title: Compact multipass optical cell for laser spectroscopy.
abstract: A multipass cell (MPC) design for laser absorption spectroscopy is presented. The development of this new type of optical cell was driven by stringent criteria for compactness, robustness, low volume, and ease of use in optical systems. A single piece of reflective toroidal surface forms a near-concentric cavity with a volume of merely 40 cm(3). Contrary to traditional MPCs, this design allows for flexible path-length adjustments by simply changing the aiming angle of the laser beam at the entrance window. Two effective optical path lengths of 2.2 and 4.1 m were chosen to demonstrate the cell's suitability for high-precision isotope ratio measurements of CO(2) at 1% and ambient mixing ratio levels.
authors: Empa, Swiss Federal Laboratories for Materials Science and Technology, Dübendorf, Switzerland. bela.tuzson@empa.ch
authors: Béla
authors: B
authors: Tuzson
authors: Markus
authors: M
authors: Mangold
authors: Herbert
authors: H
authors: Looser
authors: Albert
authors: A
authors: Manninen
authors: Lukas
authors: L
authors: Emmenegger