Photoacoustic spectroscopy with quantum cascade distributed-feedback lasers

被引：0
|
作者：
Hofstetter, Daniel [1 ]
Beck, Mattias [1 ]
Faist, Jérôme [1 ]
Nägele, Markus [2 ]
Sigrist, Markus W. [2 ]
机构：
[1] Institute of Physics, University of Neuchâtel, 1 A.-L. Breguet, CH-2000 Neuchâtel, Switzerland
[2] Institute of Quantum Electronics, Swiss Fed. Institute of Technology, CH-8093 Zürich, Switzerland
来源：
| 2001年 / Optical Society of America (OSA)卷 / 26期
关键词：
Microphones - Photoacoustic spectroscopy - Quantum optics;
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摘要：
We present photoacoustic (PA) spectroscopy measurements of carbon dioxide, methanol, and ammonia. The light source for the excitation was a single-mode quantum cascade distributed-feedback laser, which was operated in pulsed mode at moderate duty cycle and slightly below room temperature. Temperature tuning resulted in a typical wavelength range of 3 cm-1at a linewidth of 0.2 cm-1. The setup was based on a Herriott multipass arrangement around the PA cell; the cell was equipped with a radial 16-microphone array to increase sensitivity. Despite the relatively small average laser power, the ammonia detection limit was 300 parts in 109by volume. © 2001 Optical Society of America.
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