Abstract
The 3.25 micron spectral region is very suitable for the in situ sensing of CH4 in the troposphere and the lower stratosphere with light-weight laser sensors. Several transitions of the strong fundamental ν 3 band of CH4 are revisited in this spectral region using an ultra-compact Difference-Frequency Generation (DFG) laser. Accurate intensities as well as self-broadening coefficients are reported for several manifolds that are particularly relevant to the monitoring of CH4. The study is extended to over hundred transitions reachable over the tunability range of the laser. Moreover, this DFG laser is the light source of a new, highly-compact CH4 laser spectrometer to be operated from weather balloon. The CH4 laser sensor is described and preliminary flight results are reported.
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Ghysels, M., Gomez, L., Cousin, J. et al. Spectroscopy of CH4 with a difference-frequency generation laser at 3.3 micron for atmospheric applications. Appl. Phys. B 104, 989–1000 (2011). https://doi.org/10.1007/s00340-011-4665-2
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DOI: https://doi.org/10.1007/s00340-011-4665-2