Near-infrared broad-band cavity enhanced absorption spectroscopy using a superluminescent light emitting diode

W. Denzer, M. L. Hamilton, G. Hancock, Meez Islam, C. E. Langley, R. Peverall, G. A.D. Ritchie

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

A fibre coupled near-infrared superluminescent light emitting diode that emits ∼10 mW of radiation between 1.62 and 1.7 m 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.

Original languageEnglish
Pages (from-to)2220-2223
Number of pages4
JournalAnalyst
Volume134
Issue number11
DOIs
Publication statusPublished - 29 Dec 2009

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