¹, Liu Kun^{1, †}, Wang Gui-Shi¹, Gao Xiao-Ming¹

(a) Measured 2f waveforms for different H₂S concentrations at 100 Torr, and (b) 2f signal amplitude of H₂S and fitting curve as a function of H₂S concentration.