Shot-noise-limited doppler-broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry

Gang Zhao; Thomas Hausmaninger; Weiguang Ma; Ove Axner

doi:10.1364/OL.43.000715

Shot-noise-limited doppler-broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry

Gang Zhao, Thomas Hausmaninger, Weiguang Ma, Ove Axner

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15 Citations (Scopus)

Abstract

Shot-noise-limited Doppler-broadened (Db) noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) has been realized by implementation of balanced detection. A characterization of the system based on Allan–Werle plots of the absorption coefficient, retrieved by fitting a model function to data, shows that the system has a white noise equivalent absorption per unit length per square root of bandwidth of 2.3 × 10−¹³ cm⁻¹ Hz⁻¹∕², solely 44% above the shot noise limit, and a detection sensitivity of 2.2 × 10⁻¹⁴ cm⁻¹ over 200 s, both being unprecedented for Db NICE-OHMS. The white noise response follows the expected inverse square root dependence on power that is representative of a shot-noise-limited response, which confirms that the system is shot-noise-limited.

Original language	English
Pages (from-to)	715-718
Number of pages	4
Journal	Optics Letters
Volume	43
Issue number	4
DOIs	https://doi.org/10.1364/OL.43.000715
Publication status	Published - 1 Feb 2018
MoE publication type	A1 Journal article-refereed

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abstract = "Shot-noise-limited Doppler-broadened (Db) noise-immune cavity-enhanced optical heterodyne molecular spectrometry (NICE-OHMS) has been realized by implementation of balanced detection. A characterization of the system based on Allan–Werle plots of the absorption coefficient, retrieved by fitting a model function to data, shows that the system has a white noise equivalent absorption per unit length per square root of bandwidth of 2.3 × 10−13 cm−1 Hz−1∕2, solely 44% above the shot noise limit, and a detection sensitivity of 2.2 × 10−14 cm−1 over 200 s, both being unprecedented for Db NICE-OHMS. The white noise response follows the expected inverse square root dependence on power that is representative of a shot-noise-limited response, which confirms that the system is shot-noise-limited.",

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AU - Hausmaninger, Thomas

AU - Ma, Weiguang

AU - Axner, Ove

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Shot-noise-limited doppler-broadened noise-immune cavity-enhanced optical heterodyne molecular spectrometry

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