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

## TL;DR

This paper demonstrates a broadband cavity enhanced absorption spectroscopy technique in the mid-infrared using an all-fiber supercontinuum source, enabling sensitive multi-gas detection with sub-ppm accuracy.

## Contribution

It introduces a novel all-fiber supercontinuum source for cavity enhanced absorption spectroscopy in the mid-infrared, achieving high sensitivity and multi-gas detection.

## Key findings

- Successful detection of acetylene and methane with sub-ppm accuracy
- Linear response to gas concentrations confirming sensing feasibility
- Broadband operation from 3000 to 3450 nm

## Abstract

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