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) Signal of 5-ppmv H₂S with background signal, and (b) signal of 5-ppmv H₂S after removing background signal.