Sensitive detection of methane via absorption spectroscopy using a mid-infrared DFB interband cascade laser

摘要

We have demonstrated sensitive detection of methane using an absorption spectrometer based on a mid-infrared DFB Interband Cascade laser at 3.47 microns. Using balanced ratiometric detection, we demonstrated a minimum measurable peak absorption of 4 x 10~(-4) for the line at 2878.362 cm~(-1).