All-silica antiresonant hollow-core fiber-enhanced optical frequency comb Fourier transform spectroscopy of hydrocarbons in the mid-IR spectral band

In this work, we present an efficient detection of hydrocarbons, i.e. ethane (C2H6), and characterized by very broad absorption spectra pentane (C5H12) and butane (C4H10) within 2900 cm-1 to 3100 cm-1 wavelength band using a 26.15 m long, all-silica, self-fabricated antiresonant hollow-core fiber (ARHCF). The developed broadband gas sensor relies on the unique combination of the gas-filled ARHCF forming a low-volume, long and compact absorption cell and optical frequency comb Fourier transform spectroscopy technique. The sensor is characterized by a superb capability of retrieving broad molecular transitions with a detection capability greater than multipass cell-assisted and comb-based photoacoustic spectrometers.