Suppression of the etalon fringe in absorption spectrometry with an infrared tunable diode laser

Naoki Kagawa; Osami Wada; Ryuji Koga

doi:10.1117/1.601485

1 September 1997 Suppression of the etalon fringe in absorption spectrometry with an infrared tunable diode laser

Naoki Kagawa, Osami Wada, Ryuji Koga

Optical Engineering, Vol. 36, Issue 9, (September 1997). https://doi.org/10.1117/1.601485

A polarization control method is applied to suppress the e´ talon fringe, and experimental results are described. It is found that this method can suppress an e´ talon fringe of the order of 102-6 in terms of the equivalent absolute absorption value, 1/100 of the off-controlled condition. This technique enables our tunable diode laser absorption spectrometry (TDLAS) system to measure atmospheric methane of about 2 ppmv concentration with ambiguity within 102-4 ppmv (0.1 ppbv). This scheme is useful for the portable TDLAS systems because of its simplicity.

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Naoki Kagawa, Osami Wada, and Ryuji Koga "Suppression of the etalon fringe in absorption spectrometry with an infrared tunable diode laser," Optical Engineering 36(9), (1 September 1997). https://doi.org/10.1117/1.601485

Published: 1 September 1997

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