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Communication
Analyst, 2009, 134, 2220 - 2223, DOI: 10.1039/b916807a
Near-infrared broad-band cavity enhanced absorption spectroscopy using a superluminescent light emitting diode
W. Denzer, M. L. Hamilton, G. Hancock, M. Islam, C. E. Langley, R. Peverall and G. A. D. Ritchie
A fibre coupled near-infrared superluminescent light emitting diode that emits
10 mW of radiation between 1.62 and 1.7 µm is employed in combination with a broad-band cavity enhanced spectrometer consisting of a linear optical cavity with mirrors of reflectivity 99.98% and either a dispersive near-infrared spectrometer or a Fourier transform interferometer. Results are presented on the absorption of 1,3-butadiene, and sensitivities are achieved of 6.1 × 10-8 cm-1 using the dispersive spectrometer in combination with phase-sensitive detection, and 1.5 × 10-8 cm-1 using the Fourier transform interferometer (expressed as a minimum detectable absorption coefficient) over several minutes of acquisition time.
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