Optical feedback cavity-enhanced absorption spectroscopy (OF-CEAS) in a ring cavity
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...
| Main Authors: | , , , , |
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| Format: | Conference item |
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2010
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| Summary: | 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 ( 16O 18O and 16O 17O) 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 2.2 × 10 -9 cm -1 Hz -1/2 is demonstrated. © Springer-Verlag 2009. |
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