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

Gang Zhao, Thomas Hausmaninger, Weiguang Ma, Ove Axner

Research output: Contribution to journalArticleScientificpeer-review

8 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−12, 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 languageEnglish
Pages (from-to)715-718
Number of pages4
JournalOptics Letters
Volume43
Issue number4
DOIs
Publication statusPublished - 1 Feb 2018
MoE publication typeA1 Journal article-refereed

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