Optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS) in a ring cavity

D. J. Hamilton, M. G. D. Nix, S. G. Baran, G. Hancock, A. J. Orr-Ewing

Research output: Contribution to journalArticle (Academic Journal)peer-review

25 Citations (Scopus)


Optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS) has been demonstrated by coupling a distributed feedback diode laser to a ring cavity. Frequency-selected light decaying from the ring cavity is retro-reflected, inducing a counter-propagating intra-cavity beam, and providing optical feedback to the laser. At specific laser-to-cavity distances, all cavity mode frequencies return to the diode laser with the same phase, allowing spectra to be accumulated across the range of frequencies of the current-tuned laser. OF-CEAS has been used to measure very weak oxygen isotopologue ((OO)-O-16-O-18 and (OO)-O-16-O-17) absorptions in ambient air at wavelengths near 762 nm using the electric-dipole forbidden O-2 A-band. A bandwidth reduced minimum detectable absorption coefficient of 2.2x10(-9) cm(-1) Hz(-1/2) is demonstrated.

Original languageEnglish
Pages (from-to)233-242
Number of pages10
JournalApplied Physics B
Issue number2
Publication statusPublished - Aug 2010


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