Performance of mid-infrared difference frequency spectrometer employing a periodically poled LiNbO3 for next generation environmental monitoring

Shigeru Yamaguchi; Koichi Wake; Jun-ichi Sato

Chinese Optics Letters, 2007, 5 (s1): 105, Published Online: Jul. 15, 2007

Performance of mid-infrared difference frequency spectrometer employing a periodically poled LiNbO3 for next generation environmental monitoring

论文大纲

Shigeru Yamaguchi ^*Koichi Wake Jun-ichi Sato

Author Affiliations

Department of Physics, School of Science, Tokai University, 1117 Kitakaname, Hiratsuka 259-1292, Japan

120.6200 Spectrometers and spectroscopic instrumentation 190.2620 Harmonic generation and mixing 280.3420 Laser sensors 300.6340 Spectroscopy, infrared

Abstract

Development of a fiber laser pumped, compact mid-infrared (IR) difference frequency spectrometer employing a periodically poled LiNbO3 (PPLN) for next generation environmental monitoring is presented. Previous spectroscopic experiments of various gas species, performance characteristics of pump and signal lasers and PPLN-based difference frequency generation (DFG) are reviewed. The DFG spectrometers developed in our facility were carefully calibrated with concentrations between a few ppm and 500 ppm, and demonstrated with an excellent linearity. Moreover, a ratio between measurement deviation and gas concentration was approximately +-1%, which could maintain in a long-term measurement operation (~1000 h). Rapid gas detection for N2O, CH4, CO2, NO2, and NH3 with a total measurement time of less than 10 s was achieved with interference completely free from absorption spectra of other gas species, resulting in minimum detectable concentration at sub ppm level. Also, real-time NO2 monitoring of an exhaust gas of a diesel engine is demonstrated, and a simultaneous dual gas detection concept by the DFG is introduced.

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Shigeru Yamaguchi, Koichi Wake, Jun-ichi Sato. Performance of mid-infrared difference frequency spectrometer employing a periodically poled LiNbO3 for next generation environmental monitoring[J]. Chinese Optics Letters, 2007, 5(s1): 105.

Performance of mid-infrared difference frequency spectrometer employing a periodically poled LiNbO3 for next generation environmental monitoring

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