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16 September 2011 Precision spectroscopy with frequency combs at 3.4 μm
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Abstract
We discuss precision spectroscopy with a comb-based spectrometer at 3.4 μm. Our goal is to explore comb-based spectroscopy as an alternative method for fast, highly resolved, accurate measurements of gas line shapes. The spectrometer uses dual 1.5 μm frequency combs down converted to 3.4 μm via difference frequency generation (DFG) with a stabilized 1 μm fiber laser. One 3.4 μm comb is transmitted through methane and heterodyned against the second, offset comb to measure the gas absorption and dispersion. Doppler-broadened methane spectral lines are measured to below 1 MHz uncertainty. We also discuss the higher sensitivity alternative of a comb-assisted swept-laser DFG spectrometer.
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Esther Baumann, Fabrizio R. Giorgetta, William C. Swann, Alex M. Zolot, Ian Coddington, and Nathan R. Newbury "Precision spectroscopy with frequency combs at 3.4 μm", Proc. SPIE 8154, Infrared Remote Sensing and Instrumentation XIX, 81540B (16 September 2011); https://doi.org/10.1117/12.896692
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