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

Gang Zhao, Thomas Hausmaninger, Weiguang Ma, Ove Axner*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

17 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 languageEnglish
Pages (from-to)3109-3112
Number of pages4
JournalOptics Letters
Volume42
Issue number16
DOIs
Publication statusPublished - 15 Aug 2017
MoE publication typeA1 Journal article-refereed

Funding

Vetenskapsr?det (VR) (2015-04374); Kempestiftelserna (JCK 1317); National Natural Science Foundation of China (NSFC) (61675122); China Scholarship Council (CSC). The authors thank Ume? University?s program ?Strong Research Environments? for support. G. Zhao thanks the CSC for support.

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