Rapid and High-Sensitivity Measurements of O2 A-Band Absorption Spectra with Combination of a Current-Modulated Distributed-Feedback Diode Laser and Balance Detection
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概要
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We modulate the driving current of a distributed-feedback diode laser for the laser-light frequency to scan over the oxygen A-band (P11Q10, \nu = 392.3220 THz) at the scan repetition rate from 0.1 to 10 kHz. The scan range is over 40 GHz below 1 kHz, while it is 35.5 GHz at 10 kHz. Using a balanced photo-receiver, we measure the absorption spectra for an optical path length of 0.22 m in atmospheric air at 298 K. The minimum detectable absorbance is 3.6 \times 10^{-5} at 10 kHz for a single scan measurement, which is about 2 times as large as the shot noise limit. We also demonstrate the absorption measurement for an optical path length of 0.03 m, the size of which is comparable to a small reaction chamber such as a combustion engine.
- 2012-02-25
著者
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Hasuo Masahiro
Department Of Engineering Mechanics And Science Graduate School Of Engineering Kyoto University
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SHIKAMA Taiichi
Department of Mechanical Engineering and Science, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
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Hasuo Masahiro
Department of Engineering Physics and Mechanics, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
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Katayama Koichi
Department of Engineering Physics and Mechanics, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
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Shikama Taiichi
Department of Engineering Physics and Mechanics, Graduate School of Engineering, Kyoto University, Kyoto 606-8501, Japan
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