Mid-infrared dual frequency comb spectroscopy based on fiber lasers for the detection of methane in ambient air
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2015 Astro Ltd. We utilize mid-infrared dual frequency comb spectroscopy for the detection of methane in ambient air. Two mid-infrared frequency comb sources based on femtosecond Er:fiber oscillators are produced through difference frequency generation with periodically poled MgO-doped lithium niobate crystals and stabilized at slightly different repetition rates at about 250 MHz. We performed dual frequency comb spectroscopy in the spectral range between 2900 cm-1and 3150 cm-1with 0.07 cm-1resolution using a multipass cell of 580 m path length, and achieved the sensitivity about 7.6 10-7cm-1with 80 ms data acquisition time. We determined the methane concentration as 1.5 ppmv in the ambient air of the laboratory, and the detection limit as 60 ppbv for the current setup.
author list (cited authors)
Zhu, F., Bicer, A., Askar, R., Bounds, J., Kolomenskii, A. A., Kelessides, V., Amani, M., & Schuessler, H. A.
complete list of authors
Zhu, F||Bicer, A||Askar, R||Bounds, J||Kolomenskii, AA||Kelessides, V||Amani, M||Schuessler, HA