A Compact, Cylindrical Multi-pass Cell for Sensitive Detection of Gas Absorption

We developed a compact trace gas sensor, which incorporates a cylindrical thin-disk multi-pass cell. This cell is useful because the optical path length can be selected easily in a small absorption volume across the beam path of 25 cm3. We studied the optical characteristics of this cell and demonstrated some gas measurements with this system. This paper discusses the performance of the gas detection system which incorporates a cylindrical cell.