Cavity enhanced absorption spectroscopy in the mid-infrared using a supercontinuum source

摘要

We demonstrate incoherent broadband cavity enhanced absorption spectroscopyin the mid-infrared wave- length range from 3000 to 3450 nm using an all-fiberbased supercontinuum source. Multi-components gas detection is performed andconcentrations of acetylene and methane are retrieved with sub-ppm accuracy. Alinear response to nominal gas concentrations is observed demonstrating thefeasibility of the method for sensing applications.