Whispering-gallery-mode laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry

Gang Zhao; Thomas Hausmaninger; Weiguang Ma; Ove Axner

doi:10.1364/OL.42.003109

Whispering-gallery-mode laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry

Gang Zhao, Thomas Hausmaninger, Weiguang Ma, Ove Axner

Not published at VTT

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8 Citations (Scopus)

Abstract

The whispering-gallery-mode (WGM) laser is a type of laser that has an exceptionally narrow linewidth. Noise-immune cavity-enhanced optical heterodyne molecular spectrometry, which is a detection technique with extraordinary properties that benefit from narrow linewidth lasers, has been realized with a WGM laser. By locking to a cavity with a finesse of 55 000, acetylene and carbon dioxide could be simultaneously detected down to an unprecedented noise equivalent absorption per unit length of 6.6 × 10⁻¹⁴ cm⁻¹ over 150 s, corresponding to 5 ppt of C₂H₂.

Original language	English
Pages (from-to)	3109-3112
Number of pages	4
Journal	Optics Letters
Volume	42
Issue number	16
DOIs	https://doi.org/10.1364/OL.42.003109
Publication status	Published - 15 Aug 2017
MoE publication type	A1 Journal article-refereed

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Zhao, G., Hausmaninger, T., Ma, W., & Axner, O. (2017). Whispering-gallery-mode laser-based noise-immune cavity-enhanced optical heterodyne molecular spectrometry. Optics Letters, 42(16), 3109-3112. https://doi.org/10.1364/OL.42.003109

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abstract = "The whispering-gallery-mode (WGM) laser is a type of laser that has an exceptionally narrow linewidth. Noise-immune cavity-enhanced optical heterodyne molecular spectrometry, which is a detection technique with extraordinary properties that benefit from narrow linewidth lasers, has been realized with a WGM laser. By locking to a cavity with a finesse of 55 000, acetylene and carbon dioxide could be simultaneously detected down to an unprecedented noise equivalent absorption per unit length of 6.6 × 10−14 cm−1 over 150 s, corresponding to 5 ppt of C2H2.",

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10.1364/OL.42.003109

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