Abstract

We demonstrate methane sensing based on Fourier transform infrared spectroscopy using a hollow-core photonic bandgap fiber guiding in the mid-infrared and idler pulses from a femtosecond optical parametric oscillator. Transmission measurements are presented for several fibers, and sensing is demonstrated using a fiber whose bandgap overlaps the methane fundamental absorption lines. The gas filling process of the air core is described, and qualitative methane concentrations measurements to $1000\mathrm{ppm}$ (parts in ${10}^6$) are reported. Operation down to $50\mathrm{ppm}$ based on our current experiment is predicted.

© 2008 Optical Society of America

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