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 |
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Pages (from-to) | 3109-3112 |
Number of pages | 4 |
Journal | Optics Letters |
Volume | 42 |
Issue number | 16 |
DOIs | |
Publication status | Published - 15 Aug 2017 |
MoE publication type | A1 Journal article-refereed |