title: Intracavity phase-matched coherent anti-Stokes Raman spectroscopy for trace gas detection.
abstract: We present a novel, cavity-enhanced spectroscopic technique based on a phase-matched Raman process to detect trace quantities of gas. The essence of this technique is the careful control of cavity dispersion to satisfy the phase-matching condition of coherent anti-Stokes Raman scattering (CARS) enhanced in a high-finesse optical cavity. A 6000-fold improvement of the CARS signal is observed under optimized conditions, indicating that this is a promising tool to quantify Raman-active molecules with an extremely low detection limit.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Kyushu University.
authors.forename: Shin-ichi
authors.initials: S
authors.lastname: Zaitsu
authors.forename: Totaro
authors.initials: T
authors.lastname: Imasaka