Differential noise-immune cavity-enhanced optical heterodyne molecular spectroscopy for improvement of the detection sensitivity by reduction of drifts from background signals

Gang Zhao; Thomas Hausmaninger; Weiguang Ma; Ove Axner

doi:10.1364/OE.25.029454

Differential noise-immune cavity-enhanced optical heterodyne molecular spectroscopy for improvement of the detection sensitivity by reduction of drifts from background signals

Gang Zhao, Thomas Hausmaninger, Weiguang Ma, Ove Axner

Not published at VTT

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5 Citations (Scopus)

Abstract

The detection sensitivity of noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) is often limited by background signals that bring in drifts. A novel realization of NICE-OHMS, termed differential NICE-OHMS, that both reduces such drifts and enlarges the molecular signal is presented. It is based on simultaneous detection of NICE-OHMS signals in reflection and transmission, followed by a subtraction of the former (properly weighted) from the latter. An Allan plot analysis shows that the instrumentation could demonstrate a noise equivalent absorption per unit length (NEAL) of 4.7 × 10⁻¹⁴ cm⁻¹, obtained for an integration time of 170 s.

Original language	English
Pages (from-to)	29454-29471
Number of pages	18
Journal	Optics Express
Volume	25
Issue number	23
DOIs	https://doi.org/10.1364/OE.25.029454
Publication status	Published - 13 Nov 2017
MoE publication type	A1 Journal article-refereed

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Zhao, G., Hausmaninger, T., Ma, W., & Axner, O. (2017). Differential noise-immune cavity-enhanced optical heterodyne molecular spectroscopy for improvement of the detection sensitivity by reduction of drifts from background signals. Optics Express, 25(23), 29454-29471. https://doi.org/10.1364/OE.25.029454

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abstract = "The detection sensitivity of noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) is often limited by background signals that bring in drifts. A novel realization of NICE-OHMS, termed differential NICE-OHMS, that both reduces such drifts and enlarges the molecular signal is presented. It is based on simultaneous detection of NICE-OHMS signals in reflection and transmission, followed by a subtraction of the former (properly weighted) from the latter. An Allan plot analysis shows that the instrumentation could demonstrate a noise equivalent absorption per unit length (NEAL) of 4.7 × 10−14 cm−1, obtained for an integration time of 170 s.",

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10.1364/OE.25.029454

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