Applications of Laser Spectroscopy to Highly Sensitive Analyses - Cavity Ring-Down Spectroscopy -

By: Masahiro Kawasaki*

28 February 2007


*Professor of Graduate School of Engineering, Kyoto University, Doctor of Science

Laser has been widely used for analysis of various molecules because laser has a variety of features from continuous-wave oscillation to ultra-short pulse. While introducing some examples of applications of lasers from vacuum-ultraviolet to near infrared region, Analysis techniques by laser-induced fluorescence (LIF) spectroscopy and photo-acoustic spectroscopy (PAS) with a pulsed dye laser are explained. Applications of cavity ring-down spectroscopy (CRDS) with a semiconductor laser are compared with LIF and PAS. Then, as an advanced analytical technique, fiber-CRDS with Bragg gratings and a gain-switch semiconductor laser is discussed. CRDS with an evanescent light device or an onboard waveguide is explained as future prospects.

(Same content in Japanese is in Readout No.32-Japanese edition-.)

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