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Ultra-sensitive mid-infrared cavity leak-out spectroscopy using a cw optical parametric oscillator |
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| Authors: | A Popp F Müller F Kühnemann S Schiller G von Basum H Dahnke P Hering M Mürtz |
| Institution: | Institut für Angewandte Physik, Universit?t Bonn, Wegelerstrasse 8, 53115 Bonn, Germany, DE Institut für Experimentalphysik, Universit?t Düsseldorf, Universit?tsstrasse 1, 40225 Düsseldorf, Germany, DE Institut für Lasermedizin, Universit?t Düsseldorf, Universit?tsstrasse 1, 40225 Düsseldorf, Germany, DE |
| Abstract: | We report a portable, all-solid-state, mid-infrared spectrometer for trace-gas analysis. The light source is a continuous-wave optical parametric oscillator based on PPLN and pumped by a Nd:YAG laser at 1064 nm. The generated single-frequency idler output covers the wavelength region between 2.35 and 3.75 μm. With its narrow line width, this light source is suitable for precise trace-gas analysis with very high sensitivity. Using cavity leak-out spectroscopy we achieved a minimum detectable absorption coefficient of 1.2×10-9 /cm (integration time: 16 s), corresponding, for example, to a detection limit of 300 parts per trillion ethane. This sensitivity and the compact design make this trace-gas analyzer a promising tool for various in situ environmental and medical applications. Received: 19 September 2002 / Published online: 15 November 2002 RID="*" ID="*"Corresponding author. Fax: +49-228/733-474, E-mail: frank.kuehnemann@iap.uni-bonn.de |
| Keywords: | PACS: 42 55 Lt 42 62 Be 82 80 Gk 33 20 Ea |
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