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Knight, Jonathan
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article
Mid-infrared gas sensing using a photonic bandgap fiber
Abstract
<p>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 ppm (parts in 10 <sup>6</sup>) are reported. Operation down to 50ppm based on our current experiment is predicted. © 2008 Optical Society of America.</p>